JP4435047B2 - Fireproof outer wall structure in the wooden frame construction method - Google Patents

Description

  The present invention relates to an outer wall structure in a wooden frame construction method.

  In recent years, metal siding materials such as painted aluminum plates and steel plates, ceramic siding materials such as tiles, ceramic plates, bricks and cement plates, vinyl chloride resin, Outer wall siding materials such as synthetic resin siding materials such as polyolefin resins are used.

For example, Patent Document 1 below relates to a wall frame structure in a wooden frame construction method, and includes an inner plate-like body on the indoor side of a structural shaft material composed of horizontal members such as foundations and trunk differences, corner columns, and pipe columns. In addition, a configuration has been proposed in which an outside plate-like body is provided on the outdoor side, and an outer wall material made of cement calcium plate, slag gypsum plate, wood wool cement plate, or the like is provided as the outermost layer.
Japanese Patent Laid-Open No. 10-292527

  Although ceramic-based siding materials are excellent in fire resistance, they have the disadvantage of poor workability due to their large weight. In cold regions, rainwater that has entered the interior freezes and expands due to a decrease in the outside air temperature, which may cause the siding material to rupture, which causes a problem in freezing.

  Metal-based siding materials have excellent fire resistance and are relatively light and are not easily cracked due to freezing. However, dents are easily generated by impact, and rust and corrosion are caused by salt damage (sea breeze), acid rain, volcanic ash, etc. There is a problem that it is easy.

  In contrast, synthetic resin-based siding materials are relatively lightweight, have excellent colorability, are resistant to rust and corrosion, and have good impact resistance and freezing properties. The big problem is that the fire resistance is inferior.

  An object of the present invention is to provide an outer wall structure in a wooden frame construction method, which uses a synthetic resin siding material and has excellent fire resistance.

In order to achieve the above object, the present invention employs the following configuration.
That is, the outer wall structure of the present invention is a fireproof outer wall structure in a wooden shaft construction method, and is composed of a shaft member formed by assembling a horizontal member and a column member in a rectangular frame shape, and an indoor side of the shaft member. Inner gypsum board layer provided, an airtight layer provided between the shaft and the inner gypsum board layer, and a synthetic resin system provided on the outdoor side of the shaft through an intermediate material layer A siding material layer, and the intermediate material layer includes, in order from the indoor side, a structural face material layer and an outer gypsum board layer, and the synthetic resin-based siding material layer and the intermediate material layer, Between the first waterproof layer provided on the outdoor surface of the structural face material layer and / or the indoor surface of the synthetic resin siding material layer. a second waterproof layer have characterized Rukoto was.

Furthermore, it is preferable that a trunk edge is provided between the outer gypsum board layer and the structural face material layer.

  ADVANTAGE OF THE INVENTION According to this invention, the outer wall structure in a wooden frame construction method provided with the synthetic resin siding material and excellent in fire resistance is obtained.

1 to 3 show an embodiment of an outer wall structure of the present invention, and FIG. 1 is a partially cutaway perspective view illustrating the outer wall structure in a constructed state. 2 is a horizontal sectional view of the outer wall structure, and FIG. 3 is a vertical sectional view.
The outer wall structure 1 according to the present embodiment includes an airtight layer 11 and an inner cover on the indoor side of a shaft member formed by assembling a pillar 2a and a pillar 2b as pillar members and a base 3 as a horizontal member into a rectangular frame shape. A plaster board layer 12 is provided in order from the shaft member side. On the outdoor side of the shaft member, a structural face material layer 21, a first waterproof layer 22, a first trunk edge 23, an outer gypsum board layer are provided. 24, the second trunk edge 26, the second waterproof layer 27, and the synthetic resin siding material layer 28 are provided in this order from the shaft side. Further, a heat insulating material layer 4 is provided inside the shaft material. In the figure, reference numeral 31 indicates a foundation, and 32 indicates a flooring.
In this embodiment, the structural face material layer 21, the first waterproof layer 22, the first trunk edge 23, and the outer gypsum board layer 24 correspond to the intermediate material layer.

