JP4435045B2 - Fireproof outer wall structure in the wooden frame wall construction method - Google Patents

Description

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

  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.

  Synthetic resin-based siding materials such as vinyl chloride resin are relatively lightweight, have excellent colorability, and are less susceptible to rust and corrosion, but have a major problem of poor fire resistance compared to ceramic siding materials and metal-based siding materials It is. For this reason, it is stipulated in the Building Standards Act that when a construction is to be performed in a densely populated area of a house, the construction must be performed by providing a fireproof layer on the indoor side of the synthetic resin siding material.

In the following Patent Document 1, a heat insulating material layer is filled inside a wooden frame, a gypsum board layer is pasted on the indoor side of the wooden frame, and an inorganic material such as a volcanic glassy multilayer board on the outdoor side. An outer wall structure in a wooden frame wall construction method has been proposed in which a reinforced plate-like body layer is attached and a moisture-permeable waterproof layer and a synthetic resin siding material are provided on the outdoor side of the inorganic reinforced plate-like body layer.
JP 2005-90165 A

However, the configuration described in Patent Document 1 does not necessarily have sufficient fire resistance, and there is a demand for improvement in fire resistance in an outer wall structure using a synthetic resin siding material.
An object of this invention is to provide the outer wall structure which is excellent in fire resistance using the synthetic resin siding material.

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 refractory for outer wall structure in wood wood frame construction, a framework formed by joining the timber, and the inner gypsum board layer disposed indoors side of the frame assembly, the An airtight layer provided between the frame and the inner gypsum board layer, and a synthetic resin siding material layer provided on the outdoor side of the frame via an intermediate material layer, the intermediate material The layer comprises a structural face material layer , an outer gypsum board layer , and a waterproof layer provided on the outdoor side face of the outer gypsum board layer in order from the indoor side , and the synthetic resin siding material characterized that you have the furring strip is provided between the the layer intermediate material layer.

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 excellent in fire resistance provided with the synthetic resin siding material 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.
In the outer wall structure 1 of the present embodiment, an airtight layer 11 and an inner gypsum board layer 12 are provided in this order from the frame side on the indoor side of the frame composed of the vertical frame 2 and the lower frame 3. On the outdoor side, the structural face material layer 21, the first waterproof layer 22, the first trunk edge 23, the outer gypsum board layer 24, the second waterproof layer 25, the second trunk edge 26, and the third waterproof. A layer 27 and a synthetic resin siding material layer 28 are provided in this order from the frame side. The heat insulating material layer 4 is provided inside the frame. In the figure, reference numeral 31 denotes a foundation, 32 denotes a base, and 33 denotes 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.

<Framework>
The frame is formed by joining a vertical frame 2 and a lower frame 3 made of wood. As the wood, structural lumber or laminated lumber of conifers that conform to Japanese agricultural and forestry standards is used.
In the wooden frame wall construction method, as the vertical frame 2 and the lower frame 3, a frame material having a cross-sectional shape of 38 mm × 89 mm or more is used. Preferably, wood with a nominal cross-sectional dimension of 2 inches x 4 inches (actual dimensions are 1.5 inches x 3.5 inches) and 2 inches x 6 inches (actual dimensions are 1.5 inches x 5.5 inches) Is used. A nail is used for joining the vertical frame 2 and the lower frame 3.
The interval between adjacent vertical frames 2 is 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 frame with a 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 frame. This improves the strength of the frame.
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 in any of the above materials.

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 100 mm or less at the peripheral portion and 200 mm or less at the intermediate portion.
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.

<Joint treatment material>
In the inner gypsum board layer 12, a joint treatment material 13 may be applied to a joint portion of adjacent gypsum boards as necessary. As a material for the joint treatment material 13, a joint treatment material for a gypsum board in JIS A 6111 standard can be suitably used. The coating amount is preferably 100 g / m ² or more.

<Airtight layer>
An airtight layer 11 is provided between the frame and the inner gypsum board layer 12 . As the material of the airtight layer 11, a moisture-proof and airtight film is preferably used. Specific examples include a residential plastic moisture-proof film (polyethylene resin) in JIS A 6930 standard, a packaging polyethylene film in JIS Z 1702 standard, and an agricultural polyethylene film in JIS K 6781 standard. The thickness of the moisture-proof and air-tight film is preferably 0.2 mm or less in any of the above materials.
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 frame. 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, standard of JIS A 5905 The fiber board etc. are mentioned.
The thickness of the structural plywood, structural panel, and fiberboard 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 100 mm or less at the peripheral portion and 200 mm or less at the intermediate portion.

