Waterproof structure for opening out of roof
By installing a multi-layered waterproof structure at the roof opening, and using strips and screws for fixing combined with sealant filling, the problem of water leakage and seepage caused by temperature changes in steel structure buildings is solved, improving the waterproof effect and the stability of the roof system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-03-13
AI Technical Summary
Waterproofing at roof openings in steel structure buildings is often ineffective in preventing leaks and seepage, especially due to structural deformation caused by temperature changes and the thermal expansion and contraction of materials.
Four first and second pressure strips are arranged around the outer perimeter of the pipes exiting the roof. They are fixed to the color steel plate and the roof base plate with screws and filled with sealant to form a multi-layer waterproof structure, including an additional layer of waterproof membrane, thermal insulation cotton and color steel plate, which increases the adhesion and stability of the materials.
It effectively avoids material deformation caused by thermal expansion and contraction, reduces water leakage and seepage, and improves the overall performance and service life of the metal roofing system.
Smart Images

Figure CN223991528U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steel structure engineering, specifically to a waterproof structure for roof openings. Background Technology
[0002] In the field of steel structure construction, waterproofing at roof openings has always been a challenging issue affecting the overall quality of the building and the user experience. Traditionally, the roof frame is usually directly fixed to the roof purlins. Some food factories temporarily add roof openings for exhaust fumes, typically located on the roof slab. Because the pipes within these openings connect to exhaust stacks on the production equipment below, the significant temperature fluctuations within these stacks cause thermal expansion and contraction of the materials, leading to structural deformation and delamination near the openings, ultimately resulting in leaks and seepage. To effectively address this problem, a waterproofing structure for roof openings is proposed, resolving roof leaks and seepage, significantly improving the overall performance of the metal roofing system, and extending its service life. Utility Model Content
[0003] The purpose of this utility model is to provide a waterproof structure for roof openings to solve the problems mentioned in the background art.
[0004] A waterproof structure for a roof opening, characterized in that it includes a roof opening pipe, purlins, a roof base plate laid above the purlins, and an additional layer of waterproof membrane, thermal insulation cotton, waterproof membrane, and color steel plate laid sequentially from bottom to top on the roof base plate. The roof opening pipe passes through the color steel plate, waterproof membrane, thermal insulation cotton, additional layer of waterproof membrane, and roof base plate from top to bottom. Four first pressure strips are evenly distributed along the outer perimeter of the roof opening pipe on the color steel plate. The first pressure strips on both sides of the pipe are symmetrical and parallel to each other. The first pressure strips are fixed to the color steel plate by first screws, and the first screws penetrate downward through the color steel plate, waterproof membrane, thermal insulation cotton, and additional layer of waterproof membrane and are anchored inside the roof base plate.
[0005] Preferably, the horizontal distance between the first pressure strip and the outer wall of the pipe exiting the roof is ≤300mm.
[0006] Preferably, four second pressure strips are evenly distributed along the outer perimeter of the roof pipe on the additional waterproof membrane. The second pressure strips located on both sides of the pipe are symmetrical and parallel to each other. The second pressure strips are fixed to the additional waterproof membrane by second screws, and the second screws penetrate downward through the additional waterproof membrane and are anchored in the roof base plate.
[0007] Preferably, the horizontal distance between the first pressure strip and the pipe exiting the roof is greater than the horizontal distance between the second pressure strip and the opening exiting the roof.
[0008] Preferably, the roof-exit pipe is covered with a circumferential waterproof membrane, and a rubber gasket is fitted on the upper end of the circumferential waterproof membrane. The rubber gasket is locked and sealed on the outside by a stainless steel clamp, and the distance between the stainless steel clamp and the color steel plate is ≥150mm.
[0009] Preferably, a strip-shaped waterproof membrane is placed over the first pressure strip, and the surface area of the strip-shaped waterproof membrane is larger than the top surface area of the first pressure strip.
[0010] Preferably, the contact points between the roof-exit pipe and the color steel plate, waterproof membrane, thermal insulation cotton, additional waterproof membrane, and roof base plate are all filled with sealant.
