Timber Wall Quantity Calculator

Check required vs existing wall bracing for timber-frame houses per Japanese Building Standards Law — free seismic design tool

Building Conditions

Number of Stories

Roof Type

Heavy (Tile)Light (Metal)

Zone Factor Z

Ground Condition

Floor Areas

1F Floor Area (m²)

2F Floor Area (m²)

Existing Wall Lengths

1F X-direction (m)

1F Y-direction (m)

2F X-direction (m)

2F Y-direction (m)

Required Wall Coefficient Table

Stories	Floor	Heavy Roof (cm/m²)	Light Roof (cm/m²)
1F bldg	1F	15	11
2F bldg	1F	33	29
2F bldg	2F	21	15
3F bldg	1F	50	46
3F bldg	2F	37	34
3F bldg	3F	24	18

Assessment Results

1F (60 m\u00B2)

Coefficient: 33 cm/m\u00B2 | Required: 19.80 m

X-direction

Y-direction

2F (50 m\u00B2)

Coefficient: 21 cm/m\u00B2 | Required: 10.50 m

X-direction

Y-direction