![]() Therefore, for structural panels, the tendency of individual veneers or layers to expand or shrink crosswise is greatly restricted by the relative longitudinal stability of the adjacent plies.Įquilibrium moisture content of solid wood and structural panels at 70° F (21° C)ġ From the Wood Handbook: Wood as an Engineering Material by U.S. The shrinking of solid wood along the grain with changes in moisture content is about 1/20 to 1/40 of that across the grain. When acclimated to ambient conditions or when exposed to elevated humidity or wetting after manufacture, the resultant increase in moisture content can lead to dimensional increase in thickness, length and width, but APA testing shows plywood and OSB exhibit greater dimensional stability than other wood-based building products. The moisture content of plywood and OSB structural panels is generally 2 to 8 percent when manufactured. It is a well-known fact that when wood loses or gains water, it shrinks and swells. Regulation of Wood Packaging Material in International Trade. ![]() Industrial Shelving & Mezzanine Flooring.Residential Cabinets, Countertops & Shelving.
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