Roof heat shielding structure

Abstract

This invention provides a roof heat-shielding structure that places minimal load on the existing roof and can be constructed regardless of the spacing of the existing roof's irregularities. [Solution] The roof heat-shielding structure 1 is constructed on an existing roofing material 2 having an uneven surface and comprises a metal horizontal base member 3 extending above the existing roofing material 2 and in a direction Y perpendicular to the roof flow direction X of the existing roofing material 2, a metal vertical base member 4 extending above the horizontal base member 3 and in the roof flow direction X, a steel plate 5 attached to the upper side of the vertical base member 4, and a material 6 with high reflectivity to radiant heat, such as aluminum foil, provided between the steel plate 5 and the existing roofing material 2. Multiple horizontal base members 3 are provided at intervals, and multiple vertical base members 4 are provided at the same intervals in the perpendicular direction Y, and a ventilation layer 7 is formed between the steel plate 5 and the existing roofing material 2.

Description

Technical Field

[0001] The present invention provides a heat insulation structure for a roof, wherein thin horizontal base members are arranged at regular intervals in a direction perpendicular to the roof flow direction on an existing uneven roof material, vertical base members are arranged at regular intervals in the roof flow direction on the horizontal base members, a material with high reflectivity to radiant heat such as aluminum foil is arranged between a steel plate and the existing roof material, a double roof structure is formed by mounting the steel plate on the vertical base members, the same steel plate can be used even if the convex spacing of the existing roof material is different, and significant improvement of indoor environment and energy saving can be achieved by ventilating the space between the steel plate and the existing roof material.

Background Art

[0002] A construction method is disclosed, in which horizontal crosspieces made of C-shaped steel or the like are constructed on a corrugated slate roof in a direction perpendicular to the roof flow, and an uneven roof material is constructed thereon. A double-structure construction method is also known, in which a tight frame of a predetermined shape is constructed on an existing roof material, and a new roof material is constructed from the outdoor side (for example, Patent Document 1).

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Ideally, corrugated slate buildings containing asbestos should be removed and replaced with new steel sheets, but the burden of permits and disposal is significant, hindering progress. Furthermore, due to aging, there are issues such as leaks and asbestos dispersion, leading to an increase in cover roofing methods that encase the entire roof with metal. However, few buildings constructed during this period meet current seismic standards, and new steel roofing sheets are being installed with tacit agreement. For example, one method involves installing C-shaped steel beams perpendicular to the roof slope direction on corrugated slate roofs, and then installing the corrugated roofing material on top. This method uses thick metal sheets, approximately 0.6mm to 0.8mm thick, resulting in a load of 8.0 to 10 kg / m². 2 The added weight places a significant burden on the building's earthquake resistance.

[0005] While there is a method of directly attaching new roofing material in the direction of the roof slope of a corrugated slate roof, the connection points of the slate roofing materials have large steps where the upper and lower roofing materials overlap. Therefore, even with direct attachment, there will be strength issues unless the roofing material is strong enough. Thus, this method also requires a strong, textured roofing material, and it is necessary to use a material with a thickness of approximately 0.5 mm to 0.6 mm, weighing 7.0 kg / m². 2 This presents a problem that makes things more difficult.

[0006] Furthermore, because existing roofs have varying degrees of unevenness depending on the type of roofing, it is necessary to prepare new roofing materials of a corresponding size for each type of existing roof, which increases costs.

[0007] This invention was made to solve the above problems and aims to provide a roof heat-shielding structure that places less load on the existing roof and can be constructed regardless of the spacing of the unevenness of the existing roof. [Means for solving the problem]

[0008] The heat-shielding roof structure according to the present invention is constructed on an existing roofing material having an uneven surface, and comprises: a first metal base member extending above the existing roofing material and in a direction perpendicular to the roof flow direction of the existing roofing material; a second metal base member extending above the first base member and in the direction of roof flow; a steel plate attached to the upper side of the second base member; and a material with high reflectivity to radiant heat, such as aluminum foil, provided between the steel plate and the existing roofing material. The first base members are provided in multiple quantities at intervals, and the second base members are provided in multiple quantities at the same intervals in a perpendicular direction, and a ventilation layer is formed between the steel plate and the existing roofing material.

