JP2022152417A - roof structure - Google Patents

Abstract

To provide a roof structure suppressing early deterioration of an existing roof material even while performing reinforcement by covering the existing roof material.SOLUTION: A roof structure is provided with: a plurality of furring strips 4 forming a first ventilation layer T1 placed on an inclined existing roof material 3 in an attitude along a ridge direction with a space in a span direction orthogonal to the ridge direction; new roof boards 5 installed on the plurality of furring strips 4; a ventilation material 6 in a sheet shape with a ventilation characteristic in an extent direction installed on the new boards 5 to form a second ventilation layer T2; a new roof material 7 installed on the ventilation material 6; and a ventilation part 8 arranged on a top part of the new roof material 7 to communicate the first ventilation layer T1 and the second ventilation layer T2 with the outside.SELECTED DRAWING: Figure 3

Description

The present invention relates to roof construction.

Roofing materials that make up roofs need to be repaired before they reach the end of their service life due to deterioration over time. Therefore, the existing roofing material is covered and reinforced by constructing a new roofing material on top of the existing roofing material without removing the existing roofing material (see, for example, Patent Document 1). .

Japanese Utility Model Publication No. 63-32246

In the roof structure of Patent Document 1, a waterproof sheet is placed on top of the sheathing board that constitutes the existing roof material, and a large number of long metal plates are laid on it at intervals in the inter-beam direction in a posture along the girder direction. to form a ventilation path between the long metal plates adjacent to each other in the inter-beam direction. Next, a cap material is bridged between the rising parts of each long metal plate via a hanger to form a rising connection part, and a hard substrate, a synthetic resin foam, and a sheet-like material are placed on the rising connection parts. A heat-insulating baseboard that integrates things is laid.

In the above roof structure, the heat from the sunlight can be prevented to some extent from being transferred to the existing roof materials by the heat insulating base plate and the ventilation path. The ground plate and ventilation passages are not adequate measures. In particular, existing old roofing materials, which have already started to deteriorate, will deteriorate at an early stage depending on the content of the countermeasures, and there is room for improvement.

SUMMARY OF THE INVENTION In view of the above situation, the present invention aims to provide a roof structure capable of suppressing early deterioration of the existing roofing materials while covering and reinforcing the existing roofing materials. It is.

In order to solve the above-mentioned problems, the roof structure of the present invention is installed on an existing roof material having a slope in a posture along the girder direction at intervals in the inter-beam direction perpendicular to the girder direction. a plurality of furring strips forming a furring strip, a new sheathing board installed on the plurality of furring strips, and a sheet-like sheet that is installed on the new sheathing board to form a second ventilation layer and has breathability in the spreading direction a new roofing material to be installed on the new roofing material; and a ventilation part for connecting the first ventilation layer and the second ventilation layer to the outside at the top of the new roofing material. It is characterized by having

According to the present invention, a plurality of furring strips are installed on an existing roofing material, and new sheathing boards are installed thereon for reinforcement. By constructing a new roofing material through the ventilation material, the existing roofing material can be covered and reinforced. Moreover, the air warmed by the sunlight moves upward through the first ventilation layer and the second ventilation layer and is discharged to the outside from the ventilation part, so the heat received by the new roofing material from the sunlight reaches the existing roofing material. It can be suppressed to be transmitted. Therefore, it is possible to suppress early deterioration of existing roof materials. In addition, the condensation water generated on the lower surface of the new roofing material moves to the new sheathing board through the ventilation material, moves downward from the new sheathing board, and can be discharged to the outside. It is possible to suppress deterioration due to putrefaction of

Further, in the roof structure of the present invention, the ventilation material may be provided with a sheet-like waterproof material at a position in contact with the new sheathing board.

As described above, by providing a sheet-like waterproofing material at the position in contact with the new sheathing board, the condensation water generated on the underside of the new roofing material moves to the waterproofing material through the ventilation material. It is possible to suppress direct transmission of dew condensation water to the ground plate. Therefore, it is possible to suppress deterioration of the new sheathing board due to rotting caused by dew condensation water generated on the lower surface of the new roof material.

