A high waterproof aluminum-magnesium-manganese upright lock edge roof node sealing construction method

Abstract

The application relates to the technical field of building roof waterproof construction, and discloses a high-waterproof aluminum-magnesium-manganese standing seam roof node sealing construction method. The construction steps comprise the following steps: firstly, a node hole is formed on a roof panel around a roof member, and a continuous closed water retaining vertical edge is formed on the edge of the hole; then, a lower sliding flashing element is buckled outside the water retaining vertical edge, a horizontal sliding gap is reserved, and non-solidified butyl sealing material is filled in the gap; subsequently, an upper fixed flashing sleeve is positioned and fixed, the outer skirt of the upper fixed flashing sleeve is controlled to cover the lower sliding flashing element downwards, so that a labyrinth type shielding cavity with a staggered drainage structure is constructed; finally, a backing rod is filled in a joint under pressure, and weather-resistant silicone sealant is injected to close the joint. The construction method effectively releases the thermal displacement stress of the roof panel through specific sliding gap reservation and multi-stage covering procedures, and cuts off the reverse rainwater reverse inflow path in the process, so that the long-term waterproof reliability of the node is improved.

Description

Technical Field

[0001] This invention relates to the field of building roof waterproofing construction technology, specifically a method for sealing joints in high-waterproof aluminum-magnesium-manganese standing seam roofs. Background Technology

[0002] Aluminum-magnesium-manganese standing seam roofing systems are widely used due to their suitability for large-span buildings and good overall waterproofing performance. However, in actual engineering projects, due to the large coefficient of thermal expansion of metallic materials, long-span roof panels will experience significant thermal expansion and contraction displacement under the influence of environmental temperature differences. At the same time, the roof penetration components are usually directly fixed to the main building structure and are relatively stationary, resulting in significant relative misalignment between the two at the joints.

[0003] Existing roof joint sealing methods typically involve using rigid flashing to mechanically fix the roof penetration components directly to the roof panels, followed by applying sealant directly to the joints. This conventional method fails to allow for sliding and clearance between components during the construction process. As a result, the dynamic thermal displacement of the roof panels is forcibly restricted after construction, directly translating into shear stress at the sealing interface. Under long-term temperature fluctuations, this direct-bonding method keeps the sealant in a state of tension and shear for extended periods, leading to fatigue cracking of the sealant joints. Furthermore, when dealing with complex climatic conditions, traditional construction procedures often rely solely on simple panel overlaps for physical shielding, lacking steps to address pressure balance. Under alternating wind pressure, a pressure difference easily arises between the inside and outside of the constructed joint. Driven by this pressure difference and capillary action at the panel gaps, rainwater can easily rise and backflow along the construction overlap joints. Because existing construction methods fail to address the issues of dynamic displacement release and internal pressure balance in the process steps, the long-term waterproofing effect of roof joints under complex conditions cannot be guaranteed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a high-waterproof aluminum-magnesium-manganese standing seam roof joint sealing construction method. The technical problem it solves is that traditional standing seam roof joints are prone to shear stress concentration due to the rigid constraints between components when cyclic thermal displacement occurs due to temperature changes, leading to fatigue cracking of the sealant joint. In addition, under dynamic wind pressure, there is a pressure difference between the inside and outside of the traditional sealing structure, and moisture is prone to reverse climbing and backflow under the pressure difference and capillary action, causing joint leakage.

[0005] To address the above problems, the present invention provides the following technical solution: The first aspect of this invention provides a method for sealing joints in a highly waterproof aluminum-magnesium-manganese standing seam roof, comprising the following steps: Node holes are made on the aluminum-magnesium-manganese standing seam roof panel around the roof component, with the size of the node holes being larger than the outer contour size of the roof component and leaving clearance space, and a continuous closed water-blocking edge is formed around the node holes. The lower sliding flashing is fastened to the outside of the water-blocking vertical edge. A lateral sliding gap is reserved between the lower sliding flashing and the water-blocking vertical edge. Non-curing butyl sealant is filled into the lateral sliding gap so that the non-curing butyl sealant is located in the closed or semi-closed sliding sealing cavity. The upper fixed flashing sleeve is fitted onto the outside of the roof penetration component and positioned, fixed and sealed to the roof penetration component. The outer skirt of the upper fixed flashing sleeve extends downward and covers the outside of the lower sliding flashing component, forming a labyrinth-like shielding cavity. A joint seam is formed between the lower end of the outer skirt of the upper fixed flashing sleeve and the lower sliding flashing component. The labyrinth-like shielding cavity is connected to the outside through a concealed drainage seam, drainage hole or drip edge that is offset from the sealant seam subsequently formed in the joint seam. Polyethylene foam backing rods are filled into the joint, and weather-resistant silicone sealant with elastic displacement compensation capability is injected on top of the polyethylene foam backing rods, so that the weather-resistant silicone sealant forms a two-sided bonding structure.

[0006] Furthermore, in the step of forming a continuous closed water-retaining vertical edge around the node hole: a prefabricated circumferential closed flange reinforcement component adapted to the shape of the node hole is installed around the node hole to form a continuous closed water-retaining vertical edge; or when on-site cold bending conditions are available, the edge of the node hole is folded upwards using a progressive flange method to form a continuous closed water-retaining vertical edge without setting through fasteners on the effective waterproof surface of the roof panel. During construction, the final forming height of the water-retaining vertical edge is determined based on the drainage conditions, design water accumulation height, risk of wind and rain backflow, and construction safety margin at the location of the roof node. The final forming height of the water-retaining vertical edge is not less than the sum of the maximum water accumulation height around the roof node under the design conditions and the safety margins for surge protection, water creep prevention, and construction deviation.

[0007] Furthermore, after filling the lateral sliding gap with non-cured butyl sealant, the method further includes the following steps: setting elastic limiting clips at intervals around the perimeter of the water-blocking vertical edge; making one end of the elastic limiting clips press against the upper part or top edge of the water-blocking vertical edge, and making the other end of the elastic limiting clips press against the limiting edge, barb edge, or pressing edge of the lower sliding flashing component. The elastic restoring force of the elastic limiting clip is used to apply a limiting pre-tightening force to the lower sliding flashing. This restricts the lower sliding flashing from detaching from the water-blocking edge in the vertical direction, while allowing restricted relative sliding between the water-blocking edge and the lower sliding flashing in the horizontal direction. This prevents the thermal displacement of the roof panel from being rigidly transmitted to the roof penetration components through the elastic limiting clip.

[0008] Furthermore, before forming the labyrinthine shielding cavity, the following steps are also included: prefabricating a corrugated flexible breathing belt composed of a weather-resistant elastic corrugated belt and a waterproof and breathable membrane; setting breathable holes on the wall surface of the weather-resistant elastic corrugated belt, and bonding a waterproof and breathable membrane at the breathable holes. The lower edge of the corrugated flexible breathing tape with a waterproof and breathable membrane is attached to the top of the inner wall of the lower sliding flashing component, and the lower edge of the corrugated flexible breathing tape is fixed to the metal wall of the lower sliding flashing component by pressure strips, sealing gaskets and fasteners. After fixing the lower edge of the corrugated flexible breathing belt, pull the entire corrugated flexible breathing belt inward, keeping the upper edge of the corrugated flexible breathing belt suspended upward, and placing the entire corrugated flexible breathing belt in the high-level water-avoiding area within the shielding range of the upper fixed flood sleeve. The corrugated flexible breathing belt is installed in a non-tensioned state or with reserved fold deformation margin. When relative misalignment occurs at the nodes, displacement is absorbed preferentially through fold unfolding, compression, or deflection.

[0009] Furthermore, after the upper fixed flashing sleeve is fitted onto the outside of the roof penetration component, the following steps are also included: the upper edge of the corrugated flexible breathing strip is fixed to the upper part of the inner wall of the upper fixed flashing sleeve by means of pressure strip, sealing gasket and fastener; after fixing the upper edge of the corrugated flexible breathing strip, the corrugated flexible breathing strip, the inner wall of the upper fixed flashing sleeve and the inner wall of the lower sliding flashing component are together enclosed to form an internal concealed pressure relief cavity; During construction, the boundaries of the internal concealed pressure-relief cavity, except for the waterproof and breathable membrane, should be sealed. The internal concealed pressure-relief cavity and the labyrinth-style shielded cavity should be connected by a controlled airflow through the waterproof and breathable membrane. This will help to release the pressure difference between the labyrinth-style shielded cavity and the internal concealed pressure-relief cavity and prevent liquid water from entering the internal concealed pressure-relief cavity.