[0011] Preferably, sealant is filled between each of the first pressure strips and the waterproof membrane.
[0012] Beneficial effects
[0013] (1) The first pressure strip and the first screw are used together to anchor the color steel plate, waterproof membrane, thermal insulation cotton, additional waterproof membrane and roof bottom plate together, reducing the impact of thermal expansion and contraction on material deformation, thereby avoiding water leakage and seepage.
[0014] (2) The second pressure strip and the second screw are used together to anchor the additional waterproof membrane to the roof bottom plate, increasing the adhesion between the materials, thereby increasing stability and preventing leakage and seepage. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 This is a front sectional view of the present invention;
[0017] Figure 3 for Figure 2 Enlarged view of point A in the middle;
[0018] Figure 4 for Figure 2 Enlarged view of point B in the middle;
[0019] 1. Purlins, 2. Roof base plate, 3. Additional waterproof membrane, 4. Thermal insulation cotton, 5. Waterproof membrane, 6. Color steel plate, 7. Pipes exiting the roof, 8. First pressure strip, 9. First screw, 10. Second pressure strip, 11. Second screw, 12. Strip waterproof membrane, 13. Rubber gasket, 14. Stainless steel clamp, 15. Circumferential waterproof membrane. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0021] In the description of this utility model, it should be understood that the terms "middle", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0022] like Figure 1-4 As shown, a waterproof structure for a roof opening includes a roof opening pipe 7, purlins 1, a roof base plate 2 laid above the purlins, and an additional layer of waterproof membrane 3, insulation cotton 4, waterproof membrane 5, and a color steel plate 6 laid sequentially from bottom to top on the roof base plate. The roof opening pipe passes through the color steel plate, waterproof membrane, insulation cotton, additional layer of waterproof membrane, and roof base plate from top to bottom. Four first pressure strips 8 are evenly distributed along the outer perimeter of the roof opening pipe on the color steel plate. The first pressure strips on both sides of the pipe are symmetrical and parallel to each other, and two adjacent first pressure strips are perpendicular to each other. The first pressure strips are fixed to the color steel plate by first screws 9, and the first screws penetrate downward through the color steel plate, waterproof membrane, insulation cotton, and additional layer of waterproof membrane and are anchored inside the roof base plate. The horizontal distance between the first pressure strips and the outer wall of the roof opening pipe is ≤300mm.
[0023] Four second pressure strips 10 are evenly distributed along the outer perimeter of the roof-exit pipe on the additional waterproof membrane. The second pressure strips on both sides of the pipe are symmetrical and parallel to each other, with adjacent second pressure strips perpendicular to each other. The second pressure strips are fixed to the additional waterproof membrane by second screws 11, which penetrate downwards through the additional waterproof membrane and are anchored within the roof slab. The horizontal distance between the first pressure strip and the roof-exit pipe is greater than the horizontal distance between the second pressure strip and the roof opening. Both the first and second screws are self-tapping screws.
[0024] The pipes exiting the roof are covered with a circumferential waterproof membrane 15, with a rubber gasket 13 fitted at the upper end. The rubber gasket is locked and sealed by a stainless steel clamp 14, with a vertical distance of ≥150mm between the stainless steel clamp and the color steel plate. A strip-shaped waterproof membrane 12 covers the first pressure strip, with a surface area larger than the top surface area of the first pressure strip. Sealant is used to fill the contact points between the pipes exiting the roof and the color steel plate, waterproof membrane, insulation cotton, additional waterproof membrane, and roof floor. Sealant is also used between each first pressure strip and the waterproof membrane.