<Shaft material>
The shaft member is formed by attaching a column 2a and an inter-column 2b on a base 3 as a horizontal member. Moreover, although not shown in figure, horizontal members other than the base 3 are provided suitably. As materials for the base 3, the pillars 2a, and the inter-columns 2b, coniferous structural lumber or laminated lumber conforming to the Japanese Agricultural Standard is used.
In the present embodiment, square members having a cross-sectional shape of 90 mm × 90 mm or more are preferable as the base 3 and the pillars 2 a, and square members having a cross-sectional shape of 45 mm × 90 mm or more are preferably used as the inter-columns 2 b. It is preferable that the dimensions of the columns 2a and the inter-columns 2b in the wall thickness direction are equal.
The distance between adjacent pillars 2a and 2b and the distance between adjacent pillars 2b are preferably 500 mm or less.

<Insulation layer>
In the present embodiment, the heat insulating material 4 is formed by filling the inside surrounded by the shaft material with the heat insulating material. By providing the heat insulating material layer 4, the heat insulating effect in the outer wall structure 1 can be improved.
Examples of the heat insulating material include, for example, inorganic materials, rock wool and glass wool according to JIS A 9521 standard, and organic materials include polystyrene foam plates, polyethylene foam plates, phenol foam plates, rigid urethanes by a bead method or an extrusion method. A foam board etc. are mentioned. The thickness of the heat insulating material is preferably 42 to 200 mm.

<Inner gypsum board layer>
An inner gypsum board layer 12 is provided on the indoor side of the shaft member. Thereby, the strength of the shaft is improved.
As the inner gypsum board layer 12, a gypsum board, a reinforced gypsum board, a sizing gypsum board, a decorative gypsum board and the like in JIS A 6901 standard are preferably used. The thickness of the inner gypsum board layer 12 is preferably 9.5 mm or more for a gypsum board, a sizing gypsum board, or a decorative gypsum board, and preferably 12.5 mm or more for a reinforced gypsum board.

As the inner gypsum board fastening material 12a, a gypsum board nail or a tapping screw is used. The gypsum board nail is preferably a gypsum board nail in the JIS A 5508 standard, and preferable types include GNF38 to GNF65, GNSF38 to GNSF65, GNC38 to GNC65, and GNSC38 to GNSC65. The fastening interval is preferably 200 mm or less.
The tapping screw is preferably φ3.5 mm × length 15 mm to φ3.8 mm × length 60 mm. The fastening interval is preferably 200 mm or less.

<Airtight layer>
Airtight layer 11 is provided between the shaft member and the inner gypsum board layer 12. A moisture-proof and airtight sheet is preferably used as the material of the airtight layer 11. As a specific example, a moisture-proof and air-tight sheet (polyethylene resin) in JIS A 6930 standard can be mentioned. The thickness of the sheet is preferably 0.02 to 0.2 mm.
By providing the airtight layer 11 , moisture from the indoor side can be prevented, and the airtightness is improved.

<Structural face material layer>
A structural face material layer 21 is provided on the outdoor side of the shaft member. The structural face material layer 21 is made of a plate-like material made of wood or plant fiber, and examples thereof include a material obtained by forming finely crushed wood into a plate shape using a synthetic resin or an adhesive. Specific examples include structural plywood in the standard of the Ministry of Agriculture, Forestry and Fisheries Notification No. 1371 in 1969, structural panel in the standard of Ministry of Agriculture, Forestry and Fisheries Notification No. 360 in 1987, particle board in the standard of JIS A 5908, and the like.
The thickness of the structural plywood and structural panel is preferably 9 mm or more, and in the case of particle board, the thickness is preferably 10 mm or more.

  A nail is used as the fastening material 21a for the structural face material. Specifically, an iron round nail in JIS A 5508 standard is preferably used, and preferred examples include N50 to N150. The fastening interval is preferably 200 mm or less.

