JP7530210B2 - How to install the roofing material set - Google Patents

Description

The present invention relates to a roofing material, a roofing material set, a construction structure for the roofing material set, and a construction method for the roofing material set.

Patent Document 1 discloses a pre-cut tile roofing method. In this pre-cut method, tiles are cut in advance at a factory to produce corner tiles, which are then brought to the roof site and laid on top of the roofing boards.

JP 2006-104719 A

In the precut tile roofing method described above, the shape of the corner tiles produced varies for each tier. This requires the production of multiple types of corner tiles with different shapes, which is time-consuming. Furthermore, during construction, it is necessary to select a corner tile with an appropriate shape from multiple types of corner tiles for each tier, which is time-consuming.

The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide a method for installing a roofing material set that is easy to manufacture and easy to install.

The roofing material according to one aspect of the present invention is a roofing material that is staggered on the base surface adjacent to the corner ridge, and the angle θ of the corner ridge relative to the horizontal direction, the working width B of the roofing material, and the working length L of the roofing material satisfy the following formula 1.

The roofing material set according to one aspect of the present invention comprises a plurality of roofing materials that are staggered on the base surface adjacent to the corner ridge. The plurality of roofing materials include a plurality of normal roofing materials that do not follow the corner ridge, and a plurality of corner roofing materials that follow the corner ridge. Each of the plurality of normal roofing materials is a roofing material that satisfies formula 1. For each of the plurality of corner roofing materials, the angle of the edge on the corner ridge side with respect to the horizontal direction is the same as the angle θ. The plurality of corner roofing materials are the same in shape and size.

The construction structure of the roofing material set according to one aspect of the present invention is a construction method for the roofing material set, in which the plurality of normal roofing materials and the plurality of corner roofing materials are constructed in sequence from the belowwater side to the abovewater side.

The method for constructing a roofing material set according to one aspect of the present invention is a method for constructing the roofing material set, in which the roof slope, the working width B, and the working length L are selected from any two of these three based on a relational equation, and the remaining one is selected, and the multiple roofing materials are constructed.

In the method for installing a roofing material set according to the one aspect, the roofing material can be easily produced and the roofing material can be easily installed.

FIG. 1 is a plan view of a roof structure according to an embodiment of the present invention. FIG. 2 is a plan view showing a part of the roof structure. FIG. 3 is a perspective view showing how the first layer of roof material is being installed in the roof structure. FIG. 4 is a perspective view showing the construction of a second layer of roof material for the roof structure. FIG. 5 is a plan view showing the state in which the roof material of the above roof structure has been installed up to the second layer. FIG. 6 is a perspective view of a normal roof material included in the above roof structure.

(1) Embodiment The present invention relates to a roofing material to be applied to a base surface adjacent to a corner ridge, a roofing material set including this roofing material, and an installation structure and installation method for this roofing material set.

Figure 1 shows a roof structure 1, which is a construction structure for the roof material set 3 of this embodiment. The building to which this roof structure 1 is applied is, for example, a residential building where people live. Note that the building may be a non-residential building such as a store, factory, or warehouse, in addition to a residential building.

The roof structure 1 of this embodiment forms a hipped roof and has one ridge 10 and four corner ridges 11. Note that the roof formed by the roof structure 1 need only be a roof with corner ridges and is not limited to a hipped roof. The roof formed by the roof structure 1 may be, for example, a square roof or a gabled roof.

The roof structure 1 comprises a roof underlayment 2 (see FIG. 3) and a roofing material set 3. The roofing material set 3 comprises a plurality of roofing materials 30, 31. The plurality of roofing materials 30, 31 are laid on a base surface 20 that constitutes the upper surface of the roof underlayment 2. The roof underlayment 2 has a plurality of base surfaces 20 adjacent to each other via a ridge 11. In this embodiment, the roof underlayment 2 has four base surfaces 20. Each base surface 20 is a portion between two adjacent corner ridges 11 on the upper surface of the roof underlayment 2. Of the four base surfaces 20, two of the base surfaces 20 are trapezoidal, and the remaining two base surfaces 20 are triangular.

As shown in FIG. 2, for each base surface 20, the two directions toward the underwater side (eaves side) and the abovewater side (opposite the eaves) are defined as "vertical directions." For each base surface 20, the two directions that are perpendicular to the vertical direction and are horizontal and opposite to each other are defined as "horizontal directions."