[0025] Working principle
[0026] When temporary openings are required in the roof during construction, the opening is first made in the roof base slab, and the roof pipe 7 is placed inside the opening. Sealant is applied to the contact area between the roof base slab 2 and the roof pipe. Then, an additional waterproof membrane 3 is laid on the roof slab, with a central opening to fit the roof pipe. Sealant is applied to the contact area between the additional waterproof membrane and the roof pipe. Four second pressure strips 10 are placed on the additional waterproof membrane and secured with multiple second screws 11. Adjacent second pressure strips are vertically distributed to increase the rigidity of the roof base slab at the roof pipe location. Insulation cotton 4 is then laid on top of the additional waterproof membrane, with a central opening to fit the roof pipe, and sealant is applied to the contact area. Finally, insulation cotton 4 is laid on top of the insulation. Waterproof membrane 5 is installed with openings to fit the pipes exiting the roof, and sealant is applied at the contact points. Then, a color steel plate 6 is laid on top of the waterproof membrane. The color steel plate is also installed with openings to fit the pipes exiting the roof, and sealant is applied at the contact points between the color steel plate and the waterproof membrane. Four first pressure strips 8 are placed on the color steel plate, with adjacent first pressure strips distributed vertically. The first pressure strips are fixed with multiple first screws 9. The first screws penetrate downwards through the color steel plate, waterproof membrane, insulation cotton, and additional layer of waterproof membrane and are anchored inside the roof base plate. A circumferential waterproof membrane 15 is fitted on the part of the pipes exiting the roof that extends above the color steel plate. A rubber gasket 13 is fitted on the upper end of the circumferential waterproof membrane. A stainless steel clamp 14 is fitted over the rubber gasket for locking, preventing water from falling into the space between the outer wall of the pipe and the circumferential waterproof membrane.
[0027] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.
Claims
1. A waterproof structure for roof openings, characterized in that: The roof pipe, purlin, roof bottom plate, additional layer waterproof roll, insulation cotton, waterproof roll and color steel plate are sequentially arranged from bottom to top, the roof pipe penetrates the color steel plate, waterproof roll, insulation cotton, additional layer waterproof roll and roof bottom plate from top to bottom, four first pressing strips are uniformly distributed on the color steel plate along the outer periphery of the roof pipe, the first pressing strips on both sides of the pipe are symmetrically arranged and parallel to each other, the first pressing strips are fixed on the color steel plate by first screws, and the first screws penetrate the color steel plate, waterproof roll, insulation cotton, additional layer waterproof roll and are anchored in the roof bottom plate.
2. The waterproof structure of a roof exit opening according to claim 1, wherein: The horizontal distance between the first pressing strip and the outer wall of the roof pipe is less than or equal to 300 mm.
3. The waterproof structure of a roof exit opening according to claim 1, wherein: Four second pressing strips are uniformly distributed on the additional layer waterproof roll along the outer periphery of the roof pipe, the second pressing strips on both sides of the pipe are symmetrically arranged and parallel to each other, the second pressing strips are fixed on the additional layer waterproof roll by second screws, and the second screws penetrate the additional layer waterproof roll and are anchored in the roof bottom plate.
4. The waterproof structure of a roof exit opening according to claim 3, wherein: The horizontal distance between the first pressing strip and the roof pipe is greater than the horizontal distance between the second pressing strip and the roof pipe opening.
5. The waterproof structure for roof openings as described in claim 1, characterized in that: The roof pipe is provided with a circumferential waterproof roll, the circumferential waterproof roll is provided with a rubber gasket at the upper end, the outer side of the rubber gasket is locked and sealed by a stainless steel hoop, and the distance between the stainless steel hoop and the color steel plate is greater than or equal to 150 mm.
6. The waterproof structure of an outbuilding hole according to claim 1, wherein: The first pressing strip is covered with a strip-shaped waterproof roll, and the surface area of the strip-shaped waterproof roll is greater than the top surface area of the first pressing strip.
7. The waterproof structure of an outbuilding hole according to claim 1, wherein: The roof pipe, the color steel plate, the waterproof roll, the insulation cotton, the additional layer waterproof roll and the roof bottom plate are filled with sealant at the contact position.
8. The waterproof structure of an outbuilding hole according to claim 1, wherein: Each first pressing strip and waterproof roll is filled with sealant.