[0010] Furthermore, in the step of extending the outer skirt of the upper fixed flashing sleeve downwards and covering the outer side of the lower sliding flashing: the vertical overlap and shielding depth between the outer skirt of the upper fixed flashing sleeve and the lower sliding flashing is measured and controlled; the vertical overlap and shielding depth is determined according to the roof slope, design wind pressure, rainwater scouring direction, water accumulation height and construction safety margin at the node. The vertical overlap shielding depth should be no less than the sum of the capillary rise height of liquid water in the gap, the reverse rise height of rainwater under the action of design wind pressure, the surge prevention, backflow prevention and construction deviation safety margin; by controlling the vertical overlap shielding depth, the reverse rise path of liquid water under capillary action and strong wind pressure is extended.

[0011] Furthermore, the process of forming the labyrinthine shielding cavity also includes the following steps: setting a local drainage gap at the lower end of the outer skirt of the upper fixed flashing sleeve; A downward-folding water-blocking edge is formed inside the local drainage gap; a drip edge is formed on the outer wall of the lower sliding flashing; during construction, the local drainage gap is made to avoid the continuous closed area of ​​the joint sealant, or the local drainage gap is made to be located radially outside, below or laterally folded within the drainage area of ​​the joint sealant. By using the downward-folding water-blocking and dripping edges, the small amount of water entering the labyrinthine shielded cavity is blocked, and the water is guided to drain out radially through a non-straight path.

[0012] Furthermore, in the step of filling the joint with polyethylene foam backing rods and injecting weather-resistant silicone sealant with elastic displacement compensation capability above the polyethylene foam backing rods: the polyethylene foam backing rods are selected according to the actual width of the joint, so that the natural diameter of the polyethylene foam backing rods is 1.2 to 1.5 times the actual width of the joint. The polyethylene foam backing rod is pressed into the joint, so that the polyethylene foam backing rod is pressed against the metal wall on both sides of the joint through elastic restoring force, and provides a bottom support surface for subsequent glue injection; the polyethylene foam backing rod is used to control the injection thickness of weather-resistant silicone sealant and prevent the weather-resistant silicone sealant from bonding to the bottom of the joint, thereby avoiding the formation of three-sided adhesion. After injecting the weather-resistant silicone sealant, the surface of the sealant is compacted and trimmed along the joint to form a continuous, full, and slightly concave cross-sectional shape. The central area of ​​the sealant is also relatively thinned to facilitate elastic stretching, compression, or shear deformation through the sealant when the metal components on both sides undergo relative displacement.

[0013] Furthermore, in the step of injecting weather-resistant silicone sealant with elastic displacement compensation capability: the center injection thickness of the weather-resistant silicone sealant is determined according to the material displacement grade of the weather-resistant silicone sealant, the joint width, and the relative displacement of the node design. The center injection thickness of the weather-resistant silicone sealant should match the width of the joint, and the center injection thickness of the weather-resistant silicone sealant should be 0.5 to 1.0 times the width of the joint. A weather-resistant silicone sealant with a displacement capacity not less than the maximum design relative displacement between the upper fixed flashing sleeve and the lower sliding flashing component should be selected, so that the sealant joint can be compensated by elastic deformation within the design displacement range, without rigidly fixing the upper fixed flashing sleeve and the lower sliding flashing component.

[0014] Furthermore, when the roof-penetrating component is a linear roof-penetrating component extending along the roof, the following steps are included: continuously setting linear water-retaining vertical edges along the length direction of the linear roof-penetrating component; fastening a long strip-shaped sliding flashing plate to the outside of the linear water-retaining vertical edges; A sliding gap is reserved between the linear water-retaining vertical edge and the long strip sliding flashing; the sliding gap is filled with non-curing butyl sealant; the linear long strip fixed flashing cap, which serves as the upper fixed flashing sleeve, is fixedly connected to the linear through-roof component, and the long strip fixed flashing cap is overlapped downwards and covered on the outside of the long strip sliding flashing, thereby forming a linear labyrinthine shielding cavity; Intermittent concealed drainage seams, drainage holes, or drip edges are provided at the bottom of the linear labyrinth-type concealed cavity; end plugs, folding water-blocking parts, or end seals are provided at the ends of the linear labyrinth-type concealed cavity along its length to prevent the formation of a straight seepage path at the ends of the linear labyrinth-type concealed cavity along its length.

[0015] This invention provides a method for sealing joints in high-waterproof aluminum-magnesium-manganese standing seam roofs. It offers the following advantages: 1. This solution changes the traditional method of directly rigidly connecting flashing components by reserving a lateral sliding gap between the lower sliding flashing component and the water-retaining vertical edge during the flashing installation process and filling it with non-curing butyl sealant. This construction method creates a restricted sliding pair at the joint, allowing the finished metal roof panel to absorb thermal displacement through relative sliding between components, cutting off the path of displacement stress rigidly transmitted to the main sealant joint, thereby preventing fatigue cracking of the joint due to temperature cycle stress concentration.

[0016] 2. This invention, during the construction steps of waterproofing and shielding the nodes, controls the outer skirt of the upper fixed flashing sleeve to cover the lower sliding flashing component downwards, forming a labyrinthine shielding cavity, and combines this with a corrugated flexible breathing belt to construct an internal concealed pressure-relieving cavity. This construction method allows the node to achieve controlled air communication between the inside and outside through a breathable membrane after it is formed, balancing the internal and external air pressure difference under alternating wind pressure conditions in real time, eliminating the pressure difference dynamics of rainwater backflow; combined with the construction process of staggered arrangement of drainage structures, it effectively blocks the reverse rise of liquid water under wind pressure and capillary action from a technological perspective.

[0017] 3. This invention, during the joint sealing construction stage, uses a polyethylene foam backing rod with a suitable size for pressure filling as the injection support surface, physically isolating the weather-resistant silicone sealant from the bottom of the joint. This construction method effectively avoids the three-sided adhesion defect that easily occurs in conventional sealant application, ensuring that the sealant only forms a two-sided bond with the two metal wall surfaces. Combined with the subsequent compaction and trimming process to form a micro-concave cross-section, this ensures that the formed sealant deforms more uniformly when dealing with multi-dimensional displacement, reducing the risk of interface peeling and improving the long-term reliability of the joint sealing construction. Attached Figure Description

[0018] Figure 1 This is an overall flowchart of the construction method of the present invention; Figure 2 This is a schematic diagram of the construction process for the node opening and water-retaining vertical edge of the present invention; Figure 3 This is a schematic diagram of the installation process of the lower sliding flashing component and the limiting clip of the present invention; Figure 4 This is a schematic diagram of the prefabrication and lower end fixing process of the corrugated flexible breathing belt of the present invention; Figure 5 This is a schematic diagram of the process for installing the upper fixed flashing sleeve and forming the shielding cavity according to the present invention. Figure 6 This is a schematic diagram of the construction process for filling and sealing the joint backing of the present invention; Figure 7 This is a comparison curve of the peak shear stress of the embodiment of the present invention and the conventional solution under thermal displacement cycle. Figure 8 This is a bar chart comparing the seepage volume of the embodiments of the present invention and the traditional solution under alternating wind pressure levels. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This embodiment relates to a roof joint sealing structure formed by a high-waterproof aluminum-magnesium-manganese standing seam roof joint sealing construction method. The roof joint sealing structure includes a through-roof component, an aluminum-magnesium-manganese standing seam roof panel, a water-retaining vertical edge, a lower sliding flashing, an upper fixed flashing sleeve, a non-curing sealing layer, and an elastic weather-resistant silicone sealant. Depending on the joint size, wind load conditions, or deformation compensation requirements, elastic limiting clips, corrugated flexible breathing strips, and waterproof breathable membranes may also be added.

[0021] The roof penetration components are fixed to the main building structure or the roof base structure, serving as static fixed parts in the roof joints. The aluminum-magnesium-manganese (AMC) standing seam roof panels are arranged around the perimeter of the roof penetration components and are subject to thermal expansion and contraction due to temperature changes, serving as dynamic parts that can move relative to the roof penetration components. A radial clearance is reserved between the AMC standing seam roof panels and the roof penetration components. The design value of the radial clearance on one side is not less than the sum of the maximum design thermal displacement of the roof panel relative to the roof penetration components, construction and installation deviations, and safety margins.