As shown in FIG. 1, of the two adjacent base surfaces 20 separated by a corner ridge 11, the horizontal direction of one base surface 20 is perpendicular to the horizontal direction of the other base surface 20 when viewed from above. When viewed from above, each corner ridge 11 forms an angle of 45° with the horizontal direction of the adjacent base surface 20. In the following, as shown in FIG. 2, of the two adjacent corner ridges 11 on each base surface 20, the corner ridge 11 located on the right side is referred to as the first corner ridge 111, and the other corner ridge 11 located on the left side is referred to as the second corner ridge 112.

The roof foundation 2 of this embodiment has a sheathing board 21 and underlayment material 22 (see Figure 3). The sheathing board 21 is inclined so that the part closer to the water side is positioned lower.

As shown in FIG. 3, an underlayment (waterproof sheet) 22 is laid on the top surface of the sheathing board 21. The underlayment 22 is, for example, a synthetic polymer-based underlayment material or asphalt roofing (including asphalt felt and modified asphalt roofing). The underlayment 22 runs along the top surface of the sheathing board 21.

The roof underlayment 2 of this embodiment further includes a plurality of battens 23. The plurality of battens 23 are arranged at intervals in the vertical direction along the upper surface of the underlayment 22. The plurality of battens 23 are located above the sheathing boards 21 via the underlayment 22. Each batten 23 is formed in the shape of a rectangular column extending in the horizontal direction.

Each batten 23 is formed from a wood-based material such as a wood-plastic composite material. Each batten 23 is fixed to the sheathing board 21 by, for example, a number of fasteners (not shown) that penetrate the batten 23 and the underlayment 22. The fasteners for fixing each batten 23 to the sheathing board 21 are, for example, nails or screws. In this embodiment, the upper surface of the underlayment 22 and the surfaces of the multiple battens 23 form the base surface 20. The slope of the base surface 20 along the upper surface of the sheathing board 21 is the roof slope. The slope of the upper surface of the sheathing board 21 can also be considered the roof slope.

As shown in FIG. 2, multiple roofing materials 30, 31 are laid on each base surface 20 in a staggered pattern. In this specification, staggered roofing means that adjacent roofing materials 30, 31 are laid horizontally with a shift of half the working width B of each roofing material 30, 31 (half-cut size). Each roofing material 30, 31 is a flat horizontal roofing material, and is manufactured, for example, by forming a cement-based molding material and curing and hardening it.

In this embodiment, the roofing materials 30, 31 arranged horizontally on each base surface 20 are laid in order from the roofing material 31 located on the first corner ridge 111 side (right side) to the second corner ridge 112 side (left side), and the roofing materials 30, 31 arranged vertically on each base surface 20 are laid in order from the roofing material 30, 31 located below the water surface to the above the water surface (in this embodiment, from the eaves to the ridge).

On each base surface 20, the multiple roofing materials 30, 31 are laid in such a manner that the end of the roofing material 30, 31 located on the second corner ridge 112 side of the horizontally adjacent roofing materials 30, 31 on the first corner ridge 111 side overlaps the end of the roofing material 30, 31 located on the first corner ridge 111 side on the second corner ridge 112 side (see Figures 3 and 4). Also, on each base surface 20, the multiple roofing materials 30, 31 are laid in such a manner that the underwater edges of the horizontally adjacent roofing materials 30, 31 are aligned vertically. Note that the multiple roofing materials 30, 31 may be laid in such a manner that the end faces of the horizontally adjacent roofing materials 30, 31 are butted against each other. In this case, the multiple roofing materials 31 may be laid in order, for example, starting from the roofing material 31 located on the second corner ridge 112 side (left side) toward the first corner ridge 111 side, or starting from the roofing material 31 located in the center in the horizontal direction toward the first corner ridge 111 side and the second corner ridge 112 side.

On each base surface 20, multiple roofing materials 30, 31 are laid in such a way that the belowwater end of the upper roofing material 30, 31 of vertically adjacent roofing materials 30, 31 overlaps the abovewater end of the lower roofing material 30, 31 (see Figure 4).