Further, in the roof structure of the present invention, the waterproof material is made of a material having waterproofness and elasticity, and when a nail for fixing the new roof material to the new sheathing board is driven, the outer peripheral surface of the nail is may be configured to be in close contact with the

As described above, when the nails for fixing the new roofing material to the new sheathing board are driven in, the waterproofing material adheres to the outer peripheral surface of the nail, so that the waterproofing property of the waterproofing material can be maintained.

Further, in the roof structure of the present invention, a heat shield sheet may be arranged on the existing roof material.

As described above, if a heat shield sheet is placed on top of the existing roof material, the heat transfer to the existing roof material can be reduced by blocking the heat transmitted from the new roof material with the heat shield sheet. can be further suppressed.

Further, in the roof structure of the present invention, an opening for discharging air is formed in the top of the new roof material, and the ventilation part includes a cover part covering the upper part of the opening and attached to the upper surface of the new roof material on the top side. and a lower guide part for guiding the air that has moved upward from the opening to the eaves side with the cover part and discharging it to the outside.

As noted above, air moved to the top of the new roofing material moves upwards through the openings. The moved air can be guided to the eaves side by the cover portion and the lower guide portion and discharged to the outside.

According to the present invention, premature deterioration of the existing roofing material is prevented by providing two ventilation layers between the new roofing material and the existing roofing material while covering and reinforcing the existing roofing material. It is possible to provide a roof structure that can suppress the

FIG. 2 is a partially omitted perspective view showing the roof structure of the present invention so that the interior can be seen; It is a longitudinal cross-sectional view showing the underside of the eaves of the same roof structure. It is a longitudinal cross-sectional view showing the top side of the same roof structure. It is a longitudinal cross-sectional view of a second ventilation layer.

A roof structure according to an embodiment of the present invention will be described below with reference to the drawings. This roof structure is constructed by constructing a new roofing material on the existing roofing material without removing the existing roofing material. In this embodiment, a gable roof will be described as an example.

As shown in FIG. 3, the gable roof 1 is composed of a pair of roofs 2, 2 that slope downward from the top of the roof to the eaves on both sides. Since the pair of roofs 2, 2 have the same structure, one roof 2 will be described below.

As shown in FIGS. 1 to 3, the roof 2 is placed on the existing roof material 3 having a slope in a posture along the girder direction (inclination direction) in the inter-beam direction (width direction of the roof 2) perpendicular to the girder direction. A plurality of furring strips 4 that are installed at intervals to form the first ventilation layer T1, a structural plywood 5 that is a new sheathing board installed on the plurality of furring strips 4, and on the structural plywood 5 A three-dimensional net-like body 6 which is a ventilation material installed to form a second ventilation layer T2, a new roofing material 7 installed on the three-dimensional net-like body 6, and a first ventilation layer T1 and a second ventilation layer T1 on the top of the new roofing material 7. 2 and a ventilation part 8 for communicating the ventilation layer T2 with the outside. The first ventilation layer T1 and the second ventilation layer T2 communicate with the outside at the lower end of the roof. This roof structure suppresses the temperature rise of the roof 2 by utilizing natural ventilation in which an ascending air current is generated by the temperature difference, and the warm air is moved to the upper part of the roof by the ascending air current and discharged.

A waterproof material 9 (not shown in FIG. 1) is placed on the structural plywood 5 , and a three-dimensional net-like body 6 is placed on the waterproof material 9 . In addition, if the three-dimensional net-like body 6 is integrated on the waterproof material 9, both the waterproof material 9 and the three-dimensional net-like body 6 can be installed at the same time only by setting the waterproof material 9 on the structural plywood 5. can be done. As described above, by providing the first ventilation layer T1 and the second ventilation layer T2, the first ventilation layer T1 and the second ventilation layer T2 can be maintained even when a large amount of air heated by sunlight is generated at the edge of the eaves. can be smoothly guided upward through the Thereby, the temperature rise of the new roof material 7, the structural plywood 5, and the existing roof material 3 can be suppressed. The second ventilation layer T2 is set to have a vertical dimension longer than that of the first ventilation layer T1, but may be set to the same dimension.