[0022] A water-retaining vertical edge is positioned around the opening at the roof panel node to form a continuous water-retaining boundary. The lower sliding flashing is fastened to the outside of the water-retaining vertical edge, forming a lateral sliding gap between them. The non-curing sealant layer is formed of non-curing butyl sealant, which fills the lateral sliding gap and is located within a closed or semi-closed sliding seal cavity defined by the water-retaining vertical edge, the lower sliding flashing, and the flow-stopping fold, limiting edge, barbed edge, or closed boundary. This allows the sealant to deform dynamically when the roof panel undergoes reciprocating thermal displacement, maintaining a continuous waterproof seal at the sliding interface.

[0023] The upper fixed flashing sleeve is fixedly connected to the roof penetration component and overlaps downwards to shield the lower sliding flashing component, forming a labyrinthine shielding cavity around the roof penetration component. Elastic weather-resistant silicone sealant is applied at the joint between the upper fixed flashing sleeve and the lower sliding flashing component to seal off any direct infiltration path of liquid water. The labyrinthine shielding cavity communicates with the outside through concealed drainage seams, drainage holes, drip edges, or drainage-ventilation composite channels. These concealed drainage or ventilation paths are staggered from the joint sealant seams to allow small amounts of splashing water, condensate, or rainwater entering the cavity to drain through non-direct paths, preventing the formation of a direct liquid water channel.

[0024] The lower sliding flashing is located between the dynamic roof panel side and the static through-roof component side, serving as an intermediate component for releasing thermal displacement of the roof panel and for waterproofing transition at joints. The lower sliding flashing is neither rigidly fixed to the through-roof component nor rigidly locked to the water-retaining vertical edge. It allows limited horizontal sliding relative to the water-retaining vertical edge and elastic relative displacement relative to the upper fixed flashing sleeve. Thermal displacement of the roof panel is preferentially released within the lateral sliding gap between the water-retaining vertical edge and the lower sliding flashing. Residual minor displacement is absorbed by the non-curing butyl sealant, the weather-resistant silicone sealant at the joint, and the elastic limiting clips and corrugated flexible breathable strip used during installation, thus preventing direct transmission of thermal displacement of the roof panel to the through-roof component.

[0025] In the preferred embodiment where a corrugated flexible breathing strip and a waterproof and breathable membrane are provided, the corrugated flexible breathing strip is disposed between the lower sliding flashing and the upper fixed flashing sleeve, and together with the inner wall of the upper fixed flashing sleeve and the inner wall of the lower sliding flashing, forms an internal concealed pressure-relieving cavity. The internal concealed pressure-relieving cavity is connected to the labyrinthine shielding cavity through the waterproof and breathable membrane to form a controlled gas phase, thereby mitigating the pressure difference in the cavity caused by wind pressure changes and preventing liquid water from entering the internal concealed pressure-relieving cavity. When the corrugated flexible breathing strip and the waterproof and breathable membrane are not provided, the node can still achieve waterproofing and displacement compensation through the lower sliding flashing, the upper fixed flashing sleeve, the labyrinthine shielding cavity, the concealed drainage structure, and the elastic sealant at the joint.

[0026] For linear nodes such as parapet flashing, this method can be used to form linear water-retaining vertical edges, sliding flashing components, and labyrinthine shielding structures. In linear nodes, the water-retaining vertical edges are continuously installed along the length of the parapet wall or linear protruding component; the lower sliding flashing component is a long strip-shaped sliding flashing plate; the upper fixed flashing sleeve is replaced by a long strip-shaped fixed flashing cap that is fixedly connected to the parapet wall or linear protruding component. The long strip-shaped fixed flashing cap overlaps downwards to shield the lower sliding flashing component and forms a linear labyrinthine shielding cavity. The bottom of the cavity is provided with intermittent concealed drainage seams, drainage holes, or drip edges. The ends of the linear node are provided with end seals, folding water-retaining components, or end seals to prevent the formation of a straight seepage path at the end.

[0027] When the roof penetration component is a linear protruding component, a continuous linear water-retaining vertical edge is installed along the length of the linear protruding component. A long strip-shaped sliding flashing is fastened to the outside of the linear water-retaining vertical edge, and a sliding gap is reserved between the linear water-retaining vertical edge and the long strip-shaped sliding flashing. The sliding gap is filled with non-curing butyl sealant. The long strip-shaped fixed flashing cap is a linear form of the upper fixed flashing sleeve. The long strip-shaped fixed flashing cap is fixedly connected to the linear roof penetration component and overlaps downwards and covers the outside of the long strip-shaped sliding flashing, thereby forming a linear labyrinth-type concealed cavity. Intermittent concealed drainage seams, drainage holes, or drip edges are set at the bottom of the linear labyrinth-type concealed cavity. End sealing parts, folding water-retaining parts, or end seals are set at the ends of the linear labyrinth-type concealed cavity along its length to prevent the formation of a straight seepage path at the ends of the linear labyrinth-type concealed cavity along its length.

[0028] Reference Figure 1 The construction method includes the following steps: S101 involves the positioning, opening, and construction of the roof penetration node and water-retaining vertical edge. The node location is determined based on the detailed design coordinates, and node holes are made on the aluminum-magnesium-manganese standing seam roof panel. The size of the node hole is larger than the outer contour dimension of the roof penetration component, and sufficient space is reserved to accommodate thermal displacement, installation deviation, and safety margin of the roof panel.

[0029] Prefabricated circumferential closed flange reinforcements that match the shape of the node holes are preferably installed around the perimeter to form a continuous closed water-retaining edge. When on-site cold bending conditions are available, the edges of the roof panel holes can also be folded upwards to form a water-retaining edge. When on-site cold bending poses risks of coating damage, panel deformation, wrinkling, or cracking, prefabricated flange reinforcements are used to form a water-retaining edge, creating a continuous closed waterproof connection interface between it and the edges of the roof panel holes.

[0030] S102, Installation and sliding seal construction of the lower sliding flashing: The lower sliding flashing is fastened to the outside of the water-retaining vertical edge, and a lateral sliding gap is reserved between the two; non-curing butyl sealant is filled in the lateral sliding gap, so that the lower sliding flashing can slide horizontally relative to the water-retaining vertical edge and maintain a waterproof seal; if necessary, elastic limiting clips are set around the perimeter of the water-retaining vertical edge, and a low-friction isolation layer is set on the sliding contact surface to form a sliding seal structure that combines vertical limiting and horizontal sliding guidance.

[0031] S103, Optional installation of the flexible pressure-relieving component: When further release of node misalignment deformation or relief of cavity pressure difference is required, a prefabricated corrugated flexible breathing belt composed of weather-resistant elastic corrugated belt and waterproof breathable membrane is constructed. When the corrugated flexible breathing belt and waterproof breathable membrane are not installed, the content regarding the fixing of the corrugated flexible breathing belt in steps S103 and S1042 is omitted. The upper fixed flashing sleeve still forms a labyrinthine shielding cavity with the lower sliding flashing component, and drainage is achieved through concealed drainage seams, drainage holes, or drip edges.

[0032] The lower edge of the corrugated flexible breathing belt is fixed to the top of the inner wall of the lower sliding flashing component using pressure strips, sealing gaskets, and fasteners, temporarily keeping its upper edge suspended and positioning the entire belt within the high-level water-avoiding area shielded by the upper fixed flashing sleeve. The corrugated flexible breathing belt is installed in a non-tensioned state or with pre-reserved fold deformation allowance, so that it preferentially absorbs displacement through fold unfolding, compression, or deflection when relative misalignment occurs at the nodes.

[0033] S104, the upper fixed flashing sleeve is installed in conjunction with the labyrinthine shielding structure. The upper fixed flashing sleeve is fitted over the roof penetration component, and its upper end is positioned, fixed, and sealed to the roof penetration component. When a corrugated flexible breathing strip is installed, its suspended upper edge is fixed to the upper inner wall of the upper fixed flashing sleeve using pressure strips, sealing gaskets, and fasteners. The outer skirt of the upper fixed flashing sleeve extends downwards and covers the outside of the lower sliding flashing component, thus forming an overlapping labyrinthine shielding cavity; when a corrugated flexible breathing strip is installed, an internal concealed pressure-reducing cavity can also be formed.

[0034] S105, double-sided bonding and sealing construction of the joint: Polyethylene foam backing rods are filled into the circumferential closed joint formed by the lower end of the outer skirt of the upper fixed flashing sleeve and the area adjacent to the lower sliding flashing component, maintaining the backing rods in a moderately elastically compressed state. Weather-resistant silicone sealant with elastic displacement compensation capability is injected above the backing rods. Utilizing the non-adhesive properties of the backing rod surface, the silicone sealant forms a two-sided bonding structure only with the opposite sidewalls of the upper fixed flashing sleeve and the lower sliding flashing component, avoiding three-sided bonding constraints.