[0009] In the heat-shielding roof structure according to the present invention, the second base member is hat-shaped, and the steel plate is formed on one end and has a fitting portion for fitting the second base member from the outside, and a contact portion formed on the other end that abuts against the top surface of the adjacent second base member. [Effects of the Invention]

[0010] In the heat-shielding roof structure according to the present invention, since the second base members are provided in multiple units at the same intervals in orthogonal directions, the steel sheets used as the new roofing material can be the same size. This means that even if the existing roofing material has different spacing of irregularities (slate roofs, corrugated metal roofs, galvanized iron roofs, etc.), the same steel sheets can be used, and the standardization of steel sheets can be achieved, significantly reducing the product price. Furthermore, in the heat-shielding roof structure according to the present invention, a material with high reflectivity against radiant heat, such as aluminum foil, is provided between the steel sheets and the existing roofing material, and a ventilation layer 7 is formed between the steel sheets and the existing roofing material, so the indoor environment can be significantly improved and energy saving is possible.

[0011] A steel plate can be used that has a fitting portion on one end for fitting a second base member and a contact portion on the other end for contacting the top surface of an adjacent second base member. This allows for a lighter steel plate, reducing the load on existing roofs and making it suitable for use in areas where seismic resistance is a concern, such as slate buildings. Furthermore, because the steel plate is very light and easy to handle, transportation and lifting costs can be significantly reduced, resulting in a very cost-effective solution. [Brief explanation of the drawing]

[0012] [Figure 1] This is a cross-sectional view of a roof heat-shielding structure according to an embodiment of the present invention. [Figure 2] This is a perspective view of a heat-shielding steel plate constituting a heat-shielding structure for a roof according to an embodiment of the present invention. [Figure 3] This figure illustrates a method for constructing a roof heat-shielding structure according to another embodiment of the present invention, where (a) shows the step of attaching a horizontal base member and (b) shows the step of attaching a vertical base member. [Figure 4] This figure shows a heat-shielding roof structure according to another embodiment of the present invention. [Figure 5] This figure shows a heat-shielding roof structure according to another embodiment of the present invention. [Modes for carrying out the invention]

[0013] The best mode for carrying out the present invention will be described below with reference to Figures 1 to 3.

[0014] With global warming, conventional insulation methods are becoming increasingly insufficient. Therefore, some are constructing double-roof structures with insulation in between. However, insulation alone cannot eliminate summer heat, and the increased weight of the roof creates seismic resistance issues. Furthermore, the need for solar power generation is increasing due to global warming, which will further increase the load on the roof. Therefore, even when adopting a double-roof structure, using lightweight new roofing materials is a crucial challenge. Converting the entire roof to a double-roof structure is expensive, making cost-effective implementation a critical issue.

[0015] The heat-shielding structure of a roof according to the present invention is constructed on an existing roof material having irregularities. As shown in Fig. 1, this heat-shielding structure 1 for a roof extends, in the vertical direction Z, above the existing roof material 2 having irregularities, in an orthogonal direction Y perpendicular to the roof flow direction X of the existing roof material 2. It comprises: an installed metal lateral base member (first base member) 3; a metal longitudinal base member (second base member) 4 that is located above the lateral base member 3 and extends in the roof flow direction X; a steel plate 5 attached to the longitudinal base member 4 from above; and a material 6 having high reflectivity to radiant heat, such as aluminum foil, affixed to the back surface of the steel plate 5. A plurality of the lateral base members 3 are provided at intervals, and a plurality of the longitudinal base members 4 are provided at constant intervals in the orthogonal direction. A ventilation layer 7 is formed between the steel plate 5 and the existing roof material 2. A steel plate 5 having a material 6 with high reflectivity to radiant heat such as aluminum foil affixed to the back surface thereof is referred to as a heat-shielding steel plate 5A.

