Wooden load-bearing wall, method of constructing wooden load-bearing wall, method of increasing co-efficient of effective wall length of wooden load-bearing wall, and gypsum-based load-bearing board

A method of constructing a wooden load-bearing wall in which a gypsum-based load-bearing board is fixed to a wooden wall base used in a wooden framework construction method or in a wooden framework wall construction method, the method of constructing a wooden load-bearing wall comprising:

• fastening a gypsum-based load-bearing board, by a fastener, to a wooden wall base, in which the gypsum-based load-bearing board includes a main material or a core material formed from a board-shaped hardened gypsum;
• and a paper covering at least front and back surfaces of the main material or the core material,
• wherein the gypsum-based load-bearing board has a surface density or a surface weight, specified as a mass per unit area of a wall surface, in a range from 6.5 kg/m2 to 8.9 kg/m2;
• a lateral nail resistance of 500 N or more;
• and a compressive strength of 6.5 N/mm2 or more,
• wherein the main material or the core material contains glass fiber and starch,
• wherein an amount of the glass fiber in the gypsum-based load-bearing board is 3.0 to 3.5 parts by weight per 100 parts by weight of calcined gypsum,
• wherein an amount of the starch in the gypsum-based load-bearing board is 5.0 to 8.0 parts by weight per 100 parts by weight of calcined gypsum, and
• wherein the gypsum-based load-bearing board has a correction value (Pu′) of an ultimate strength (Pu) of 7.7 kN or more, the correction value (Pu′) of the ultimate strength (Pu) being measured by an in-plane shear test using a test piece of the wooden load-bearing wall with a wall length of 1.82 m.

A method of increasing a co-efficient of effective wall length of a wooden load-bearing wall constructed by fastening a gypsum-based load-bearing board, by a fastener, to a wooden wall base used in a wooden framework construction method or in a wooden framework wall construction method, the method of increasing the co-efficient of effective wall length comprising:

• constituting a gypsum-based load-bearing board to include:
• a main material or a core material formed from a board-shaped hardened gypsum;
• and a paper covering at least front and back surfaces of the main material or the core material,
• wherein the gypsum-based load-bearing board has a surface density or a surface weight, specified as a mass per unit area of a wall surface, in a range from 6.5 kg/m2 to 8.9 kg/m2;
• a lateral nail resistance of 500 N or more;
• and a compressive strength of 6.5 N/mm2 or more,
• wherein the main material or the core material contains glass fiber and starch,
• wherein an amount of the glass fiber in the gypsum-based load-bearing board is 3.0 to 3.5 parts by weight per 100 parts by weight of calcined gypsum,
• wherein an amount of the starch in the gypsum-based load-bearing board is 5.0 to 8.0 parts by weight per 100 parts by weight of calcined gypsum, and
• wherein the gypsum-based load-bearing board has a correction value (Pu′) of an ultimate strength (Pu) of 7.7 kN or more, the correction value (Pu′) of the ultimate strength (Pu) being measured by an in-plane shear test using a test piece of the wooden load-bearing wall with a wall length of 1.82 m.

A gypsum-based load-bearing board fastened, by a fastener, to a wooden wall base used in a wooden framework construction method or in a wooden framework wall construction method, the gypsum-based load-bearing board comprising:

• a main material or a core material formed from a board-shaped hardened gypsum;
• and
• a paper covering at least front and back surfaces of the main material or the core material, wherein the gypsum-based load-bearing board has a surface density or a surface weight, specified as a mass per unit area of a wall surface, in a range from 6.5 kg/m2 to 8.9 kg/m2;
• a lateral nail resistance of 500 N or more;
• and a compressive strength of 6.5 N/mm2 or more,
• wherein the main material or the core material contains glass fiber an starch,
• wherein an amount of the glass fiber in the gypsum-based load-bearing board is 3.0 to 3.5 parts by weight per 100 parts by weight of calcined gypsum,
• wherein an amount of the starch in the gypsum-based load-bearing board is 5.0 to 8.0 parts by weight per 100 parts by weight of calcined gypsum, and
• wherein the gypsum-based load-bearing board has a correction value (Pu′) of an ultimate strength (Pu) of 7.7 kN or more, the correction value (Pu′) of the ultimate strength (Pu) being measured by an in-plane shear test using a test piece of a wooden load-bearing wall that is formed by fastening the gypsum-based load-bearing board to a wooden wall base, the test piece having a wall length of 1.82 m.