[0035] The joint sealant continuously seals off any direct path of liquid water infiltration. Concealed drainage joints, drain holes, drip edges, or drainage-ventilation composite grooves are staggered with the sealant joints, allowing small amounts of water within the labyrinthine concealed cavity to drain through non-direct paths and preventing the formation of direct seepage paths.

[0036] Reference Figure 2 Step S101 includes the following specific processes: S1011, perform node positioning and opening size calibration. Technicians review the coordinates of the civil engineering structure, roof layout, and MEP installation drawings to determine the center point of the projection of the through-roof component onto the surface of the aluminum-magnesium-manganese standing seam roof panel. Using this center point as a reference, mark the boundary of the node openings on the surface of the aluminum-magnesium-manganese standing seam roof panel. The node opening dimensions are determined based on the outer contour dimensions of the through-roof component, the maximum design thermal displacement of the roof panel, installation deviations, and safety margins.

[0037] The maximum design thermal displacement of the roof panel is determined based on the linear expansion characteristics of the aluminum-magnesium-manganese sheet, the effective length from the roof panel fixing point to the node location, and the design temperature difference at the project site. Sufficient clearance should be provided between the edge of the node opening and the outer wall of the roof penetration component to accommodate the thermal expansion and contraction displacement of the roof panel. This clearance includes construction and assembly errors, alignment errors, and residual safety gaps under extreme displacement conditions.

[0038] S1012 involves low-damage hole opening and edge treatment. Cold cutting, low-heat-input cutting, hole sawing, jigsaw, or specialized hole-opening tools are used to cut along the marked hole boundaries, creating node holes in the aluminum-magnesium-manganese standing seam roofing panel. Large impact equipment should be avoided during the hole opening process to reduce the risk of panel deformation, coating damage, and cut cracks.

[0039] After the hole is drilled, the cut edges are trimmed, polished, cleaned, and sealed to remove burrs and stress concentration points, making the cut section flat and smooth, and reducing the risk of water leakage or tearing at the subsequent sealing joint.

[0040] S1013, construct the water-retaining vertical edge. The opening should preferably be located within the flat area between adjacent vertical seams. When the node location unavoidably crosses a vertical seam, plate rib, or local reinforcing rib, first install a transitional flat base or local reinforcing plate in that area to ensure a continuous and reliable installation foundation for the water-retaining vertical edge.

[0041] Prefabricated circumferential closed flange reinforcements, adapted to the shape of the node holes, are preferably installed around the cut edge to form an upward continuous water-blocking vertical edge. Using prefabricated flange reinforcements can reduce the adverse effects of large-angle cold bending on the coating, surface flatness, and cut edge of the aluminum-magnesium-manganese sheet.

[0042] When the conditions for cold bending on site are met, i.e. the radius of curvature of the hole, the thickness of the board, the extensibility of the coating, and the on-site construction space meet the requirements for edge forming, the edge of the node hole can also be folded upward by a progressive edge forming method, forming a continuous closed water-blocking edge without setting through fasteners on the effective waterproof surface of the roof panel.

[0043] When the design height of the water-retaining vertical edge is large, the radius of the hole is small, or the thickness of the board or site conditions may lead to the risk of wrinkling, cracking, or coating damage at the root of the flange, prefabricated flange reinforcement components are used to form the water-retaining vertical edge. The prefabricated flange reinforcement components are fixed to the edge of the hole in the roof panel through a non-penetrating clamping, interlocking, or pressing structure, and together with butyl sealing tape, sealant, or other flexible sealing materials, a continuous closed waterproof connection interface is formed, without forming a through-hole fastening hole on the effective waterproof surface of the roof panel.

[0044] In a preferred embodiment, the prefabricated flange reinforcement includes a vertical water-blocking cylinder, a horizontal pressing edge located at the lower end of the vertical water-blocking cylinder, and a clamping back plate located below the roof panel. A butyl sealing strip is sandwiched between the horizontal pressing edge and the upper surface of the roof panel. The clamping back plate and the horizontal pressing edge together clamp the edge of the hole in the roof panel, allowing the prefabricated flange reinforcement to form a continuous, closed water-blocking vertical edge without penetrating the effective waterproof surface of the roof panel. The clamping back plate can be an integral structure or a segmented structure; when the operating space below the roof panel is limited, the segmented clamping back plate is inserted under the roof panel from the node hole and then assembled, clamping the edge of the hole in the roof panel together with the horizontal pressing edge.

[0045] When fasteners are used to apply clamping force to the horizontal crimped edges and the clamping back panel, the fasteners are positioned within the shielding area of ​​the water-retaining vertical edge or subsequent flashing structure, and do not form a through-seepage path from the external roof water surface to the roof structural layer on the effective waterproof surface of the aluminum-magnesium-manganese standing seam roof panel. Adhesive sealant is primarily used for interface waterproofing and is not used as the sole fixing structure for prefabricated flange reinforcements to withstand wind loads or thermal displacement of the roof panel.

[0046] When on-site cold bending and flanging cannot be continuously formed, prefabricated flanging reinforcements replace the water-blocking vertical edges formed by on-site folding, and together with the lower sliding flashing, non-curing butyl sealant and elastic limiting clips, they form a displacement-release type waterproof transition structure.

[0047] S1014, Water-retaining vertical edge height control and measurement verification. The final forming height of the water-retaining vertical edge is set as follows: , The determination is based on the drainage conditions, design water accumulation height, risk of wind and rain backflow at the location of the roof node, and construction safety margin, and must meet the following requirements: ; In the formula, The design height of the water-retaining vertical edge is given in meters (m). The maximum water accumulation height around the roof node under design conditions, in meters; The unit is meters (m) to provide safety margins for surge protection, creepage prevention, and construction deviation.

[0048] In one implementation, Not less than 0.05m. Through the above height control, the water-retaining vertical edge still has the necessary water-retaining height under conditions of heavy rainfall, short-term water accumulation, or strong winds and rain, so as to reduce the risk of rainwater crossing the edge of the node opening and entering the roof structural layer.

[0049] Reference Figure 3 Step S102 includes the following specific processes: S1021, Lateral sliding gap reservation and approval. The prefabricated lower sliding flashing is fastened to the outside of the water-retaining vertical edge. The lower part of the lower sliding flashing may be provided with an inwardly or downwardly bent limiting edge, a barbed edge, or a press-fit edge to cooperate with the water-retaining vertical edge to form vertical limiting and sliding guidance.

[0050] During assembly, a lateral sliding gap is formed between the inner wall of the lower sliding flashing and the outer wall of the water-retaining vertical edge. The width of this lateral sliding gap on one side is not less than the sum of the maximum design thermal displacement of the roof panel, construction assembly error, alignment error, and safety margin. The maximum design thermal displacement can be determined based on the linear expansion characteristics of the aluminum-magnesium-manganese sheet, the effective length from the roof panel fixing point to the node position, and the design temperature difference at the project site. During construction, the lower sliding flashing is aligned and checked using measuring tools to ensure that the lateral sliding gap formed by the actual assembly meets the requirements for thermal expansion and contraction displacement release of the roof panel.

[0051] S1022, Non-curing butyl sealant filling. Non-curing butyl sealant is filled into the transverse sliding gap formed by the overlap of the lower sliding flashing and the water-retaining vertical edge. A flow-stopping flange, limiting flange, barbed edge, or closed boundary is provided at the upper end, lower end, or outer side of the transverse sliding gap to confine the non-curing butyl sealant within the sliding sealing area, preventing it from being squeezed out during the reciprocating thermal displacement of the roof panel.

[0052] Non-curing butyl sealant maintains flexibility and adhesion in long-term use environments. When aluminum-magnesium-manganese standing seam roof panels undergo reciprocating displacement due to temperature changes, the non-curing butyl sealant deforms with the relative displacement between the lower sliding flashing and the water-retaining vertical edge, thereby maintaining a continuous waterproof seal within the lateral sliding gap and reducing shear stress concentration at the sliding interface.

[0053] S1023, Flexible limiting clamp installation. Flexible limiting clamps are installed at intervals along the perimeter of the roof retaining wall, based on the node size and wind uplift resistance requirements. At least three flexible limiting clamps should be installed circumferentially. When the diameter of the roof penetration node is large, the node is located in a high wind pressure area, or the design negative wind pressure is high, the number of flexible limiting clamps should be increased to ensure that the spacing between adjacent clamps meets the requirements for vertical limiting and wind uplift resistance.