<Outside gypsum board layer>
An outer gypsum board layer 24 is provided on the outdoor side of the structural face material layer 21. As the material of the outer gypsum board layer 24, the same various gypsum boards as mentioned above as the material of the inner gypsum board layer 12 can be used.
In the outer wall structure of the present invention, the inner gypsum board layer 12 and the outer gypsum board layer 24 may have the same configuration or may be different from each other.

  A nail is used as the outer gypsum board fastening material 24a. Specifically, an iron round nail in JIS A 5508 standard is preferably used, and preferred examples include N50 to N150. The fastening interval is preferably 200 mm or less.

<Synthetic resin siding material layer>
A synthetic resin siding material layer 28 is provided on the outdoor side of the outer gypsum board layer 24.
As the synthetic resin siding material layer 28, a thermoplastic resin siding material is preferably used. Examples of the thermoplastic resin include vinyl chloride resin, polyolefin such as polyethylene and polypropylene, polymethyl methacrylate, styrene copolymer, acrylate-styrene-acrylonitrile copolymer (ASA resin), chlorinated polyethylene, acrylonitrile-ethylene, A propylene rubber-styrene copolymer (AES resin), fiber reinforced plastic (FRP), etc. can be mentioned.
Additives such as a filler, a reinforcing material, a pigment, a processing aid, a heat stabilizer, and an ultraviolet absorber are added to the synthetic resin plate constituting the siding material as necessary.

Among these, a vinyl chloride resin siding material, a polyolefin resin siding material, and the like are preferable because they are moisture permeable and are less likely to cause freeze fracture. In particular, a siding material made of vinyl chloride resin is more preferable because it is resistant to salt damage, acidity, and alkalinity.
The vinyl chloride resin is a synthetic resin having a high degree of freedom in coloring the resin and a shape design at the time of molding, less deterioration in physical properties over a long period of time, and flame retardancy. Therefore, the siding material made of vinyl chloride resin is a decorative material that maintains the excellence of a building such as a house for a long period of time, and protects the heat insulating material and other building members located on the indoor side from the siding material. It can maintain flammability.
As such a siding material made of vinyl chloride resin, specifically, trade names “Poly Panel SP”, “Poly Panel DX”, “Poly Panel S”, etc. of Shin-Etsu Polymer Co., Ltd. are commercially available.
A siding material made of a hard vinyl chloride resin plate according to JIS K 6784 standard is also suitable.

The structure of the siding material constituting the synthetic resin-based siding material layer 28 is not particularly limited, but in general, it is composed of a single-layer synthetic resin plate, a laminate of a plurality of synthetic resin plates, a single layer or Examples include composites in which suitable foams are bonded to the back side of a plurality of synthetic resin plates.
When laminating a plurality of synthetic resin plates, the same resin material is preferable from the viewpoint of separation and recycling. For example, a co-extruded two-layer structure using vinyl chloride resin, the base layer part is composed of a low-cost resin compound material mainly composed of recycled materials, and the surface layer part is a virgin resin compound material with excellent weather resistance It is economical to configure using
Moreover, you may provide a surface decoration layer as needed. As a material for the surface decorative layer, for example, a fluorine resin, an acrylic resin, or the like is preferably used. Printing on the surface of the surface decorative layer, such as wood grain, metal tone, and stone tone, may be performed as necessary. The thickness of the surface decorative layer is preferably about 0.05 to 0.5 mm, more preferably about 0.2 mm ± 0.05 mm.

  In particular, by providing a material layer with good weather resistance on the surface layer and laminating a low-cost material on the lower layer, it is possible to ensure economy while improving durability. In the case of composites that combine a single layer or multiple synthetic resin plates with appropriate foam, make up for the lack of rigidity of thin synthetic resin siding, reinforce heat insulation performance, and improve handling and workability. Can do. Examples of the foam include foamed polyurethane, foamed polystyrene, and isocyanurate foam. In this case, the foam has a thickness of about 1 to 10 mm.

The size of the siding material is not particularly limited. Usually, in the case of an extrusion-molded product, the vertical dimension (working width) in the vertical direction (vertical direction, width direction of the siding material) in the applied state is 100. The lateral dimension in the lateral direction (horizontal direction, siding material length direction) is preferably 1000 to 5000 mm. In the case of an injection molded product, the longitudinal dimension is preferably about 500 to 1000 mm and the lateral dimension is about 500 to 2000 mm.
In particular, the normal construction of siding materials is performed from the bottom to the top of the building (or vice versa), or in the lateral direction, so that each dimension is in the range of 100 to 5000 mm. Convenient in construction. More preferably, the vertical dimension is 200 to 250 mm and the horizontal dimension is 4000 mm or less.
The thickness of the siding material (resin plate) itself is not particularly limited, but is preferably about 0.5 to 10 mm.
An uneven pattern portion can be formed on the surface of the siding material using an embossing roll or the like.

In this embodiment, the siding material constituting the synthetic resin-based siding material layer 28 is a molded body made of a single long plastic sheet, and the shape of the siding material body 40 and the mounting hole 41 are provided continuously. The plate-shaped upper edge 42, the ridged portion 43 of the ridge extending in the horizontal direction between the siding material body 40 and the upper edge 42, and the lower edge of the siding material body 40 are formed. And a hook-shaped hook portion 44. A concavo-convex pattern portion 45 is provided along the horizontal direction in the central portion of the siding material body 40 in the vertical direction (vertical direction). The thickness (the height in the direction perpendicular to both the vertical direction and the horizontal direction in the applied state) in the uneven pattern portion 45 is preferably 10 to 30 mm.
Such a siding material is fixed in a suspended form by screwing or nailing using the mounting hole 41, and the siding materials adjacent in the vertical direction (vertical direction) are related to each other by the folding portion 43 and the hook portion 44. Combined, they are not easily separated from each other.

The surface density (mass per unit area) of the siding material is usually about 0.5 to 15 kg / m ² , preferably 0.5 to 10 kg / m ² , and more preferably 1.5 to 2. 9 kg / m ² . When the surface density is excessively small, the strength as the exterior material is weak, and when the surface density is excessively large, the siding material becomes too heavy, and a reinforcing structure for holding the siding material may be required. Rigidity increases, and workability particularly in narrow places is reduced.

As the fastening material 28a for the synthetic resin siding material, a nail or a tapping screw is used.
As the nail, a nail in the JIS A 5508 standard is preferable, and a nail of φ2.75 mm × length 40 mm to φ3.75 mm × length 90 mm is preferable. The fastening interval is preferably 500 mm or less.
The tapping screw is preferably φ3.5 mm × length 15 mm to φ3.8 mm × length 60 mm. The fastening interval is preferably 500 mm or less.

<Trunk>
In the present embodiment, a first trunk edge 23 is provided between the structural face material layer 21 and the outer gypsum board layer 24. Although the first trunk edge 23 is not essential, by providing this, moisture from the indoor side can be prevented and condensation can be prevented.
A second trunk edge 26 is provided between the synthetic resin siding material layer 28 and the outer gypsum board layer 24. By providing the second trunk edge 26 , rainwater that has entered from the gaps of the siding material is discharged downward, or drying between the synthetic resin siding material layer 28 and the outer gypsum board layer 24 is promoted by ventilation. An effect is obtained.
The 1st trunk edge 23 and the 2nd trunk edge 26 can be comprised using the sawmill for manufacturing a conifer which meets Japanese agricultural and forestry standards, or a laminated lumber. The cross-sectional dimensions of the first body edge 23 and the second body edge 26 are preferably 13 mm × 30 mm or more.

A tapping screw or a nail is used as the fastening material 23a, 26a for the trunk edge.
The tapping screw is preferably φ3.5 mm × length 50 mm to φ6.3 mm × length 150 mm. The fastening interval is preferably 500 mm or less.
As the nail, an iron round nail in JIS A 5508 standard is preferably used, and preferred types include N50 to N150. The fastening interval is preferably 500 mm or less.
It can also be set as the structure which does not use the fastening materials 23a and 26a for trunk edges.

