A.Mark Stypczynski, manager of technical development at AkzoNobel/Liquid Nails in Strongsville, Ohio, responds: Two types of sealers meet the American Institute of Timber Construction standards for protecting glulams during transit, storage, and construction (AITC 111-05). One is a translucent penetrating sealer, and the other is a nonpenetrating coating. If your glulam is protected by a penetrating sealer, use a subflooring adhesive that meets either APA specification AFG-01 or ASTM D-3498 (adhesive manufacturers will list one or both of these standards on their product label).

Some of our products that meet these requirements are Liquid Nails Subfloor & Deck Construction Adhesive (product codes LN-602 and, for the low-VOC version, LN-902) and Polyurethane Construction Adhesive (LN-950). Other manufacturers — such as Henkel/OSI, Franklin, and TACC — also have subfloor adhesives that meet the standards.

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