[0054] One end of the elastic limiting clip is press-fitted with the upper or top edge of the water-retaining vertical edge, and the other end is press-fitted with the limiting edge, barb edge, or pressing edge of the lower sliding flashing. The elastic limiting clip can be made of spring steel, stainless steel, or other weather-resistant and elastic metal materials, and applies a limiting preload to the lower sliding flashing through its own elastic restoring force.

[0055] The flexible limiting clips have a flexible press-fit limiting contact with the water-retaining vertical edge and the lower sliding flashing, rather than a rigid locking connection. The flexible limiting clips restrict the lower sliding flashing from detaching from the water-retaining vertical edge in the vertical direction, while allowing restricted relative sliding between the water-retaining vertical edge and the lower sliding flashing in the horizontal direction. This prevents the thermal displacement of the roof panel from being rigidly transmitted to the through-roof components through the flexible limiting clips.

[0056] Through the aforementioned locking structure, the lower sliding flashing is vertically restricted, preventing it from detaching from the water-retaining edge due to negative wind pressure. Simultaneously, thermal expansion and contraction displacement can still be released between the water-retaining edge and the lower sliding flashing within the roof panel plane. The elastic locking mechanism is positioned within the shielding area of ​​the lower sliding flashing and does not penetrate the effective waterproofing surface of the aluminum-magnesium-manganese standing seam roof panel.

[0057] S1024, Low-friction isolation layer application. If necessary, a low-friction isolation layer or weather-resistant lubricating layer may be applied to the sliding contact surface between the elastic retaining clip and the metal sheet. The low-friction isolation layer can be a PTFE dry lubricating film, a weather-resistant sliding pad, or other low-friction materials suitable for metal roof joints. The low-friction material is applied only to the mechanical sliding contact area, avoiding the main adhesion and sealing area of ​​the non-cured butyl sealant, and is not applied to the bonding surface of subsequent silicone sealant.

[0058] Before applying the sealant, the substrate for bonding the silicone sealant should be cleaned, dried, and degreased, and a primer should be applied according to the sealant product requirements. A low-friction isolation layer reduces the frictional resistance during horizontal sliding between the lower sliding flashing and the water-blocking edge, preventing mechanical jamming under dry friction conditions. The elastic limiting clips, lateral sliding gap, and low-friction isolation layer together form a sliding seal structure that combines vertical limiting and horizontal sliding guidance.

[0059] Reference Figure 4 Step S103 includes the following specific processes: S1031, the basic framework of the prefabricated flexible pressure-relief component. In a preferred embodiment, the flexible pressure-relief component uses EPDM rubber corrugated belt or other weather-resistant elastic corrugated belt as the structural framework, and the corrugated belt has a bellows-like pleated structure on the vertical cross section.

[0060] Weather-resistant elastic corrugated belts have a low elastic modulus and a high elongation. When the joint is subjected to tensile, compressive, or displacement displacement, the corrugated belt preferentially undergoes geometric deformation through fold unfolding, compression, or deflection, followed by elastic deformation of the material, thereby reducing the displacement transmission stiffness.

[0061] The maximum allowable deformation of the corrugated flexible breathable strip is not less than the design relative displacement between the lower sliding flashing and the upper fixed flashing sleeve. When the roof panel experiences thermal expansion and contraction, the corrugated flexible breathable strip preferentially absorbs local displacement through folding, compression, and deflection, allowing the waterproof and breathable membrane to primarily perform the functions of gas phase conduction and waterproofing, rather than acting as a primary load-bearing component, thereby reducing the risk of fatigue failure of the membrane under tension and shear.

[0062] S1032, a waterproof and breathable functional layer is provided. Breathable holes are created on the wall surface of the weather-resistant elastic corrugated belt, and a waterproof and breathable membrane is laminated at these holes. The waterproof and breathable membrane can be made of expanded polytetrafluoroethylene (ePTFE) or other membrane materials with waterproof and breathable properties. The membrane can be fixed to the breathable holes by mechanical pressing, clamping with pressure strips, butyl sealing rings, special adhesive layers, hot melt adhesive film pressing, or other reliable sealing connection methods.

[0063] Waterproof and breathable membranes allow gaseous fluids to pass through, mitigating the pressure difference between the labyrinthine shielded cavities and the internal concealed pressure-reducing chambers, while simultaneously preventing liquid water penetration. The effective permeable area, hydrostatic pressure resistance, and weather resistance of the waterproof and breathable membrane are determined based on the cavity volume, ventilation path, design wind pressure fluctuations, heavy rainfall conditions, and service life requirements, ensuring that it maintains its liquid water barrier capability while allowing gaseous flow.

[0064] S1033, Lower edge fixing of corrugated flexible breathable strip. The lower edge of the corrugated flexible breathable strip, which is composited with a waterproof and breathable membrane, is attached to the top inner wall of the lower sliding flashing, and a butyl double-sided sealing tape, sealing gasket, or other flexible sealing material is sandwiched between the two. A continuous pressure strip is then placed on the surface of the corrugated flexible breathable strip, and the lower edge of the corrugated flexible breathable strip is fixed to the metal wall of the lower sliding flashing using pop rivets, screws, or other fasteners. The fasteners only penetrate the metal wall of the lower sliding flashing and do not penetrate the effective waterproof surface of the aluminum-magnesium-manganese standing seam roofing panel.

[0065] Sealing gaskets, sealing rings, or localized adhesive layers are installed on the fastener heads, hole walls, and exposed ends to seal any tiny water seepage paths formed at the fastener perforations. The spacing between fasteners is determined based on the rigidity of the pressure strip and the sealing tightening requirements to prevent localized arching of the pressure strip between adjacent fasteners.

[0066] The continuous pressure strip transforms the point-like fastening force into a continuous linear compressive force, causing the flexible sealing material to deform under pressure and fill the microscopic gaps between the contact surfaces, thereby forming a continuous sealing boundary at the lower end of the corrugated flexible breathable strip. This fixing position is located at the top of the inner wall of the lower sliding flashing and does not penetrate the effective waterproof surface of the aluminum-magnesium-manganese standing seam roof panel.

[0067] S1034, Retractable High-Level Water-Avoiding Arrangement. After fixing the lower edge of the corrugated flexible breathing belt, the entire corrugated flexible breathing belt is pulled inward, keeping its upper edge suspended upward for subsequent connection with the upper fixed flooding sleeve. One side of the corrugated flexible breathing belt faces the labyrinthine shielding cavity, and the other side faces inward to conceal the pressure-reducing cavity. A waterproof and breathable membrane is placed on the controlled air connection path between the two cavities.

[0068] This recessed, high-position arrangement allows the corrugated flexible breathing strip to avoid direct scouring by external water flow and is concealed within the subsequently installed upper fixed flashing sleeve. During heavy rain, external rainwater mainly flows downwards along the outer perimeter of the node structure; the corrugated flexible breathing strip, located in the recessed, high-position area, is less susceptible to direct scouring by continuous water curtains, thus reducing the risk of the waterproof and breathable membrane being covered by a water film for an extended period. Even if a small amount of rainwater, mist, or condensation enters the labyrinthine shielding cavity, it can be discharged through the drainage seams, drainage holes, or drip edges at the bottom of the cavity, preventing liquid water from stagnating and continuously covering the waterproof and breathable membrane.

[0069] Reference Figure 5 Step S104 includes the following specific processes: S1041, the upper fixed flashing sleeve is sleeved on the outside of the roof penetration component, and the upper end of the upper fixed flashing sleeve is positioned, fixed and sealed to the roof penetration component.

[0070] When installing the corrugated flexible breathing strip, before the upper fixed flashing sleeve is in place, keep the upper edge of the corrugated flexible breathing strip in an unsecured, suspended state. When the upper fixed flashing sleeve is in place, leave operating space on the upper part of its inner wall for subsequent tightening of the pressure strip, or leave a temporary operating window on the side wall of the upper fixed flashing sleeve. After the position of the upper fixed flashing sleeve is corrected, fix the suspended upper edge of the corrugated flexible breathing strip to the upper part of the inner wall of the upper fixed flashing sleeve. When using a temporary operating window, seal the temporary operating window after fixing.

[0071] The upper fixed flashing sleeve forms a fixed sealing node with the roof penetration component, constituting a static reference point in the roof node sealing system. The upper fixed flashing sleeve and the roof penetration component can be fixed by circumferential welding, flange connection, clamp connection, or other mechanical fixing methods adapted to the material of the roof penetration component, and sealed with sealant, sealing ring, or waterproof gasket.