As shown in FIG. 5, the upper surface of each roofing material 30, 31 has a non-exposed portion 32 that is covered by the adjacent roofing material 30, 31 and is not exposed, and an exposed portion 33 that is not covered by the adjacent roofing material 30, 31 and is exposed. The non-exposed portion 32 is composed of the above-water end of the upper surface of the roofing material 30, 31 that is covered by the roofing material 30, 31 located above the water and the end on the second corner ridge 112 side that is covered by the roofing material 30, 31 located next to the second corner ridge 112 side (left side). The exposed portion 33 is the other part of the upper surface of the roofing material 30, 31 excluding the non-exposed portion 32. The working length L of the roofing material 30, 31 is the vertical dimension of the exposed portion 33. The working width B of the roofing material 30, 31 is the horizontal dimension of the exposed portion 33.

When the roofing materials 30, 31 are thick, a waterproof shape can be added to the surface of the roofing materials 30, 31. Examples of this shape include a dam protruding to the surface side of each of the above-water edge and the second corner ridge 112 edge of the roofing materials 30, 31. Therefore, when the roofing materials 30, 31 are thick, the working length L and working width B of each roofing material 30, 31 can be fine-tuned while ensuring waterproofing. The roofing materials 30, 31 may be thin. As shown in Figures 3 and 4, each roofing material 30, 31 is fixed to the roofing foundation 2 by fixing the non-exposed portion 32 to the roofing foundation 2 with multiple fasteners 12. Specifically, each roofing material 30, 31 is fixed to two adjacent battens 23 in the vertical direction by multiple fasteners 12 at the above-water end and the below-water portion at the end on the second corner ridge 112 side. In this case, the fastener 12 is, for example, a nail or screw that passes through the roofing materials 30, 31 and is driven into the crosspiece 23.

Of two vertically adjacent roofing materials 30, 31, the upper roofing material 30, 31 may have only its above-water end fixed to the batten 23 by the fastener 12. In this case, the end of the upper roofing material 30, 31 on the second corner ridge 112 side may be fixed to the above-water end of the lower roofing material 30, 31 by a fastener such as a clip. Also, the multiple battens 23 may be omitted. In this case, each roofing material 30, 31 is, for example, arranged along the upper surface of the underlayment 22 and fixed to the roof foundation 2 by a fastener driven through the roofing material 30, 31 and the underlayment 22 into the sheathing board 21.

As shown in FIG. 1, the roof structure 1 includes a plurality of regular roofing materials 30 and a plurality of corner roofing materials 31 as the plurality of roofing materials 30, 31. As shown in FIG. 2, the regular roofing materials 30 are laid on the other parts of each base surface 20 except for both lateral ends, and do not run along any of the corner ridges 11. The corner roofing materials 31 are laid on both lateral ends of each base surface 20, and run along the corner ridges 11. In other words, there are two types of roofing materials: the corner roofing materials 31 that run along the corner ridges 11, and the regular roofing materials 30 that do not run along the corner ridges 11, and the roofing material set 3 includes a plurality of regular roofing materials 30 and a plurality of corner roofing materials 31.

The multiple regular roofing materials 30 have the same shape and size. Note that "same" in this specification does not require strict identity, but rather it is sufficient to be considered the same in the relevant field.

6, the normal roofing material 30 is flat and rectangular in plan view extending horizontally. The normal roofing material 30 has an above-water edge 300, an under-water edge 301, an edge 302 on the first corner ridge 111 side, and an edge 303 on the second corner ridge 112 side. The above-water edge 300 and the under-water edge 301 of the normal roofing material 30 are each straight line parallel to the horizontal direction. The first corner ridge 111 side edge 302 and the second corner ridge 112 side edge 302 of the normal roofing material 30 are each straight line parallel to the vertical direction. Each normal roofing material 30 is installed on the roof foundation 2 so that the working width B is the same and the working length L is the same. The shape of the normal roofing material 30 is not limited to the shape of this embodiment. The normal roofing material 30 may be formed, for example, in a hexagonal flat plate shape.

The corner roof material 31 is flat and, as shown in FIG. 5, has a trapezoidal shape in plan view. The corner roof material 31 has an above-water edge 310, an underwater edge 311, an edge 312 on the first corner 111 side, and an edge 313 on the second corner 112 side.

