Post Tension Loads for Douglas Fir Larch See footnotes
Post Tension Loads for Southern Pine See footnotes
Post Tension Loads for Spruce Pine Fir See footnotes
Post Tension Loads for Hem Fir
Allowable (ASD) loads are based on the 2005 National Design Specification for Wood Construction (NDS) for lumber with a moisture content of 19% or less.
Compression parallel to grain loads are based on an effective post height, le, equal to the nominal height plus 1 1/8" (due to the most common pre-cut stud lengths) minus 4 1/2" (thickness of 3 - 2x plates). L/d ratio is based on d = 3 1/2" for 4-inch wall
and d = 5 1/2" for 6-inch wall.
Shaded values are limited by the Perpendicular to Grain bearing allowable load, Pc⊥, when posts bear on wood sill plates. Where posts and sill plates are different species, Designer shall limit allowable load to the lower of the post capacity or the perpendicular to grain capacity for each species used.
Perpendicular to grain allowable loads do not include the NDS Bearing Area Factor, Cb. For posts whose bearing area is not closer than 3" from the end of a sill plate, the Pc⊥ values may be multiplied by Cb.
lb = Bearing Length (post thickness)
Cb = Bearing Area Factor per NDS 3.10.4
Allowable tension loads are based on net section assuming hole size equal to bolt diameter plus 1/16" with the hole drilled on the 3 1/2" face of post for a 4-inch wall and on the 5 1/2" face of post for a 6-inch wall. Tension loads have been increased for wind or seismic loading with no further increase allowed. Reduce where other loads govern.
Values do not consider combined axial and out-of-plane bending.
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