[0072] S1042, when installing corrugated flexible breathable strips, the suspended upper edge of the corrugated flexible breathable strip is fixed to the upper inner wall of the upper fixed flashing sleeve using pressure strips, sealing gaskets, and fasteners. At the fixing interface, the fasteners apply clamping force, causing the auxiliary sealing material inside the interface to deform under pressure and fill the micro-contact gaps. The fasteners only penetrate the metal wall surface of the upper fixed flashing sleeve or its inner connection part, and do not penetrate the effective waterproof surface of the aluminum-magnesium-manganese standing seam roof panel. Sealing gaskets, sealing rubber rings, or local adhesive layers are installed at the fastener perforation locations. After tightening, the exposed fastener heads and hole edges are sealed.

[0073] After the upper end is fixed, the corrugated flexible breathing band, the inner wall of the upper fixed flashing sleeve, and the inner wall of the lower sliding flashing component together form an internal concealed pressure-reducing cavity. The sealed boundary of the internal concealed pressure-reducing cavity includes the upper and lower fixed interfaces of the corrugated flexible breathing band, the fixed sealing interface between the upper fixed flashing sleeve and the roof penetration component, and the metal wall of the lower sliding flashing component. Except for the controlled air connection between the internal concealed pressure-reducing cavity and the labyrinthine shielding cavity via a waterproof and breathable membrane, the other boundaries of this internal concealed pressure-reducing cavity remain sealed. The internal concealed pressure-reducing cavity is generally not used as a liquid water drainage cavity; its inner wall can be equipped with an anti-condensation coating or localized guiding slopes to reduce the risk of occasional condensation retention. If a condensate drainage path is necessary, this path should be equipped with a one-way water-stop structure or a folded waterproof structure, and a direct path for liquid water to enter the internal concealed pressure-reducing cavity from the labyrinthine shielding cavity should be avoided.

[0074] After the upper edge of the corrugated flexible breathing strip is fixed and the temporary operating window is closed, a sealing treatment is performed at the junction of the upper fixed flashing sleeve and the top of the roof penetration component. The sealing treatment can use polyurethane sealant, weather-resistant silicone sealant, sealing rings, or other suitable materials to form a waterproof seal at the end.

[0075] S1043, the outer skirt of the upper fixed flashing sleeve extends downward and covers the outside of the lower sliding flashing component, thereby forming an overlapping labyrinthine shielding cavity. During the assembly process of the outer skirt extending downward, a temporary positioning fixture is used to maintain a uniform gap between the outer skirt of the upper fixed flashing sleeve and the lower sliding flashing component.

[0076] The gap is used to create a zigzag shielding path and drainage space, and its width is determined based on the node size, drainage requirements, manufacturing tolerances, and installation deviations. In one embodiment, the gap width is 10mm to 30mm to accommodate the requirements of node assembly, drainage, maintenance, and prevention of direct rainwater splashing.

[0077] The joint sealant joint formed in subsequent step S105 is used to continuously seal the direct infiltration path of liquid water; the concealed drainage joints, drainage holes, drip edges or drainage and ventilation composite grooves are staggered with the joint sealant joints, so that the labyrinth-like shielded cavity can still drain a small amount of splash water, condensate water or rainwater that has entered the cavity after the sealant is applied, while avoiding the formation of a direct infiltration path for liquid water.

[0078] In one specific embodiment, the labyrinthine concealed cavity includes a partial drainage notch located at the lower end of the outer skirt of the upper fixed flashing sleeve, a downward-folding water-blocking edge located inside the partial drainage notch, and a drip edge located on the outer wall of the lower sliding flashing. The partial drainage notch is located away from the continuous closed area of ​​the joint sealant, or is located radially outward, below, or laterally folded-back drainage area of ​​the joint sealant, allowing it to drain a small amount of water from the labyrinthine concealed cavity without forming a direct seepage path from the outside to the internal concealed pressure-reducing cavity or roof structural layer.

[0079] A small amount of water entering the cavity is blocked at the folding and dripping edges and discharged outwards, thus forming a concealed labyrinthine drainage structure where drainage is possible but liquid water cannot flow directly through. External rainwater is first blocked by the outer skirt of the upper fixed flashing sleeve; a small amount of splashing water, condensate, or rainwater enters the labyrinthine concealed cavity and is blocked by the folding and dripping edges and the staggered drainage path, preventing it from forming a direct path to the inner cavity, and is finally discharged through the low-level concealed drainage seams, drainage holes, or dripping edges.

[0080] The lowest point of the labyrinthine shielded cavity is equipped with circumferential intermittent drainage seams, concealed drain holes, or drip edges, so that splashing water, condensate, or a small amount of rain or mist entering the cavity can be discharged under gravity, avoiding long-term retention of liquid water.

[0081] When a waterproof and breathable membrane and an internal concealed pressure-reducing cavity are installed, the labyrinthine concealed cavity can establish controlled gas phase communication with the internal concealed pressure-reducing cavity through the waterproof and breathable membrane. This gas phase communication is used to alleviate the pressure difference between the two cavities and reduce the driving force for rainwater to migrate inward under negative pressure suction conditions.

[0082] S1044 controls the vertical overlap shielding depth between the outer skirt of the upper fixed flashing sleeve and the lower sliding flashing component. This vertical overlap shielding depth is set as follows: , The location of the node is determined based on the roof slope, design wind pressure, rainwater runoff direction, water accumulation height, and construction safety margin, and must meet the following requirements: ; In the formula, H2 is the vertical overlap shielding depth between the outer skirt of the upper fixed flashing sleeve and the lower sliding flashing component, in meters; The height of capillary climb that liquid water will experience within the gap, expressed in meters (m). The height of the reverse lift of rainwater under the action of wind pressure, expressed in meters; The unit is meters (m) to provide safety margins for surge protection, backflow prevention, and construction deviation.

[0083] In one implementation, Not less than 0.05m. By controlling the vertical overlapping shielding depth, the reverse climbing path of liquid water under capillary action and strong wind pressure can be extended, reducing the probability of external rainwater crossing the top of the lower sliding flashing and entering the internal node structure. This vertical overlapping shielding structure does not block the drainage path at the bottom of the labyrinthine shielding cavity.

[0084] Reference Figure 6 This step S105 includes the following specific processes: S1051, Backing Rod Filling and Compression Control. A polyethylene foam backing rod with a closed circumferential structure is inserted into the circumferential, rectangular, or irregularly shaped closed joint formed between the lower sliding flashing and the lower end of the outer skirt of the upper fixed flashing sleeve. The joint is located at the waterproof sealing boundary of the node, and the joint sealant is used to block the direct seepage path of liquid water between the outer skirt of the upper fixed flashing sleeve and the lower sliding flashing.

[0085] Concealed drainage joints, drainage holes, drip edges, or drainage-ventilation composite grooves are staggered with the joint sealant joints to avoid blocking the low-level drainage path of the cavity during joint sealing construction. When the joint sealant joint is continuously installed along the circumferential or length direction, the concealed drainage structure is located on the radially outer side, below the sealant joint, or at a lateral drainage position, allowing water in the labyrinthine concealed cavity to drain through a non-straight path and preventing the drainage structure and sealant joint from forming a direct liquid water infiltration channel.

[0086] The natural diameter of the polyethylene foam backing rod Based on the actual width of the joint The backing rod is determined and kept under moderate elastic compression after being inserted into the joint. In one embodiment, for 1.2 to 1.5 times.

[0087] After being pressed into the joint, the polyethylene foam backing rods press against the metal walls on both sides through elastic restoring force, and provide a bottom support surface for subsequent sealant injection. The installation elevation of the backing rods is determined according to the designed sealant depth to control the injection thickness of the silicone sealant and avoid three-sided adhesion.

[0088] S1052, inject weather-resistant silicone sealant with elastic displacement compensation capability into the joint above the polyethylene foam backing rod. Before injection, clean, dry, degrease and apply necessary primer to the adhesive substrate of the upper fixed flashing sleeve and the lower sliding flashing; after injection, compact and trim the surface of the weather-resistant silicone sealant along the joint to form a continuous, full and slightly concave cross-sectional shape.

[0089] The slightly concave cross-sectional shape improves the adhesion reliability between the colloid edge and the metal substrate, and relatively thins the central region of the colloid. This central thinning structure facilitates elastic tensile, compressive, or shear deformation of the colloid when the metal components on both sides undergo relative displacement, thereby reducing stress concentration within the colloid.