The above-water edge 310 and the below-water edge 311 of the corner roof material 31 are parallel to the horizontal direction. The edges 312 and 313 of the corner roof material 31 located on the opposite side to the adjacent corner ridge 11 are parallel to the vertical direction. The edges 312 and 313 of the corner roof material 31 located on the side of the adjacent corner ridge 11 are inclined with respect to the vertical direction so as to follow the adjacent corner ridge 11. Note that the below-water edges 301, 311 of the normal roof material 30 and the corner roof material 31 may not be parallel to the horizontal direction.

The corner roofing material 31 is laid on the roof underlayment 2 so that the working length L is the same as that of the normal roofing materials 30 arranged horizontally. The angle α of the edge of the corner roofing material 31 on the side of the adjacent corner ridge 11 in the horizontal direction is the same as the corner ridge angle θ, which is the angle of the corner ridge 11 in the horizontal direction. The corner ridge angle θ can be calculated from the roof slope of the roof on which the corner roofing material 31 is installed. For example, if the roof slope is 2.5 sun slope, the corner ridge angle θ is 45.87°. The corner ridge angle θ is not limited, but it is preferable that it be 45° or more so that the corner ridge 11 does not form a valley.

The corner roof material 31 is made, for example, from the base material 4. The base material 4 has, for example, the same shape and size as the normal roof material 30 shown in FIG. 6. In other words, the normal roof material 30 can be used as the base material 4. Note that the base material 4 may have a different shape or size from the normal roof material 30.

The corner roof material 31 is produced, for example, by cutting one or both lateral ends of a raw material 4 that has the same shape and size as the regular roof material 30 using a cutting machine such as a manual cutter or an electric cutter, or a tile hammer, etc.

As shown in FIG. 2, the roof structure 1 of this embodiment includes a plurality of precut materials 34 and a plurality of cut materials 35 as a plurality of corner roof materials 31. Note that in FIG. 2, dots are added to each of the precut materials 34 and the cut materials 35 so that the precut materials 34 and the cut materials 35 can be easily understood, but the actual precut materials 34 and the cut materials 35 are not added with dots.

The multiple precut materials 34 have the same shape and size. The multiple precut materials 34 are laid along the first corner ridge 111 on each base surface 20. Each precut material 34 is installed on the roof base 2 so that the working width B is the same for each material and the working length L is the same for each material. The working width B of the precut material 34 is the maximum horizontal dimension of the exposed portion 33.

The pre-cut material 34 is produced by pre-cutting the raw material 4. This eliminates the need to produce the corner roof material 31 along the first corner ridge 111 at the construction site, reducing the workload of workers. In addition, no waste material is generated at the construction site due to cutting the raw material 4, which reduces the workload of disposing of waste material at the construction site. In this specification, "pre-cut" means that the raw material 4 is cut in a factory or the like before being transported to the construction site.

The roof material set 3 is installed so that the corner ridge angle θ, the working width B of the normal roof material 30, and the working length L of the normal roof material 30 satisfy the following formula 1.

Satisfying formula 1 means that, as shown in Figure 5, an imaginary straight line a passing through the underwater end point P1 of the edge of the exposed portion 33 of the normal roofing material 30 on the first corner ridge 111 side and the central point P2 of the abovewater end point of the exposed portion 33 is parallel to the corner ridge 11. Point P2 is also the underwater end point of the boundary between two normal roofing materials 30 lined up horizontally in the upper row of the normal roofing material 30.

By satisfying formula 1, as shown in FIG. 2, when multiple roofing materials 30, 31 are staggered on the base surface 20, the shape and size of each precut material 34 can be made the same. Therefore, only one type of precut material 34 needs to be manufactured as the corner roofing material 31 along the first corner ridge 111, and the precut material 34 can be manufactured efficiently. In addition, when there is only one type of precut material 34, it is easier to store the precut material 34 in stock. In addition, when multiple types of precut materials with different shapes are installed in multiple stages, it is necessary to select the appropriate type of precut material 34 for each stage. However, when there is only one type of precut material 34, the effort of selecting the precut material 34 to be installed for each stage can be eliminated, making installation easier.

The imaginary straight line a is not required to be strictly parallel to the ridge 11, but only needs to be parallel to the extent that it can be considered to be parallel in the relevant field. In other words, tan θ and 2L/B do not have to be perfectly equal. In addition, the precut material 34 of this embodiment is laid on the roof underlay 2 so that the working width B of the precut material 34 and the working width B of the normal roof material 30 are the same, but the working width B of the precut material 34 may be different from the working width B of the normal roof material 30.