<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 100 mm or less at the peripheral portion and 200 mm or less at the intermediate portion.

<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.

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 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 at the center 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 φ3.7 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 first trunk edge 23 and the second trunk edge 26 can be configured using a base lumber or a base laminated material that conforms to Japanese Agricultural Standards. 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 25 is provided on the outdoor side surface of the outer gypsum board layer 24. A third waterproof layer 27 is provided on the indoor side surface of the synthetic resin siding material layer 28.
These first to third waterproof layers 22, 25, and 27 are preferably made of a material that has 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 according to JIS A 6005 standard or moisture-permeable waterproof sheet according to JIS A 6111 standard is suitable as the first to third waterproof layers 22, 25, 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.

The first and third waterproof layers 22 and 27 are not essential, but by providing a part or all of the first to third waterproof layers 22 , 25 , and 27 , a synthetic resin siding can be used in the case of a typhoon or the like where the weather is severe An effect of blocking rainwater that has permeated through the gaps in the material layer 28 is obtained.
Moreover, when the 1st-3rd waterproof layers 22, 25, and 27 have moisture permeability, the moisture in the air on the indoor side 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 to third waterproof layers 22, 25, 27, and on the day when the water becomes sunny and warm. The synthetic resin siding material layer 28 is discharged out of the outer wall structure 1 due to gaps and air permeability.

The total thickness (wall thickness) of the outer wall structure 1 is preferably 138 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 according to the following procedure. First, a vertical frame 2 was vertically joined onto the lower frame 3 by a wooden frame wall construction method to produce a frame. As the vertical frame, a square member having a cross-sectional shape of 38 mm × 89 mm made of SPF material was used. The interval between the adjacent vertical frames 2 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 on the outdoor side of the frame. 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 100 mm at the peripheral part and 200 mm at the intermediate part.
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 12.5 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 100 mm at the peripheral part and 200 mm at the intermediate part.
Next, a second waterproof layer 25 was provided on the outer gypsum board layer 24. As the second waterproof layer 25, asphalt felt in JIS A 6005 standard was used and temporarily fixed with industrial staples (JIS A 5556).

Next, a hard vinyl chloride resin siding material was attached as the synthetic resin siding material layer 28 on the second waterproof layer 25. The composition of the hard vinyl chloride resin is 83% by mass of vinyl chloride resin, 11% by mass of filler (calcium carbonate, etc.), and 6% by mass of other components (stabilizer, reinforcing material, etc.). The shape is a shape including a siding material body 40, an upper edge portion 42, a folding portion 43, a hook portion 44, and an uneven pattern portion 45 as shown in FIGS. The dimensions are as follows: resin plate thickness 1.0 mm, lateral (horizontal) length 1500 mm, working width (interval at the lower end of the hook 44 in the installed state) 203 mm, vertical and horizontal direction in the installed state The height (thickness) in the direction perpendicular to both was 16 mm. The mass per unit area is 2.1 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 was attached sequentially upward from the lowest level.
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 was used, and the fastening interval was 500 mm.

On the other hand, a polyethylene resin film (thickness 0.2 mm) in accordance with JIS A 6930 standard was temporarily fastened as an airtight layer 11 on the indoor side of the framework using industrial staples (JIS A 5556).

Next, a gypsum board (thickness 12.5 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 100 mm at the peripheral portion and 200 mm at the middle portion.
Thus, the outer wall structure 1 having a wall thickness of 138 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 siding material 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 2: vertical frame 3: lower frame 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 25: Second waterproof layer 26: Second trunk edge 27: Third waterproof layer 28: Synthetic resin siding material layer

Claims (2)

A fireproof outer wall structure in a wooden frame wall construction method,
A framework made by joining wood,
An inner gypsum board layer provided on the indoor side of the frame;
An airtight layer provided between the frame and the inner gypsum board layer;
It has a outdoor synthetic resin siding material provided through the intermediate material layer on the side layer of said framework,
The intermediate material layer includes, in order from the indoor side, a structural face material layer , an outer gypsum board layer , and a waterproof layer provided on the outdoor side surface of the outer gypsum board layer , and the synthetic resin It characterized that you have provided furring strip between the the system siding material layer intermediate material layer, a refractory for outer wall structure in wood wood frame construction. 2. The outer wall structure for fireproofing in a wooden framed wall construction method according to claim 1, further comprising a trunk edge provided between said outer gypsum board layer and said structural face material layer.

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