[0016] A major feature of the present invention is that steel plates 5 of the same size can be used even if the intervals between the convex portions of the existing roof material 2 are different. For the steel plate 5, for example, Galvalume steel plate (registered trademark) is used.

[0017] The heat-shielding structure 1 for a roof according to the present invention is a construction method for forming a double structure by constructing heat-shielding steel plates 5A on an existing uneven roof material 2, such as a slate roof, a folded-plate roof, or a galvanized iron roof.

[0018] The first object of the present invention is to reduce the weight of the heat-shielding steel plate 5A in order to reduce the problem of earthquake resistance. Therefore, the heat-shielding steel plate 5A is basically used as a flat plate and formed into a shape like a wood batten roof.

[0019] The second point is that the same heat-shielding steel plate 5A can be used regardless of whether the existing roof material 2 is slate, 88-type folded plate, or galvanized roofing. In other words, the present invention can be applied to any existing roof material 2 as long as it has irregularities.

[0020] The third point is that, in the heat insulating structure 1 for a roof of the present invention, the ventilation layer 7 is used for heat discharge, and by making the horizontally provided horizontal base member 3 thin, turbulence is less likely to occur and thermal efficiency does not deteriorate.

[0021] An important point of the present invention is how to reduce the weight of a newly constructed roof using the heat insulating steel sheet 5A, and at the same time, reducing the weight of the roof base materials (the horizontal base member 3 and the vertical base member 4) that support the heat insulating steel sheet 5A is also important. In addition, in the existing roof material 2, bolts 8 often protrude toward the outdoor side, and it is important to prevent the heat insulating steel sheet 5A from coming into contact with these bolts 8. To avoid this, the horizontal base member 3 extending in the orthogonal direction Y is attached.

[0022] Providing the horizontal base member 3 also has the purpose of supporting the vertical base member 4, and when the flat heat insulating steel sheet 5A is placed from the outdoor side, it also has the role of avoiding the bolts 8 and nuts 9 protruding from the existing roof material 2. However, to reduce the weight of the horizontal base member 3, it is necessary to make it as thin as possible. When the bolts 8 and nuts 9 protrude from the existing roof material 2, the bolts 8 protruding from the nuts 9 are cut with a sander or the like to minimize the protruding height from the existing roof material 2.

[0023] As the material of the horizontal base member 3, a flat bar made of aluminum or steel sheet is used, but when the size of the nut protruding from the existing roof material 2 is large, a flat square pipe can also be used. The weight per unit area of the horizontal base member 3 is 0.3 to 0.5 kg / m 2 is preferable.

[0024] As shown in FIG. 3(a), the horizontal base members 3 are extended toward the orthogonal direction Y orthogonal to the roof flow direction X, are spaced apart from each other, and are directly provided on the existing roof material 2. The intervals at which the horizontal base members 3 are provided do not need to be constant, and are appropriately determined according to the size and condition of the existing roof material 2 and the like.

[0025] The vertical base members 4 extend in the direction of the roof slope X and are directly attached to the horizontal base members 3 at the same interval D as shown in Figure 3(b). These vertical base members 4 also serve as positioning members so that the position of the roofing material is determined simply by placing the heat-shielding steel plate 5A from the outside. However, if another thin, flat heat-shielding steel plate 5A is placed on top, a section is needed where a person can stand, and these vertical base members also serve as the equivalent of roof rafters. The vertical base members 4 are made by processing thin steel plates of 0.27 mm to 0.35 mm into a hat shape and directly fixing them to the horizontal base members 3 with screws. The purpose of the vertical base members 4 is to create a roof when the heat-shielding steel plate 5A is dropped in from the outside, so they need to be installed at regular intervals on top of the horizontal base members 3. The weight per unit area of ​​the vertical base members 4 is 0.5 to 0.6 kg / m 2 It is preferable.

