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WWPA: Online Western Lumber Product Use Manual
US Western Wood Products Association online Western Lumber Product Use Manual is a comprehensive technical manual on WWPA lumber products, featuring basic categories of lumber, grades, sizes and species groups, Base Values and adjustment factors for dimension lumber, along with design values for structural decking, MSR lumber, structural-glued products along with posts and timbers. Also includes end-use recommendations and specification guidelines, section properties, relative mechanical properties, appearance lumber grades and sizes and industrial products. (PDF)
Issues & Performance

CUFCA: Water Vapor Permeance Of Wood Framing
Canadian Urethane Foam Contractors Association report on Evaluation of the Water Vapor Permeance of Wooden Framing Members summarizes evaluation of several samples of two-by-four and two-by-six wooden framing members, in accordance with ASTM E96 - 05 Standard Test Method for Water Vapor Transmission of Materials. (PDF)

JLC: Does Lumber Grow Stronger With Age?
Journal of Light Construction explains why old wood might be stronger, but probably is weaker, than the day it was first used to build a structure.
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