[0090] The sealant joint formed by the weather-resistant silicone sealant serves as an outer elastic waterproof seal boundary, not as a rigid connection restricting the elastic relative displacement of the lower sliding flashing relative to the upper fixed flashing sleeve. Thermal displacement of the roof panel is not rigidly transmitted to the roof penetration components through this sealant joint; the weather-resistant silicone sealant primarily compensates for residual relative misalignment between the lower sliding flashing and the upper fixed flashing sleeve through tensile, compressive, or shear elastic deformation. The material displacement rating, joint width, and center injection thickness of the silicone sealant are determined based on the designed relative displacement between the upper fixed flashing sleeve and the lower sliding flashing, allowing the joint to compensate through elastic deformation within the designed displacement range, without rigidly binding the upper fixed flashing sleeve to the lower sliding flashing.

[0091] S1053, constructs a double-sided bonded elastic sealing structure. The geometry of the silicone sealant within the joint is determined based on the joint width, the sealant material displacement grade, and the relative displacement of the joint design. The center injection thickness of the weather-resistant silicone sealant... With the width of the joint In one implementation, a match is made. for 0.5 to 1.0 times: ; In the formula, This refers to the aspect ratio coefficient between the center injection thickness of the weather-resistant silicone sealant and the width of the joint. The value ranges from 0.5 to 1.0, and is determined based on the material displacement grade of the weather-resistant silicone sealant, the width of the joint, and the relative displacement of the node design.

[0092] The allowable displacement capacity of the selected weather-resistant silicone sealant shall not be less than the maximum design relative displacement between the upper fixed flashing sleeve and the lower sliding flashing. This maximum design relative displacement is determined comprehensively based on the restricted slippage of the lower sliding flashing, the elastic compensation of the flexible pressure-relief component, and the relative misalignment that will occur at the joint. The joint width, the center injection thickness, and the sealant material displacement grade shall together ensure that the sealant does not peel off at the bonding interface or tear within the design displacement range.

[0093] A polyethylene foam backing rod is placed at the bottom of the silicone sealant to control the injection depth and prevent the sealant from bonding to the bottom of the joint. After curing, the silicone sealant only forms a two-sided bonding structure with the opposite sidewalls of the upper fixed flashing sleeve and the lower sliding flashing component, while its bottom remains unbonded with the backing rod. This avoids the sealant simultaneously bonding to the two metal walls and the bottom of the joint, thus preventing a three-sided bonding constraint.

[0094] When the metal components on both sides experience relative displacement due to temperature changes, wind load disturbances, or minor joint misalignments, the adhesive joints bonded on both sides absorb the displacement difference through their own elastic deformation. Since the bottom of the sealant is not bonded to the backing rod, and the adhesive material has elastic displacement compensation capabilities, this outer sealing structure forms a waterproof barrier without rigidly binding the upper fixed flashing sleeve to the lower sliding flashing component.

[0095] When the roof panel experiences thermal expansion and contraction, this displacement is released or guided through the water-retaining vertical edges, lateral sliding gaps, non-cured butyl sealant, and elastic limiting clips. The outer weather-resistant silicone sealant primarily serves as an elastic water sealant and does not provide horizontal rigid positioning. This stress arrangement avoids three-sided bonding constraints at the sealant joint, reduces the risk of sealant root tearing, and maintains the long-term reliability of the sealing barrier around the joint.

[0096] Specific application examples: This specific application example is based on the roof project of a stadium in southeastern coastal my country. It utilizes a high-waterproof aluminum-magnesium-manganese standing seam roof joint sealing method for the ventilation shaft joint penetrating the roof. The construction process includes joint opening, water-retaining edge forming, sliding sealing of the lower sliding flashing and non-curing butyl sealant, high-level installation of the corrugated flexible breathable strip, and the construction of the upper fixed flashing sleeve labyrinth-style shielding and two-sided adhesive sealing of the joint.

[0097] In the actual implementation, the technicians performed parameter calibration and numerical calculations based on the extreme working conditions: the maximum water accumulation height that would form around the node due to the known historical maximum rainfall was calculated. The depth is 0.12m, taking into account the construction safety margin. According to the formula for the height of the water-retaining vertical side Calculation Actual Meanwhile, the capillary rise height of liquid water is known. The design allows rainwater to rise in the opposite direction under strong wind pressure. Safety margin for backflow prevention According to the formula for overlap occlusion depth Calculation The actual width selected for the project was 0.15m. Additionally, the width of the joint... Set to 20mm, based on the formula for center glue thickness. (Take the aspect ratio coefficient) The adhesive thickness was controlled at 12mm, and a 25mm diameter backing rod was used to form a bond on both sides. The project and subsequent monitoring showed that after experiencing large seasonal temperature differences and typhoon and rainstorm conditions, no mechanical jamming or adhesive tearing occurred in the structural layers, and the internal hidden pressure relief cavity remained dry, verifying the engineering reliability of the waterproof transition structure.

[0098] To further verify the practical effect of this solution, the project team built a 1:1 test model of the roof penetration joint and compared it with the traditional rigid sealant sealing process. The test results show that under simulated cyclic thermal displacement of the roof panel and alternating wind pressure and rain conditions, the traditional rigid sealing joint is more prone to localized sealant damage and water seepage. In this embodiment, the joint, through the synergistic effect of lateral sliding gaps, non-curing butyl sealant, labyrinthine shielding cavity, and double-sided bonded elastic sealant joints, did not exhibit obvious mechanical jamming, sealant tearing, or measurable liquid water infiltration. The above verification results can be intuitively illustrated by two graphical appendices generated based on the experimental data: Figure 7 In the figure, the horizontal axis represents the number of cycles (0 to 5000 times), and the vertical axis represents the peak shear stress (MPa). The solid line in the legend represents the flexible sliding scheme of this embodiment, whose stress curve remains flat and at a low level below 0.2 MPa, indicating that the displacement is effectively absorbed. The dashed line represents the traditional rigid sealing scheme, whose stress increases significantly with the number of cycles, and experiences a sudden stress drop around 800 cycles (indicating joint cracking failure and stress release). (Refer to...) Figure 8 In the figure, the horizontal axis represents the alternating wind pressure level (increasing from 1.0 kPa to 5.0 kPa), and the vertical axis represents the amount of seepage water collected in the concealed cavity (ml). The first column in the legend represents the traditional scheme, in which the seepage water volume increases significantly after the wind pressure exceeds 3.0 kPa. The second column represents the scheme of this embodiment, in which no measurable liquid water seepage was detected at each tested wind pressure level, indicating that the labyrinthine concealed cavity and the multiple flexible sealing structure can improve the node's resistance to wind and rain backflow.

Claims

1. A method for sealing joints in a high-waterproof aluminum-magnesium-manganese standing seam roof, characterized in that, Includes the following steps: Node holes are made on the aluminum-magnesium-manganese standing seam roof panel around the roof component, with the size of the node holes being larger than the outer contour size of the roof component and leaving clearance space, and a continuous closed water-blocking edge is formed around the node holes. The lower sliding flashing is fastened to the outside of the water-blocking vertical edge. A lateral sliding gap is reserved between the lower sliding flashing and the water-blocking vertical edge. Non-curing butyl sealant is filled into the lateral sliding gap so that the non-curing butyl sealant is located in the closed or semi-closed sliding sealing cavity. The upper fixed flashing sleeve is fitted onto the outside of the roof penetration component and positioned, fixed and sealed to the roof penetration component. The outer skirt of the upper fixed flashing sleeve extends downward and covers the outside of the lower sliding flashing component, forming a labyrinth-like shielding cavity. A joint seam is formed between the lower end of the outer skirt of the upper fixed flashing sleeve and the lower sliding flashing component. The labyrinth-like shielding cavity is connected to the outside through a concealed drainage seam, drainage hole or drip edge that is offset from the sealant seam subsequently formed in the joint seam. Polyethylene foam backing rods are filled into the joint, and weather-resistant silicone sealant with elastic displacement compensation capability is injected above the polyethylene foam backing rods, so that the weather-resistant silicone sealant forms a two-sided bonding structure.