The existing roofing material 3 is a decorative slate roofing material installed on the upper surface of the wooden sheathing board 10 . If the existing roofing material 3 is a plurality of roof tiles, all the roof tiles must be removed because the furring strip 4 cannot be stably installed.

As shown in FIG. 1, the sheathing board 10 is arranged on the rafters 11, and the wooden fascia board 12 is arranged on the eaves side end surface 11A of the rafters 11. As shown in FIG. Also, a metal fascia sheet metal 13 is vertically provided at the edge of the eaves side of the new roof material 7. - 特許庁Therefore, the air that is warmed by the sunlight and rises is guided upward by the outer end surface 12B of the fascia plate 12, guided by the inner surface 13A of the fascia sheet metal 13, and moves to the first ventilation layer T1 and the second ventilation layer T2. and move to the ventilation section 8.

Each furring strip 4 is, for example, a rectangular timber measuring 45 mm long and 15 mm wide. The depth (length in the direction of inclination) of each furring strip 4 is set to the distance from the edge of the eaves to the top of the roof. Then, as described above, by installing a plurality of furring strips 4 on the existing roof material 3 and installing the structural plywood 5 on the plurality of furring strips 4, the furring strips 4 adjacent in the inter-beam direction are installed. , 4, the existing roof material 3 and the structural plywood 5 form a first ventilation layer T1.

The structural plywood 5 is sized to cover the existing roof 3, and its thickness is set according to the size of the existing roof 3 (in this embodiment, it is set to 12 mm, for example). ).

The three-dimensional net-like body 6 is configured to have air permeability on the sheet in the spreading direction of the sheet. Specifically, as shown in FIG. 4, the three-dimensional net-like body 6 is formed by entangling and entangling a plurality of linear bodies 6A of synthetic resin (for example, polypropylene) that are twisted into an irregular shape. It is a three-dimensional object in which spaces are formed in all directions (the direction in which the sheet spreads) by joining the contact portions where the linear bodies contact each other. Condensed water generated on the lower surface 7A of the new roof material 7 moves to the waterproof material 9 via the three-dimensional net-like body 6 in contact with the lower surface 7A, thereby suppressing the transfer of the condensed water to the structural plywood 5. Therefore, it is possible to suppress deterioration of the structural plywood 5 due to rotting due to dew condensation water generated on the lower surface 7A of the new roof material 7 . Moreover, since the new roofing material 7 is made of metal, the three-dimensional mesh body 6 can absorb the expansion sound so as to reduce the expansion sound when the new roofing material 7 expands by receiving sunlight. Although the three-dimensional net-like body 6 is preferably made of synthetic resin, it may be made of other materials such as paper and, in some cases, metal. Moreover, the three-dimensional net-like body 6 may have a shape other than a net-like shape.

The waterproof material 9 is made of a material having waterproof properties and elasticity, and is configured to adhere closely to the outer peripheral surface of the nail (not shown) that fixes the new roof material 7 to the structural plywood 5 when the nail is driven. be. Therefore, when the nail for fixing the new roof material 7 to the structural plywood 5 is driven, the waterproof material 9 exerts an elastic restoring force and adheres to the outer peripheral surface of the nail. Thereby, the waterproof property of the waterproof material 9 can be maintained. Therefore, rainwater or the like is prevented from leaking from the waterproof material 9 to the structural plywood 5. - 特許庁

A heat shield sheet 14 (not shown in FIG. 1) is placed on the existing roof material 3 . Therefore, by shielding the heat transmitted downward from the new roof material 7 with the heat shield sheet 14, the heat transfer to the existing roof material 3 can be further suppressed.

The heat shield sheet 14 is composed of a porous sheet or nonwoven fabric made of a synthetic resin (for example, polyethylene) that reflects infrared rays, and has moisture permeability and waterproofness. Therefore, the heat shield sheet 14 discharges moisture from the existing roofing material 3 and prevents condensed water from entering the existing roofing material 3 . Moreover, it is possible to suppress the temperature rise of the existing roof material 3 by reflecting the infrared rays.