[0026] As shown in Figure 2, the heat-shielding steel plate 5A has a fitting portion 10 formed on one end and a contact portion 11 formed on the other end. The fitting portion 10 fits onto the vertical base member 4 from the outside, and the contact portion 11 contacts the top surface of the adjacent vertical base member 4 (Figure 1). Then, adjacent heat-shielding steel plates 5A are installed by fitting the vertical base member 4 from above the contact portion 11 via the fitting portion 10, thereby constructing a continuous new roof. Note that the back surface of the fitting portion 10 is not provided with a material 6 that has a high reflectivity against radiant heat, such as aluminum foil.

[0027] The heat-shielding steel plate 5A has a material 6 with high reflectivity against radiant heat, such as aluminum foil, attached to its back surface. To ensure strength, one end of the steel plate 5 is designed to fit into a hat-shaped vertical base member 4. The other end is shaped to abut against the top surface of the adjacent vertical base member 4. In other words, when the heat-shielding steel plate 5A is dropped into the vertical base member 4 from the outside, the entire plate fits together, creating a roof similar to a corrugated metal roof. The thickness of the heat-shielding steel plate 5A is basically 0.27 mm, which is 60% lighter than typical textured materials that are 0.5 mm to 0.6 mm thick, significantly contributing to earthquake resistance.

[0028] Furthermore, the same heat-reflective steel sheet 5A can be used for slate roofs as well as 88-type corrugated metal roofs. Therefore, since there is no need to prepare heat-reflective steel sheet 5A that corresponds to the shape of the existing roofing material 2, the manufacturing cost of heat-reflective steel sheet 5A can be significantly reduced.

[0029] The material 6, which has a high reflectivity to radiant heat, such as aluminum foil, can be any material that has a high reflectivity to radiant heat. In this invention, the material 6, which has a high reflectivity to radiant heat, such as aluminum foil, has a reflectivity of 98%. Purity is important for a material to have high reflectivity, and in this invention, the material 6, which has a high reflectivity to radiant heat, such as aluminum foil, has a purity of 99.5% or higher. A thicker material is preferable, but in this invention, a thickness of 30 μm to 50 μm is used. Since the material 6, which has a high reflectivity to radiant heat, such as aluminum foil, is permeable and easily corroded by acid and alkaline components, it is important to use a material that has been surface-treated.

[0030] A ventilation layer 7 is formed between the existing roofing material 2 and the new roofing material, which is a heat-shielding steel plate 5A. In the case of a roof, it is preferable for air to flow laminarly along the new roofing material, but if there are horizontal underlayment members 3 etc., turbulence will be generated more, and there is a possibility that the heat received from the new roofing material will be supplied to the low-temperature parts on the interior side. In the heat-shielding roof structure 1 of the present invention, the height of the horizontal underlayment member 3 is kept to a minimum to suppress the generation of turbulence and prevent heat from being supplied to the interior side.

[0031] The mechanism of the heat-shielding roof structure 1 of the present invention will be explained in detail.

[0032] This invention relates to a double-layered roof structure in which a heat-shielding steel sheet 5A is installed on top of an existing roofing material 2 having an uneven surface, such as a slate roof, corrugated metal roof, or galvanized iron roof. To further reduce problems such as seismic resistance, the invention allows for the installation of the lightest possible flat-type heat-shielding steel sheet 5A. Furthermore, the same size heat-shielding steel sheet 5A can be used for any existing roofing material 2, and material costs can be significantly reduced.