2. The method for sealing joints of a high-waterproof aluminum-magnesium-manganese standing seam roof according to claim 1, characterized in that, In the step of forming a continuous closed water-retaining vertical edge around the perimeter of the node hole: Prefabricated circumferential closed flange reinforcements that match the shape of the node holes are installed around the perimeter to form a continuous closed water-blocking vertical edge. Alternatively, when on-site cold bending conditions are available, the edge of the node hole can be folded upwards using a progressive flanging method to form a continuous closed water-blocking edge without setting through fasteners on the effective waterproof surface of the roof panel. During construction, the final forming height of the water-retaining vertical edge is determined based on the drainage conditions, design water accumulation height, risk of wind and rain backflow, and construction safety margin at the location of the roof node. The final forming height of the water-retaining vertical edge is not less than the sum of the maximum water accumulation height that may form around the roof node under the design conditions and the safety margins for surge protection, water creep protection, and construction deviation.

3. The method for sealing joints of a high-waterproof aluminum-magnesium-manganese standing seam roof according to claim 1, characterized in that, After filling the lateral sliding gap with non-cured butyl sealant, the following steps are also included: Elastic limit clips are installed at intervals around the perimeter of the water-retaining vertical edge; One end of the elastic limiting clip is pressed into the upper part or top edge of the water-blocking vertical edge, and the other end of the elastic limiting clip is pressed into the limiting edge, barb edge or pressing edge of the lower sliding flashing. The elastic restoring force of the elastic limiting clip is used to apply a limiting pre-tightening force to the lower sliding flashing. This restricts the lower sliding flashing from detaching from the water-blocking edge in the vertical direction, while allowing restricted relative sliding between the water-blocking edge and the lower sliding flashing in the horizontal direction. This prevents the thermal displacement of the roof panel from being rigidly transmitted to the roof penetration components through the elastic limiting clip.

4. The method for sealing joints of a high-waterproof aluminum-magnesium-manganese standing seam roof according to claim 1, characterized in that, Before forming the labyrinthine shielding cavity, the following steps are also included: Prefabricated corrugated flexible breathing belt composed of weather-resistant elastic corrugated belt and waterproof breathable membrane; Breathable holes are set on the wall surface of the weather-resistant elastic corrugated belt, and a waterproof and breathable membrane is laminated at the breathable holes. The lower edge of the corrugated flexible breathing tape with a waterproof and breathable membrane is attached to the top of the inner wall of the lower sliding flashing component, and the lower edge of the corrugated flexible breathing tape is fixed to the metal wall of the lower sliding flashing component by pressure strips, sealing gaskets and fasteners. After fixing the lower edge of the corrugated flexible breathing belt, pull the entire corrugated flexible breathing belt inward, keeping the upper edge of the corrugated flexible breathing belt suspended upward, and placing the entire corrugated flexible breathing belt in the high-level water-avoiding area within the shielding range of the upper fixed flood sleeve. The corrugated flexible breathing belt is installed in a non-tensioned state or with reserved fold deformation margin. When relative misalignment occurs at the nodes, displacement is absorbed preferentially through fold unfolding, compression, or deflection.

5. The method for sealing joints of a high-waterproof aluminum-magnesium-manganese standing seam roof according to claim 4, characterized in that, After the upper fixed flashing sleeve is fitted onto the outside of the roof penetration member, the following steps are also included: The upper edge of the corrugated flexible breathing belt is fixed to the upper inner wall of the upper fixed flashing sleeve by pressure strips, sealing gaskets and fasteners. After fixing the upper edge of the corrugated flexible breathing belt, the corrugated flexible breathing belt, the inner wall of the upper fixed flooding sleeve and the inner wall of the lower sliding flooding component are together enclosed to form an internal concealed pressure-relieving cavity. During construction, the boundaries of the internal concealed pressure-relief cavity, except for the waterproof and breathable membrane, should be sealed. The internal concealed pressure-relief cavity and the labyrinth-style shielded cavity should be connected by a controlled airflow through the waterproof and breathable membrane. This will help to release the pressure difference between the labyrinth-style shielded cavity and the internal concealed pressure-relief cavity and prevent liquid water from entering the internal concealed pressure-relief cavity.

6. The method for sealing joints of a high-waterproof aluminum-magnesium-manganese standing seam roof according to claim 1, characterized in that, In the step of extending the outer skirt of the upper fixed flashing sleeve downwards and covering the outside of the lower sliding flashing: Measure and control the vertical overlap shielding depth between the outer skirt of the upper fixed flashing sleeve and the lower sliding flashing component; The vertical overlap shielding depth is determined based on the roof slope, design wind pressure, rainwater scouring direction, water accumulation height, and construction safety margin at the node location. The vertical overlap shielding depth shall be no less than the sum of the capillary rise height of liquid water in the gap, the reverse rise height of rainwater under the action of design wind pressure, surge protection, backflow prevention and construction deviation safety margin; By controlling the vertical overlap shielding depth, the reverse climbing path of liquid water under capillary action and strong wind pressure is extended.

7. The method for sealing joints of a high-waterproof aluminum-magnesium-manganese standing seam roof according to claim 1, characterized in that, The process of forming the labyrinthine shielding cavity also includes the following steps: A local drainage gap is provided at the lower end of the outer skirt of the upper fixed flashing sleeve; A downward-folding, water-retaining edge is formed inside the local drainage gap; A drip edge is formed on the outer wall of the lower sliding flashing component; During construction, the local drainage gap should be avoided from the continuous closed area of ​​the joint sealant, or the local drainage gap should be located radially outside, below, or in the drainage area of ​​the joint sealant. By using the downward-folding water-blocking and dripping edges, the small amount of water entering the labyrinthine shielded cavity is blocked, and the water is guided to drain out radially through a non-straight path.

8. The method for sealing joints of a high-waterproof aluminum-magnesium-manganese standing seam roof according to claim 1, characterized in that, In the step of filling the joint with polyethylene foam backing rods and injecting weather-resistant silicone sealant with elastic displacement compensation capability above the polyethylene foam backing rods: Select polyethylene foam backing rods according to the actual width of the joint, so that the natural diameter of the polyethylene foam backing rods is 1.2 to 1.5 times the actual width of the joint. The polyethylene foam backing rod is pressed into the joint, so that the polyethylene foam backing rod is pressed against the metal wall on both sides of the joint through elastic restoring force, and provides a bottom support surface for subsequent glue injection. The injection thickness of the weather-resistant silicone sealant is controlled by using polyethylene foam backing rods, and the weather-resistant silicone sealant is prevented from bonding to the bottom of the joint, thereby avoiding the formation of three-sided adhesion. After injecting the weather-resistant silicone sealant, the surface of the sealant is compacted and trimmed along the joint to form a continuous, full, and slightly concave cross-sectional shape. The central area of ​​the sealant is also relatively thinned to facilitate elastic stretching, compression, or shear deformation through the sealant when the metal components on both sides undergo relative displacement.

9. A method for sealing joints in a high-waterproof aluminum-magnesium-manganese standing seam roof according to claim 8, characterized in that, In the step of injecting weather-resistant silicone sealant with elastic displacement compensation capability: The center injection thickness of the weather-resistant silicone sealant is determined based on the material displacement grade of the weather-resistant silicone sealant, the width of the joint, and the relative displacement of the node design. Make sure the center injection thickness of the weather-resistant silicone sealant matches the width of the joint, and make the center injection thickness of the weather-resistant silicone sealant 0.5 to 1.0 times the width of the joint; Weather-resistant silicone sealant with a displacement capacity not less than the maximum design relative displacement between the upper fixed flashing sleeve and the lower sliding flashing component is selected, so that the sealant joint can be compensated by elastic deformation within the design displacement range, instead of rigidly fixing the upper fixed flashing sleeve and the lower sliding flashing component.

10. A method for sealing joints in a high-waterproof aluminum-magnesium-manganese standing seam roof according to claim 1, characterized in that, When the roof-penetrating member is a linear roof-penetrating member extending along the roof, the following steps are included: A linear water-retaining vertical edge is continuously provided along the length direction of the linear through-roof component; The long, sliding flashing is fastened to the outside of the linear water-retaining vertical edge; A sliding gap is reserved between the linear water-retaining vertical edge and the long strip sliding flashing; Fill the sliding gap with non-cured butyl sealant; The linear, long strip-shaped fixed flashing cap, which serves as the upper fixed flashing sleeve, is fixedly connected to the linear through-roof component, and the long strip-shaped fixed flashing cap is overlapped downwards and covered on the outside of the long strip-shaped sliding flashing plate, thereby forming a linear labyrinthine shielding cavity. Intermittent concealed drainage seams, drainage holes, or drip edges are provided at the bottom of the linear labyrinthine concealed cavity; End sealing components, water-blocking components, or end seals are installed at the ends of the linear labyrinth-type shielded cavity along its length to prevent the formation of a straight seepage path at the ends of the linear labyrinth-type shielded cavity along its length.

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