JP2012036649A - Heat insulating material for roof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating material for a roof, capable of preventing dew condensation while improving heat insulation performance of the roof.SOLUTION: A heat insulating material for a roof includes a fitting portion 25 which has a lateral dimension determined in such a manner that both side surfaces abut on opposed side surfaces of both rafters with predetermined pressure in incorporation, and a pair of folded portions 27 for forming a ventilation channel between the fitting portion 25 and a sheathing roof board. Each of the folded portions 27 comprises an extended sheet portion 28a which is formed by extending a top surface sheet 21 of the fitting portion 25, and an extended heat insulating layer portion 28b which is formed by using a heat insulating layer 23 bonded to an inner surface of the extended sheet portion 28a. The extended sheet portion 28a is folded back centering on a boundary portion B between the extended sheet portion 28a and the top surface sheet 21, and fixed to abut on the top surface sheet 21.

Description

The present invention relates to a heat insulating material for a roof of a house.

  12 to 14 show a roof structure of a general wooden house. In FIG. 12, 50 is a rafter, and 70 is a field board. The plurality of rafters 50 are arranged so as to extend from the eaves of the house to the ridge, and the field board 70 is provided on these rafters 50. Then, roofing material 74 such as roofing and tiles is constructed on the field plate 70. Reference numeral 75 denotes a building ventilation hole.

  In current wooden houses, it is desired to provide ventilation and heat insulation to the roof structure from the viewpoint of improving the living environment and roof durability. Therefore, as shown in FIGS. 13 and 14, a heat insulating material 60 such as a polystyrene foam plate is provided between adjacent rafters (50, 50), and in order to prevent condensation due to heat insulation, the heat insulating material 60. A ventilation cavity (ventilation cave) 65 is formed between the upper surface of the base plate 70 and the base plate 70 (see, for example, Patent Documents 1 and 2).

This cavity 65 (ventilation cave) is penetrated from the eaves to the ridge, and air flows through the ventilating cave (65). The heat insulating material 60 is fitted between the adjacent rafters (50, 50) using the elastic restoring force.
JP-A-9-144156 JP 2005-105532 A

  By the way, in the roof structure represented by the above-described Patent Documents 1 and 2, when the elasticity of the heat insulating material 60 is weakened due to secular change, a gap is generated between the rafter 50 and the heat insulating material 60, and dew condensation water is generated in the gap. The roof member such as the rafter 50 is accumulated and decayed to reduce the structural strength of the entire roof, and the heat insulation performance is lowered. Further, as described above, forming the groove for forming the air vent (65) in the heat insulating material 60 reduces the heat insulating performance and takes time and effort for the processing.

Generally, the heat insulating material (60) for the roof has a sandwich structure. That is, as shown in FIG. 15, the heat insulating material for roof (60) has an upper sheet 61 and a lower sheet 62 arranged in parallel in a mold 80 composed of an upper mold 81 and a lower mold 82, and the two sheets ( 61, 62) is produced by injecting a foamed plastic such as polystyrene from an injection port 83 disposed between them and forming a heat insulating layer (63) (for example, JP-A-2000-271944). In order to form the groove in this manufacturing stage, a special upper die 81 must be prepared, which increases processing costs and labor. As another method, it is conceivable to form the groove by removing the central portion of the flat upper surface sheet 61 after the heat insulating material 60 is made so that both sheets (61, 62) are flat. Such a processing method leads to a decrease in heat insulation performance and durability.
The objective of this invention is providing the heat insulating material for roofs which can prevent dew condensation, improving the heat insulation performance of a roof.