[0033] First, multiple horizontal base members 3 are attached to the existing roofing material 2, which has an uneven surface, so as to extend in a direction Y perpendicular to the roof slope direction X. Then, vertical base members 4 are attached at regular intervals above these, so as to extend in the roof slope direction X. The horizontal base members 3 need to have a certain degree of strength to support the load of the roof, but since the underside of the horizontal base members 3 is supported by the existing roofing material 2, it is not necessary for them to be particularly large members. The main problem is the bolts 8 and nuts 9 protruding from the existing roofing material 2. Normally, the bolts 8 protruding from the nuts 9 are cut off so that the tips of the nuts 9 do not come into contact with the flat heat-shielding steel plate 5A. The height of the nuts 9 is usually about 5 mm to 6 mm, so the horizontal base members 3 can also be 5 mm to 6 mm thick.

[0034] The vertical base members 4 are hat-shaped and are fixed to the horizontal base members 3 with screws or the like. Furthermore, since the vertical base members 4 serve as a frame for fixing the heat-shielding steel plates 5A, it is important that they are installed at equal intervals. Also, since workers will be standing on the existing roofing material 2, it is necessary to ensure sufficient strength. To reinforce this strength, it is important that the ends of the vertical base members 4 and the heat-shielding steel plates 5A have the same shape so that they fit together.

[0035] The heat-shielding steel plate 5A is made by attaching a material 6 with high reflectivity against radiant heat, such as aluminum foil, to the back surface of a steel plate 5 using adhesive or other means. Attaching it by adhesive also improves the strength of the heat-shielding steel plate 5A, which is a positive factor in reducing its weight. To utilize this heat-shielding steel plate 5A as a new roofing material, one end of the heat-shielding steel plate 5A is processed to fit outside the hat-shaped vertical base member 4, while the other end is processed to abut against the top surface of the hat-shaped vertical base member 4. In other words, a new roof made of heat-shielding steel plate 5A can be constructed simply by dropping the heat-shielding steel plate 5A from the outdoor side of the adjacent vertical base member 4. Afterward, the heat-shielding steel plate 5A is fixed to the vertical base member 4 with screws from the horizontal direction.

[0036] A ventilation layer 7 is formed between the new roofing material, heat-shielding steel sheet 5A, and the existing roofing material 2, but wind resistance is a crucial factor. When turbulence occurs within the ventilation layer 7, high-temperature heat from the roof moves to the lower, cooler side below the roof. This invention minimizes this effect by reducing the height of the horizontal base member 3. As a result, the low radiance performance of the material 6, which has a high reflectivity to radiant heat such as aluminum foil, and the power of ventilation make it possible to save energy by more than 50% in general.

[0037] Next, the effects and benefits of the heat-shielding structure 1 of the roof according to this embodiment will be described.

[0038] In this embodiment, the roof heat-shielding structure 1 has multiple vertical base members 4 arranged at the same interval D in a perpendicular direction, so the heat-shielding steel plates 5A installed on the vertical base members 4 can be of the same size. This allows the same size heat-shielding steel plates 5A to be used on existing roofing materials 2 with different spacings of unevenness, thus enabling the standardization of the heat-shielding steel plates 5A.

[0039] In this embodiment, the heat-shielding structure 1 of the roof is provided with a material 6 that has a high reflectivity to radiant heat, such as aluminum foil, on the back side of the heat-shielding steel plate 5A, and a ventilation layer 7 is formed between the heat-shielding steel plate 5A and the existing roofing material 2. As a result, the indoor environment can be greatly improved, and energy saving can be achieved in the existing building.

[0040] The heat-shielding roof structure 1 according to this embodiment uses a heat-shielding steel plate 5A having a fitting portion 10 on one end for fitting a vertical base member 4, and a contact portion 11 on the other end that abuts against the top surface of an adjacent vertical base member 4. As a result, the heat-shielding steel plate 5A can be made lighter, reducing the load on the existing roofing material 2, and it can be used in places where seismic resistance is a concern, such as slate buildings.