<Waterproof layer>
In the present embodiment, the first waterproof layer 22 is provided on the outdoor side surface of the structural face material layer 21, and the second waterproof layer 27 is provided on the indoor side surface of the synthetic resin siding material layer 28. It has been.
These first and second waterproof layers 22 and 27 are preferably made of a material having waterproof properties and moisture permeability. Specific examples include an asphalt-impregnated waterproof sheet and a moisture-permeable waterproof sheet (moisture-permeable film).
Specifically, asphalt felt in JIS A 6005 standard or moisture-permeable waterproof sheet (polyolefin resin) in JIS A 6111 standard is suitable as the first and second waterproof layers 22 and 27.
The nominal unit area mass of asphalt felt is preferably 700 g / m ² or less, more preferably 430 g / m ² or 650 g / m ² .
Specific examples of the material of the moisture permeable waterproof sheet include polyolefin, polyethylene, polyester, and polypropylene. The thickness of the moisture permeable waterproof sheet is preferably 0.16 mm or less.

In the present invention, the first waterproof layer and / or the second waterproof layer is provided. By providing either one or both of the first and second waterproof layers 22 and 27 , an effect of blocking rainwater that has permeated through the gaps in the synthetic resin siding material layer 28 in the case of a typhoon or the like with severe wind and rain is obtained. It is done.
Further, since the first and second waterproof layers 22 and 27 have moisture permeability, moisture in the indoor air can be transmitted to the outdoor side. When moisture that has permeated to the outside of the room is condensed, it becomes water droplets. The water droplets are prevented from entering the indoor side by the first and second waterproof layers 22 and 27, and are synthesized on the day when the water becomes clear and warm. The resin-based siding material layer 28 is discharged out of the outer wall structure 1 due to a gap or air permeability.

The overall thickness (wall thickness) of the outer wall structure 1 is preferably 150 mm or more.
According to the present embodiment, the outer wall structure 1 having the excellent fire resistance, which is provided with the synthetic resin siding material layer 28 and is substantially equivalent to the ceramic siding material or the metal siding material, is obtained.
Moreover, the outer wall structure 1 of the present embodiment is lightweight and excellent in workability, as well as excellent in impact resistance, freezing property, and contamination property, as well as in waterproof and wind pressure resistance, as shown in test examples described later. is there.

In the present embodiment, the structural face material layer 21 and the outer gypsum board layer 24 forming the intermediate material layer are arranged such that the outer gypsum board layer 24 is on the outdoor side of the structural face material layer 21. However, conversely, the structural face material layer 21 can be disposed on the outdoor side. However, from the viewpoint of improving earthquake resistance and durability, it is preferable to provide the outer gypsum board layer 24 on the outdoor side as in this embodiment.
In the present invention, the structural face material layer and the outer gypsum board layer are provided in order from the indoor side.

  The present invention will be described more specifically with reference to the following examples and comparative examples, but the present invention is not limited to these examples.

<Example 1>
The outer wall structure was manufactured by the following procedure. First, a shaft member was manufactured by vertically joining the pillars 2a and the inter-columns 2b on the base 3 by a wooden shaft construction method. The pillar 2a was a square member having a cross-sectional shape of 105 mm × 105 mm made of Spools laminated material, and the intermediate pillar 2b was a square member having a cross-sectional shape of 45 mm × 105 mm consisting of “too much”. The interval between the pillars 2a and the intermediate pillars 2b was 500 mm. The heat insulating material layer 4 was not provided. Next, a structural plywood having a thickness of 9 mm was attached as the structural face material layer 21. As the fastening material 21a for the structural face material, an iron round nail N50 in JIS A 5508 standard was used. The fastening interval was 200 mm.
Next, the first waterproof layer 22 was provided on the structural face material layer 21. As the first waterproof layer 22, asphalt felt in JIS A 6005 standard was used, and temporarily fixed with industrial staples (JIS A 5556).