  In order to achieve the above object, the invention of claim 1 comprises one sheet and the other sheet arranged in parallel, and a heat insulating layer made of foamed plastic that is disposed between both sheets and adhered to the inner surface of each sheet, In a heat insulating material for a roof that is built in between the opposite side surfaces of adjacent rafters so that a ventilation cave is formed between it and the path plate, both sides of the opposite side surfaces come into contact with each other at a predetermined pressure when installed. And a pair of folded portions for forming an air passage between the fitted portion and the path plate, and the folded portions are arranged on the fitting portion. On the other hand, it consists of an extended sheet portion formed by extending the sheet in the lateral direction, and an extended heat insulating layer portion formed using the heat insulating layer bonded to the inner surface of the extended sheet portion, and the extended sheet portion is Boundary part with the one sheet It folded back around the those characterized by comprising fixed so as to be in contact with the said contrast seat.

  In the first aspect of the invention, when the fitting portion of the heat insulating material according to the present invention is fitted between the adjacent rafters, the space surrounded by both folded portions of the heat insulating material, one sheet of the fitting portion, and the field plate A space is formed. The eaves side and the building side of this empty space are opened. Therefore, this empty space becomes a cave (that is, a ventilation cave) through which air flows. The ventilation tunnel reduces the temperature difference generated in the member used for the roof and plays a role of ventilation. As a result, condensation is effectively prevented.

Here, the heat insulating material is generally a sandwich structure in which a heat insulating layer made of foamed plastic is sandwiched between both sheets arranged in parallel, but in the conventional example (FIGS. 13 and 14), the central portion of the top sheet. If the groove is not provided and the groove is not provided, the above-described vent can not be formed and the heat insulation performance is deteriorated, but in the present invention, the heat insulation layer is rather the amount of the folded portion without reducing the thickness. The ventilation cavity can be formed in a state where the thickness of the air gap is increased. Therefore, the heat insulation performance can be effectively increased.
Moreover, since not only a fitting part but both the folding | returning parts have a heat insulation layer and press a rafter with the elastic force, it is prevented more effectively that a clearance gap produces between the said rafters.

Moreover, even if for some reason, condensation occurs in a part of the air vent (for example, the lower surface of the field plate) and the condensed water enters between the one sheet of the fitting portion and the folded portion, Since the extension sheet portion of the folded portion is formed by extending one sheet, there is no break and it does not enter the rafter.
The invention according to claim 2 is the heat insulating material for roof according to claim 1, wherein a height dimension of the extended heat insulating layer portion is determined so as to come into contact with the path plate with a predetermined pressure.

  In the invention of the second aspect, in addition to the same effect as the invention of the first aspect, as described above, the heat insulating material according to the present invention is compressed in the lateral direction when fitted between adjacent rafters. The fitting is performed in a state where the outward elastic restoring force is easy to work, but both the folded portions are further compressed in the vertical downward direction with a predetermined pressure by the field plate. Therefore, an outward lateral elastic restoring force corresponding to the Poisson's ratio is also generated in both folded portions. For this reason, both side surfaces and both folded portions of the fitting portion are strongly adhered to the side surfaces of both rafters and no gap is generated. Therefore, even if the elasticity of the heat insulating material (fitting part, both folded parts) decreases due to secular change or the like, no gap occurs at the contact point between the heat insulating material and the rafter, and the occurrence of condensation is more effectively prevented. .

  According to the present invention, in a heat insulating material having a sandwich structure in which a heat insulating layer is sandwiched between both sheets, a fitting portion to be fitted between adjacent rafters at the time of roof construction, and one sheet of the fitting portion in the lateral direction And an extended heat insulating layer formed by using a heat insulating layer bonded to the inner surface of the extended sheet, and the extended sheet is a boundary portion with one sheet. And is fixed so as to be in contact with the one sheet, so that when the fitting part is fitted between the rafters, both the folded part of the heat insulating material and the one sheet of the fitting part In addition, an empty space (ventilation cave) surrounded by the base plate is formed, and the temperature difference generated in the member used for the roof is mitigated by the vent cave and is well ventilated. Further, it is not necessary to form a groove by removing a part of the heat insulating layer of the heat insulating material (a heat insulating material having a sandwich structure) that is frequently used in order to form a vent, and therefore the heat insulating performance is not deteriorated. Rather, in the present invention, the air passage can be formed in a state where the thickness of the heat insulating layer is increased by the amount of the folded portion. Therefore, heat insulation performance can be improved. Moreover, since not only the fitting part but also the folded parts have heat insulating layers and press both rafters with their elastic force, it is more effectively prevented that a gap is formed between both rafters. As a result, condensation can be prevented while improving the heat insulating performance of the roof.