[0041] In the heat-shielding roof structure 1 according to the present invention, since multiple vertical base members 4 are provided at the same interval D in the orthogonal direction Y, heat-shielding steel plates 5A of the same size can be used, and even if the existing roofing material has different spacing between irregularities, the same heat-shielding steel plates 5A can be used, thus enabling the standardization of heat-shielding steel plates 5A and significantly reducing the product price.

[0042] In the construction method for building the heat-shielding roof structure 1 according to this embodiment, the heat-shielding steel plate 5A is very light and easy to handle, so transportation and lifting costs can be significantly reduced. In addition, the new roofing material can be constructed on top of various existing roofing materials 2 with different spacing of protrusions and indentations.

[0043] Next, other embodiments will be described. In the roof heat shielding structure according to other embodiments, as shown in Figure 4, a material 6 with high reflectivity to radiant heat, such as aluminum foil, is provided on the horizontal base member 3, and a vertical base member 4 is installed on the material 6 with high reflectivity to radiant heat, such as aluminum foil. The structure is almost the same as the roof heat shielding structure 1 described above, except that the material 6 with high reflectivity to radiant heat, such as aluminum foil, is provided on the horizontal base member 3, so the explanation will be omitted. In this heat shielding structure, a steel plate 5 is used which does not have a material 6 with high reflectivity to radiant heat, such as aluminum foil, provided on its back surface.

[0044] Furthermore, in the roof heat-shielding structure according to another embodiment, as shown in Figure 5, a material 6 with high reflectivity to radiant heat, such as aluminum foil, is provided on the existing roof member 2, and a horizontal base member 3 is installed on the material 6 with high reflectivity to radiant heat, such as aluminum foil. The structure is almost the same as the roof heat-shielding structure 1 described above, except that the material 6 with high reflectivity to radiant heat, such as aluminum foil, is provided between the existing roof member 2 and the horizontal base member 3, so the explanation will be omitted. In this heat-shielding structure, a steel plate 5 is used which does not have a material 6 with high reflectivity to radiant heat, such as aluminum foil, provided on its back surface.

[0045] In the case of the roof heat-shielding structure shown in Figures 4 and 5, the same size heat-shielding steel plate 5A can be used, and the same heat-shielding steel plate 5A can be used even if the spacing of the unevenness of the existing roofing material is different. Furthermore, because a material 6 with high reflectivity against radiant heat, such as aluminum foil, is provided, and a ventilation layer 7 is formed, the indoor environment can be greatly improved, and energy savings can be achieved in existing buildings.

[0046] Although this embodiment has been described above, it is possible to select or replace the configurations listed in the above embodiment, or to change them to other configurations as appropriate, as long as they do not depart from the spirit of the present invention. [Explanation of Symbols]

[0047] 1. Heat-shielding structure of the roof 2 Existing roofing materials 3. Horizontal base members (first base members) 4. Vertical base members (second base members) 5 steel plate 5A heat shield steel plate 6. Materials with high reflectivity against radiant heat, such as aluminum foil. 7. Ventilation layer 8 volts 9 nuts 10 Fitting part 11 Contact part D interval X Roof slope direction Y-direction (orthogonal direction) Z vertical direction

Claims

1. A heat-shielding structure for a roof constructed on existing roofing material having an uneven surface, A first metal base member is provided, which is located above the existing roofing material and extends in a direction perpendicular to the roof slope direction of the existing roofing material. A second metal base member is located above the first base member and extends in the direction of the roof slope, A steel plate attached to the upper side of the second base member, having a fitting portion formed on one end for fitting the second base member from the outside, and a contact portion formed on the other end for contacting the top surface of the adjacent second base member, The steel plate and the existing roofing material are provided with a material that has a high reflectivity to radiant heat, such as aluminum foil, Multiple first base members are provided at intervals, and multiple second base members are provided at the same intervals in the orthogonal directions. A ventilation layer is formed between the steel plate and the existing roofing material. A roof heat-shielding structure characterized by the following features.

2. The aforementioned second base member is hat-shaped. The heat-shielding structure for a roof according to feature 1.

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