Subsequently, a gypsum board (thickness 9.5 mm) according to JIS A 6901 standard was attached as the outer gypsum board layer 24 on the first waterproof layer 22. In this embodiment, the body edges 23 and 26 are not provided. As the outer gypsum board fastening material 24a, an iron round nail N50 in JIS A 5508 standard was used. The fastening interval was 200 mm.
Next, a second waterproof layer 27 was provided on the outer gypsum board layer 24. As the second waterproof layer 27, asphalt felt in JIS A 6005 standard was used and temporarily fixed with industrial staples (JIS A 5556).
Next, a siding material made of a hard vinyl chloride resin plate (thickness 1 mm) according to JIS K 6784 standard was attached as the synthetic resin-based siding material layer 28 on the second waterproof layer 27.
The siding material has a siding material body 40 as shown in FIGS. 1 and 3, an upper edge portion 42, a folding portion 43, a hook portion 44, and an uneven pattern portion 45. The dimensions are a horizontal (horizontal) length of 3810 mm, a working width (interval of the lower end of the hook 44 in the installed state) of 203 mm, and a height in a direction perpendicular to both the vertical and horizontal directions in the installed state. (Thickness) 16 mm. The mass per unit area is 2.2 kg / m ² . Further, a surface layer portion made of a hard vinyl chloride resin having a thickness of 0.2 mm is provided.

When attaching the synthetic resin-based siding material layer 28, the starter 28b was attached first, and then the siding material body 40 was attached from the bottom to the top.
As the fastening material 28a for the synthetic resin siding material, a nail having a diameter of 2.75 mm and a length of 40 mm in the JIS A 5508 standard was used, and the fastening interval was 500 mm.

On the other hand, a polyethylene-based resin sheet (thickness 0.2 mm) according to JIS A 6930 standard was temporarily fastened as an airtight layer 11 on the indoor side of the shaft using industrial staples (JIS A 5556).

Next, a gypsum board (thickness: 9.5 mm) according to JIS A 6901 standard was attached as an inner gypsum board layer 12 on the airtight layer 11. As the inner gypsum board fastening material 12a, a gypsum board nail (GNF38) according to JIS A 5508 standard was used, and the fastening interval was 200 mm.
Thus, the outer wall structure 1 having a wall thickness of 150 mm was manufactured.

<Comparative Example 1>
As a comparative example, a metal siding material (manufactured by IG Corporation, product name: Galva Span) was prepared.
<Comparative example 2>
As a comparative example, a ceramic siding material (manufactured by Nichiha, product name: Moen Siding) was prepared.

<Evaluation>
Regarding the outer wall structure obtained in Example 1 and the siding materials of Comparative Examples 1 and 2, the following evaluation methods were used for fire resistance, waterproofness, wind pressure resistance, impact resistance, freezing, contamination, and workability. evaluated. The evaluation results are shown in Table 1. In Example 1, with respect to fire resistance, waterproofness, and wind pressure resistance, the entire outer wall structure including the synthetic resin siding material is evaluated, and with respect to impact resistance, freezing, contamination, and workability. Only the synthetic resin siding material was evaluated.

(1) Fire resistance As a fire resistance measurement method, the Building Standard Act Article 23 and the Building Standard Act Construction Ordinance Article 109-6 No.1 and No.2 (the Ministry of Land, Infrastructure, Transport and Tourism certified fireproof structure certification test) The outer wall (bearing wall): 20 minutes each) In Table 1, the measurement results are shown by the following evaluation criteria.
○: Passed.
X: Fail.

(2) Waterproofness The waterproofness test was performed with a test apparatus having an opening with a width of 2,000 mm and a height of 2,000 mm that satisfies the specifications of the performance test method for building components and structural parts of JIS A1414. Table 1 shows the pressure value (unit: Pa) when water leaks on the back surface as a measurement result.