  As shown in FIG. 11, the roof structure of a house in which the heat insulating material for roof according to the present invention is used is adjacent to a plurality of rafters 10 arranged so as to extend from the eaves of the house to the ridge. Insulating material 20 fitted between the rafters (10, 10) and a field board 40 provided on each rafter 10, and as shown in FIG. 10) It is set as the structure which the protrusion (27) for ventilating cavity appears when it fits between. As shown in FIG. 11, a roofing material 45 such as roofing and tiles is applied on the field board 40. Reference numeral 75 denotes a building ventilation hole.

  In this embodiment, each rafter 10 has a letter shape with an inverted vertical cross section T as shown in FIGS. 2 and 5. That is, each rafter 10 includes a rectangular portion 11 having a rectangular longitudinal section and a flange portion 15 below the rectangular portion 11 and wider than the rectangular portion 11. Here, the first height of the rafter 10 (that is, the length from the bottom surface 16 of the flange portion 15 to the upper surface 13 of the rectangular portion 11 shown in FIG. 10) H1, and the second height (rectangular shape from the upper surface 17 of the flange portion 15). The length (up to the upper surface 13 of the portion 11) H2 and the like are calculated based on the size of the roof and the like. Similarly, the longitudinal length of the rafter 10 (the length from the eaves side end surface 19a to the ridge side end surface 19b in FIG. 5) is also calculated based on the size of the roof and the like.

  Next, as shown in FIG. 1, the heat insulating material for roof 20 is composed of an upper surface sheet 21, a lower surface sheet 22, and a heat insulating layer 23 sandwiched between both sheets (21, 22). The upper surface sheet 21 is made of a thin plate-like plastic that can be bent at an arbitrary portion and has a high waterproof property, and is opposed to the lower surface sheet 22 in parallel. The bottom sheet 22 has the same configuration as the top sheet 21. The heat insulation layer 23 is made of foamed plastic (for example, polystyrene), and is firmly bonded to the inner surfaces of the two sheets (21, 22). This heat insulation layer 23 is a part which mainly exhibits a heat insulation function. When the roof heat insulating material 20 is manufactured, the distance between the two sheets (21, 22) (that is, the length from the upper surface of the upper surface sheet 21 to the lower surface of the lower surface sheet 22) H10 is the second of the rafter 10. The height is selected to be shorter than the height H2 by a predetermined length β (for example, 2 mm).

  As shown in FIG. 4, the roof heat insulating material 20 includes a fitting portion 25 that is fitted between adjacent rafters (10, 10) when the roof is assembled, and a space between the fitting portion 25 and the field plate 40. And a pair of folded portions (27, 27) for forming the air vent 39.

  More specifically, the fitting portion 25 of the roof heat insulating material 20 has a lateral direction (width direction) length L10 that is a predetermined length α (than the interval L0 between the corresponding rafters (10, 10). For example, it is formed to be long by 2 mm). In addition, the space | interval L0 between both rafters (10,10) means the distance between the side surfaces 12 which each rectangular part (11,11) opposes.

Further, as shown in FIG. 9, the pair of folded portions (27, 27), which is a characteristic portion of the heat insulating material for roof 20, is formed by extending one sheet (here, the upper surface sheet 21) of the fitting portion 25. The extended sheet portion 28a and the extended heat insulating layer 28b formed by using the heat insulating layer (23) bonded to the inner surface of the extended sheet portion 28a, the extended sheet portion 28a being the upper surface sheet. 21 is folded around a boundary portion B with the center 21 and fixed so as to contact the one sheet 21.
(Specific formation method of the above-mentioned heat insulating material for roof 20)

(1) In order to form the fitting part (25) and the folded parts (27, 27) on both sides, a roof heat insulating material forming material 20A shown in FIG. 6 is prepared. In addition, since the manufacturing method of the heat insulating material forming material 20A for the roof is the same as the method disclosed in Japanese Patent Laid-Open No. 2000-271944 described in the section of the problem to be solved by the invention, the details thereof are omitted.
(2) This roof heat insulating material forming material 20A is cut into a length in the lateral direction (length in the width direction) of L10 + 2 × L11.