The multiple cut materials 35 are laid along the second corner ridge 112 on each base surface 20. The cut materials 35 in this embodiment are produced by cutting the raw material 4 at the construction site so that they follow the second corner ridge 112. For this reason, excessive precision is not required for the shape and size of each of the base surface 20 and the roof materials 30, 31, and the installation positions of the roof materials 30, 31 on the base surface 20.

The cut material 35 may be produced by rough cutting the raw material 4. Here, "rough cutting" means that the raw material 4 is cut before it is transported to the construction site so that the edge on the corner ridge 11 side (the second corner ridge 112 side) generally follows the corner ridge 11 (the second corner ridge 112 side).

In addition, if the length of the eaves (the length of the underwater edge of the base surface 20) is a specified length, the cut material 35 may be produced by pre-cutting the raw material 4. In particular, if the following formula 2 is satisfied, roofing materials with the same working width B can be used as the pre-cut material 34 and the cut material 35. Note that n in formula 2 is a positive even number.

For example, the multiple roofing materials 30, 31 are installed as shown below. First, as shown in FIG. 3, the multiple roofing materials 30, 31 in the first row located on the most downstream side of the base surface 20 are laid in order from the first corner ridge 111 side to the second corner ridge 112 side. That is, first, the pre-cut material 34 along the first corner ridge 111 is laid, then the multiple normal roofing materials 30 are laid, and finally the cut material 35 along the second corner ridge 112 is laid. In this case, the ends of the roofing materials 30, 31 located on the second corner ridge 112 side on the first corner ridge 111 side of the roofing materials 30, 31 located on the first corner ridge 111 side are overlapped on the ends of the roofing materials 30, 31 located on the first corner ridge 111 side on the second corner ridge 112 side. In addition, each roofing material 30, 31 is fixed to two vertically adjacent crosspieces 23 using fasteners 12 or the like as described above. The cut material 35 is made by cutting the raw material 4 at the construction site so that it fits along the second corner ridge 112, and is then applied to the roof foundation 2.

Next, as shown in FIG. 4, the second tier of roofing materials 30, 31 are laid in sequence on the above-water side of the first tier of roofing materials 30, 31, from the first corner ridge 111 side toward the second corner ridge 112 side. In this case, the second tier of roofing materials 30, 31 are constructed in the same way as the first tier of roofing materials 30, 31. However, each of the second tier of roofing materials 30, 31 is laid so that its below-water end overlaps the above-water end of the roofing material 30, 31 of the tier below, and is shifted horizontally by half the working width B relative to the roofing material 30, 31 of the tier below.

Then, from the third tier to the top tier, the multiple roofing materials 30, 31 are installed one tier at a time in the same way as the multiple roofing materials 30, 31 in the second tier. In this way, the multiple roofing materials 30, 31 are installed over the entire base surface 20.

The construction of the multiple roof materials 30, 31 described above is carried out after determining three items: the roof slope, the working width B of the normal roof material 30, and the working length L of the normal roof material 30 (see Figure 5). When constructing the multiple roof materials 30, 31, if any two of the three items have been determined, the remaining one is calculated and determined based on these two items and a relational equation.

For example, when the shape and size of the normal roofing material 30 to be applied to the roof underlayment 2 is determined, the working length L of the normal roofing material 30 is determined from the roof slope and the working width B of the normal roofing material 30. In this case, the working length L of the normal roofing material 30 is calculated using the following formulas 3 to 5. Note that the roof slope in formula 3 is a dimensional slope.

Table 1 shows the calculation results when the roof slope is 2.5 sun slope and the working width B of the normal roof material 30 is 485 mm.

In addition, if the shape and size of the normal roofing material 30 to be applied to the roof underlayment 2 have not been determined, the working width B of the normal roofing material 30 is determined from the roof slope and the working length L of the normal roofing material 30. In this case, the working width B of the normal roofing material 30 is calculated using the above formula 3 and the following formulas 6 and 7.

Table 2 shows the calculation results when the roof slope is 2.5 sun slope and the working length L of the normal roof material 30 is 300 mm.

If the roof slope has not been determined, the roof slope is determined from the working width B of the normal roof material 30 and the working length L of the normal roof material 30.

In this case, the roof slope is calculated using the above formula 4 and the following formulas 8 and 9.