As shown in FIG. 3, the ventilation section 8 extends above a vertical opening S for discharging air formed between the top side end surfaces 2T, 2T of the pair of roofs 2, 2 (new roof materials 7, 7). A triangular covering portion 8A is attached to the upper surface of the pair of roofs 2, 2 (new roof materials 7, 7) on the top side, and the air that has moved upward from the opening S is guided to the eaves side by the covering portion 8A. and a pair of lower guide portions 8B, 8B for discharging to the outside. To the opening S, the air from the first ventilation layers T1, T1 and the second ventilation layers T2, T2 formed on the pair of roofs 2, 2 not only joins, but also the attic communicating with the opening S. Air from 15 also rises and joins. The cover portion 8A and the lower guide portions 8B, 8B are formed substantially parallel to the new roof materials 7,7. In addition, since the lower guide portions 8B, 8B have inclined portions bent obliquely upward at the eaves side end portions, the moved air can be discharged obliquely upward to the outside. A fan for forcibly sucking air may be provided in the ventilating section 8.

In addition, the present invention includes a roofing material reinforcement construction method for installing a new roofing material on an existing roofing material to reinforce the existing roofing material. In this roof material reinforcement method, a plurality of furring strips 4 are installed on an existing roof material 3 having a slope at intervals in the beam direction perpendicular to the girder direction in a posture along the girder direction to form the first ventilation layer T1. a structural plywood installation step of installing structural plywood 5 on the plurality of furrings 4, and a synthetic resin three-dimensional net-like body 6 on the structural plywood 5 a three-dimensional net-like body installing step of forming a second ventilation layer T2; a new roofing material-installing step of installing a new roof material 7 on the three-dimensional net-like body 6; and a ventilation section installation step of installing a ventilation section 8 for communicating the ventilation layer T1 and the second ventilation layer T2 with the outside.

Further, the roof material reinforcement construction method includes a waterproof material installation step of installing a waterproof material 9 on the structural plywood 5 . Furthermore, the roof material reinforcement construction method includes a heat shield sheet installation step of installing a heat shield sheet 14 on the existing roof material 3 .

The present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present invention.

In the above embodiment, a gable roof has been described. good too.

Moreover, although the new roof material 7 is made of metal in the above embodiment, it may be made of a material other than metal.

1... gable roof, 2... roof, 2T... top side end surface, 3... existing roof material, 4... furring strip, 5... structural plywood (new roofing board), 6... three-dimensional net body (ventilation material), 6A Linear body 7 New roof material 7A Lower surface 8 Ventilation part 8A Cover part 8B Lower guide part 9 Waterproof material 10 Roofing board 11 Rafter 11A Eaves side End surface 12 Fascia plate 12B Outer end surface 13 Fascia sheet metal 13A Inner surface 14 Heat shielding sheet 15 Attic S Opening T1 First ventilation layer T2 Second ventilation layer

Claims (5)

A plurality of furrings that are installed on an existing roof material having a slope and are spaced apart in a beam-to-beam direction orthogonal to the girder direction in a posture along the girder direction to form a first ventilation layer, and the plurality of furrings. A new sheathing board to be installed on top, a sheet-like ventilation material installed on the new sheathing board to form a second ventilation layer and having breathability in the spreading direction, and a new roof to be installed on the ventilation material and a ventilation part at the top of the new roof material for communicating the first ventilation layer and the second ventilation layer to the outside. 2. The roof structure according to claim 1, wherein said ventilation material comprises a sheet-like waterproof material at a position in contact with said new sheathing board. The waterproof material is made of a material having waterproof properties and elasticity, and is configured to adhere closely to the outer peripheral surface of the nail when the nail for fixing the new roof material to the new sheathing board is driven. The roof structure according to claim 2, characterized in that: The roof structure according to any one of claims 1 to 3, wherein a heat shield sheet is arranged on the existing roof material. An opening for discharging air is formed at the top of the new roofing material, and the ventilation part is attached to the upper surface of the top side of the new roofing material, and is moved upward from the opening. The roof according to any one of claims 1 to 4, further comprising: a lower guide part for guiding air to the eaves side with the cover part and discharging it to the outside. structure.

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