(3) As shown in FIG. 7, the roof heat insulating material forming material 20A formed in the above (2) is a rectangular parallelepiped portion having a length L11 from the side surface 24A and a bottom surface (H10-H11) (in FIG. 7). Cut out the two-dot chain line part).

(4) Next, as shown in FIGS. 8 and 9, the top sheet (21A) has a predetermined depth of the roof heat insulating material forming material 20A along the side surface (24B) that appeared in the cutting operation of (3) above. Cut until cut to t1 (in this embodiment, half the thickness t). The cut depth of the roof heat insulating material forming material 20A is determined by the ease with which the sheet 21A can be bent. That is, when the sheet 21A has high rigidity and is difficult to bend, the cut amount is increased, and when the sheet 21A is easily bent, the cut amount is decreased. When the top sheet 21A is particularly easy to bend, the sheet 21A may be cut so as not to be cut at all. By such a cutting operation, a material (27) serving as a folded portion having a rectangular cross section (width L11 and height H11) is formed in the upper part of both side surfaces 26 of the fitting portion 25.

(5) Next, the folded portion material (27) is folded around the boundary portion B with the top sheet 21 and fixed so as to contact the top sheet 21. In this embodiment, the extension sheet | seat part 28a of the folding | returning part raw material (27) and the upper surface sheet | seat 21 of the fitting part 25 were fixed using the adhesive agent.
The roof heat insulating material 20 is formed by the above forming operations.
(Roof construction)

  When a roof is constructed using the rafter 10 and the roof heat insulating material 20 as described above, the fitting portion 25 of the roof heat insulating material 20 is fitted between adjacent rafters (10, 10) as shown in FIG. .

  In this state, as shown in FIG. 3, the field board 40 is placed on both folded portions (27, 27) of the roof heat insulating material 20, and the field board 40 is attached to the rafter 10 with a fixing member such as a nail 43. To fix. Thereafter, roofing material 45 such as roofing and tiles is applied on the base plate 40.

  When the roof is constructed in this way, an empty space surrounded by both folded portions (27, 27) of the heat insulating material for roof 20, the upper surface sheet 21 of the fitting portion 25, and the field plate 40 is formed. This empty space penetrates from the eaves of the house to the ridge, and forms a cave (that is, a ventilation cave 39) through which air flows, as shown in FIG. The temperature difference generated in the member used for the roof is relaxed by the ventilation tunnel 39, and it plays a role of ventilation, and as a result, condensation is effectively prevented.

  Here, as described in the background art section, the heat insulating material for the roof is generally a sandwich structure in which a heat insulating layer made of foamed plastic is sandwiched between the two sheets arranged in parallel, but in the conventional example, If the central portion of the upper surface of the heat insulating material is removed and no groove is provided, the air passage (39) cannot be formed, resulting in a decrease in the volume of the heat insulating layer, resulting in a decrease in heat insulating performance. Without reducing the thickness, the air passage 39 can be formed in a state where the thickness of the heat insulating layer is increased by the amount of the folded portions (27, 27). Therefore, the heat insulation performance can be effectively increased.

  Furthermore, for some reason, dew condensation occurs in a part of the air vent 39 (for example, the lower surface of the field plate 40), and the dew condensation water enters between the upper surface sheet 21 and the folded portion 27 of the fitting portion 25. Even if it can be done, the extension sheet portion 28 a of the folded portion 27 is formed by extending the top sheet 21, so there is no break and it does not enter the rafter 10.

