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Wood Designation Question

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James F Fulton wrote:

>>What do the designations stamped "Hem-Fir" and "S-P-F" on stand for and 
mean for purpose of wood design ?  I have an idea but cannot find this 
discussed in the references I have. Thanks.<<


These are designations for mixed species, i.e., lumber harvested from stands 
of timber that have both, or all, of the species growing in it and it would 
be uneconomical to separate them.

Hem-Fir is the grouping for lumber that may be Hemlock or a Fir.

S-P-F is for the grouping that may be Spruce, Pine or Fir.

Doug Fir - Larch is for the grouping that may be Douglas Fir or Larch.

WW is for an all encompassing group of western woods.

The species that are included in each of the mixed species designations is 
shown on one of the front pages of the NDS.

Hope this helps.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona