Tabular data and figures in CSA S406, “Specification of permanent wood foundations for housing and small buildings,” are based upon the general principles provided in CSA O86, “Engineering design in wood” with the following assumptions:
- soil bearing capacity: 75 kPa or more,
- clear spans for floors: 5 m or less,
- floor loadings: 1.9 kPa for first floor and suspended floor, and 1.4 kPa for second storey floor,
- foundation wall heights: 2.4 for slab floor foundation, 3.0 m for suspended wood floor foundation,
- top of granular layer to top of suspended wood floor: 600 mm,
- lateral load from soil pressure: equivalent to fluid pressure of 4.7 kPa per metre of depth,
- ground snow load: 3 kPa,
- basic snow load coefficient: 0.6,
- roof loads are carried to the exterior wall,
- dead loads: roof
0.
50 kPa floor
0.
47 kPa wall (with siding)
0.
32 kPa wall (with masonry veneer)
1.
94 kPa foundation wall
0.
27 kPa partitions
0.
20 kPa