  In addition, when the heat insulating material for roof 20 is fitted between the adjacent rafters (10, 10), the roof is compressed in the lateral direction, and the outward elastic restoring force is easily fitted. Furthermore, since the elastic restoring force in the horizontal direction according to the Poisson's ratio is generated as a result of being compressed in the vertical direction by the field plate 40, the side surface 26 of the roof heat insulating material 20 and the side surface 12 of the rectangular portion 11 of the rafter 10 are strongly Adhering to each other, there is no gap. Therefore, the occurrence of condensation at the location is prevented. Furthermore, in the heat insulating material 20 for the roof, since the height dimension is determined so as to come into contact with the field plate 40 with a predetermined pressure, both the folded portions (27, 27) are applied at a predetermined pressure by the field plate 40. It is shrunk vertically downward.

  Therefore, an outward lateral elastic restoring force corresponding to the Poisson's ratio is also generated in both folded portions (27, 27). Therefore, both side surfaces of the fitting portion 25 and both folded portions (27, 27) are strongly adhered to the side surfaces of both rafters (10, 10), and no gap is generated. Therefore, even if the elasticity of the heat insulating material 20 for the roof (the fitting portion 25 and the two folded portions 27) is lowered due to secular change or the like, there is no gap at the contact portion between the roof heat insulating material 20 and the rafter 10 and condensation occurs. Generation is more effectively prevented.

It is a front view which shows the heat insulating material for roofs concerning this invention. It is a figure which shows the positional relationship of the folding | turning part of a heat insulating material for roofs, and a rafter. It is a figure (1) for demonstrating incorporation of the heat insulating material for this roof. It is a figure (2) for demonstrating incorporation of the heat insulating material for this roof. It is a perspective view for demonstrating a rafter. It is a figure (1) for demonstrating the formation method of the heat insulating material for roofs. It is a figure (2) for demonstrating the formation method of the heat insulating material for roofs. It is a figure (3) for demonstrating the formation method of the heat insulating material for roofs. It is a figure (4) for demonstrating the formation method of the heat insulating material for roofs. It is a figure for demonstrating the modification of the heat insulating material for roofs. It is a figure for demonstrating the whole structure of a roof. It is a figure (1) for demonstrating the conventional roof structure. It is a figure (2) for demonstrating the conventional roof structure. It is a figure (3) for demonstrating the conventional roof structure. It is a figure for demonstrating the method to manufacture the heat insulating material for roofs.

DESCRIPTION OF SYMBOLS 10 Rafter 11 Rectangular part 12 Side surface 13 Upper surface 14 Inner corner 15 Ridge part 16 Bottom surface 17 Upper surface 20 Roof heat insulating material 20 Roof heat insulating material forming material 21 Upper surface sheet 22 Lower surface sheet 23 Heat insulating layer 24 Side surface 25 Fitting part 26 Side surface 27 28a Extension sheet part 28b Extension heat insulation layer 39 Venting tunnel 40 Field plate 43 Nail (fixing member)

Claims (2)

One sheet and the other sheet arranged in parallel, and a foamed plastic heat insulating layer disposed between the two sheets and adhered to the inner surface of each sheet, and adjacent to each other so that a vent is formed between the path plate In roof insulation that is built in between the opposite sides of mating rafters,
A fitting portion whose lateral dimension is determined so that the opposite side surfaces of the two rafters abut against each other at a predetermined pressure at the time of assembling, and for forming a ventilation cavity between the fitting portion and the field plate It consists of a pair of folded parts,
The folded portions are formed by using the extended sheet portion formed by extending one sheet of the fitting portion in the lateral direction and the heat insulating layer bonded to the inner surface of the extended sheet portion. A heat insulating material for a roof comprising a layer part, and an extension sheet part thereof is folded around a boundary part with the one sheet and fixed so as to come into contact with the one sheet.   The roof heat insulating material according to claim 1, wherein a height dimension of the extended heat insulating layer portion is determined so that the extended heat insulating layer portion comes into contact with the path plate with a predetermined pressure.

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