(3) Wind pressure resistance The wind pressure resistance was measured by a test apparatus having an opening having a width of 2,000 mm and a height of 2,000 mm that satisfies the specifications of the building material of JIS A1414 and the performance test method of the structural part. . Table 1 shows values (units: Pa) until breakdown by positive pressure (pressure applied from the front) and negative pressure (pressure in the reverse direction) as measurement results.

(4) Impact resistance The impact resistance was evaluated by a method in which a ball drop impact test of JIS K6745 was applied, and an iron ball with a mass of 1 kg was dropped from a height of 1 m to evaluate the damage situation. In Table 1, the measurement results are shown by the following evaluation criteria.
○: No change.
Δ: Crack on the back surface.
X: Deformation.

(5) Freezing Freezing test was performed under the following conditions.
Equipment used: Constant temperature and humidity test piece: Several cutouts in the siding width were prepared. Test conditions: [immersion in water (25 ° C., 24 hours) / frozen (−30 ° C., 24 hours)] × by repeating 10 times went. In Table 1, the measurement results are shown by the following evaluation criteria.
○: No change.
X: Crack generation.

(6) Contamination (6-1) Salt damage The outer wall structure obtained in the example and the siding material of the comparative example were immersed in a saline solution having a concentration of 20% by mass for 4 days. In Table 1, the measurement results are shown by the following evaluation criteria.
○: No change.
Δ: Slightly discolored.
X: Discoloration.
(6-2) Acid Rain Resistance The outer wall structure obtained in the example and the siding material of the comparative example were immersed in an aqueous sulfuric acid solution having a concentration of 10% by mass for 4 days. In Table 1, the measurement results are shown by the following evaluation criteria.
○: No change.
Δ: Slightly discolored.
X: Discoloration.
(6-3) Volcanic ash resistance The outer wall structure obtained in the example and the siding material of the comparative example were immersed in an aqueous solution of sodium hydroxide having a concentration of 10% by mass for 4 days. In Table 1, the measurement results are shown by the following evaluation criteria.
○: No change.
Δ: Slightly discolored.
X: Discoloration.

(7) Workability In order to evaluate the workability, the mass per unit area (unit: kg / m ² ) of the outer wall structure obtained in the example and the siding material of the comparative example was measured. The lighter the weight, the better the workability.

  From the results shown in Table 1, the outer wall structure of Example 1 satisfies the predetermined fire resistance standards, and the performances of waterproofness, wind pressure resistance, impact resistance, freezing, contamination, and workability are all good. It was recognized that

It is a partially cutaway perspective view showing an embodiment of the outer wall structure of the present invention. It is a horizontal sectional view of the outer wall structure of FIG. It is a vertical sectional view of the outer wall structure of FIG.

Explanation of symbols

1: outer wall structure 2a: pillar 2b: intermediary pillar 3: foundation 4: heat insulating material layer 11: airtight layer 12: inner gypsum board layer 21: structural face material layer 22: first waterproof layer 23: first trunk Edge 24: Outer gypsum board layer 26: Second trunk edge 27: Second waterproof layer 28: Synthetic resin siding material layer

Claims (2)

A fireproof outer wall structure in a wooden shaft construction method, a shaft member obtained by assembling a horizontal member and a column member into a rectangular frame shape, an inner gypsum board layer provided on the indoor side of the shaft member, An airtight layer provided between the shaft member and the inner gypsum board layer, and a synthetic resin siding material layer provided on the outdoor side of the shaft member via an intermediate material layer,
The intermediate material layer, in order from the indoor side , comprises a structural face material layer and an outer gypsum board layer, and a trunk edge is provided between the synthetic resin siding material layer and the intermediate material layer, that comprise a second waterproof layer provided on the first waterproof layer and / or on the interior side surface of the synthetic resin siding material layer provided on the outdoor side surface of the structural face material layer An outer wall structure for fireproofing in a wooden frame construction method . The outer wall structure for fireproofing in the wooden shaft construction method according to claim 1, further comprising a trunk edge provided between the outer gypsum board layer and the structural face material layer.

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