(2) Aspects
As is clear from the embodiment described above, the roofing material (normal roofing material) 30 of the first aspect is a roofing material 30 that is staggered on the base surface 20 adjacent to the ridge 11, and has the following configuration. The angle θ of the ridge 11 with respect to the horizontal direction, the working width B of the roofing material 30, and the working length L of the roofing material 30 satisfy the following formula 1.

According to this embodiment, when multiple roofing materials 30, 31 are staggered on the base surface 20, the corner roofing materials 31 (pre-cut materials 34) installed along the corner ridge 11 can be made the same shape and size. Therefore, only one type of corner roofing material 31 needs to be manufactured, making it possible to manufacture the corner roofing materials 31 efficiently. In addition, it becomes easier to store the corner roofing materials 31 in stock. Furthermore, if there is only one type of corner roofing material 31, when installing the corner roofing materials 31 in multiple stages, there is no need to select corner roofing materials 31 with an appropriate shape and size for each stage, making installation easier.

The second aspect of the roofing material 30 can be realized by combining it with the first aspect. In the second aspect, the angle θ is 45° or more.

In this case, it is possible to prevent the corner ridge 11 from becoming a valley.

The roofing material set 3 of the third embodiment has the following configuration. The roofing material set 3 comprises a plurality of roofing materials 30, 31 that are staggered on the base surface 20 adjacent to the corner ridge 11. The plurality of roofing materials 30, 31 include a plurality of normal roofing materials 30 that do not follow the corner ridge 11, and a plurality of corner roofing materials 31 that follow the corner ridge 11. Each of the plurality of normal roofing materials 30 is a roofing material 30 of the first or second embodiment. For each of the plurality of corner roofing materials 31, the angle α of the edge on the corner ridge 11 side with respect to the horizontal direction is the same as the angle θ. The plurality of corner roofing materials 31 are the same in shape and size.

According to this embodiment, multiple corner roofing materials 31 of the same shape and size can be used to stagger multiple roofing materials 30, 31.

The construction structure of the roofing material set 3 of the fourth embodiment is the construction structure of the roofing material set 3 of the third embodiment, and has the configuration shown below. A number of normal roofing materials 30 and a number of corner roofing materials 31 are constructed in sequence from the belowwater side to the abovewater side.

According to this embodiment, a roof structure 1 can be provided in which multiple regular roofing materials 30 and multiple corner roofing materials 31 are installed in sequence from the belowwater side to the abovewater side.

The construction method for the roofing material set 3 of the fifth aspect is the construction method for the roofing material set 3 of the third aspect, and has the following configuration.

The roof slope, working width B, and working length L are selected from any two of them, and the remaining one is determined based on a relational equation, and multiple roof materials 30, 31 are installed.

According to this aspect, when any two of the roof slope, working width B, and working length L are determined, the remaining one can be determined based on a relational equation, so that when multiple roofing materials 30, 31 are staggered on the base surface 20, the shape and size of the corner roofing materials 31 installed along the corner ridge 11 can be made the same.

B Working width L Working length θ Corner ridge angle 1 Roof structure (installation structure)
11 Corner ridge 20 Base surface 3 Roof material set 30 Normal roof material 31 Corner ridge roof material

Claims (2)

A method for installing a roofing material set, comprising:
The roofing material set includes:
The roof is made of multiple materials that are staggered on the base surface adjacent to the corner of the building.
The plurality of roofing materials include
A plurality of normal roof materials that do not follow the corner ridge;
a plurality of corner roofing members along the corner;
Each of the plurality of normal roofing materials is
A roofing material that is staggered on the base surface adjacent to the corner ridge,
The angle θ of the corner ridge with respect to the horizontal direction, the working width B of the roof material, and the working length L of the roof material satisfy the following formula 1,
Each of the plurality of corner roof materials has an angle of the edge of the corner side with respect to the horizontal direction that is the same as the angle θ,
The plurality of corner roof materials include a plurality of precut materials having the same shape and size and laid along the first corner of the base surface, and a plurality of cut materials cut at the construction site to fit along the second corner of the base surface,
The roof slope, the working width B, and the working length L are selected from any two of the three based on a relational expression, and the remaining one is selected, and the plurality of roof materials are installed.
How to install a roofing material set. The plurality of cut materials are rough cut from the original material.
A method for installing the roofing material set according to claim 1.

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