Don't force-fit the tongue and groove joints. Oxboard's edge has been designed to allow for expansion and contraction. Panel ends should be spaced 1/8". For best results, follow the APA glue-nailing techniques, which help eliminate squeaks, bounce, and nail popping.
Use only solvent-based adhesives conforming to APA specification AFG-01.
Oxboard 23/32 Tongue and Groove has the national Oak Floor Manufacturers Associationís approval as a satisfactory subfloor under hardwood flooring.
Oxboard Sturd-I-Floor products are touch-sanded for consistent thickness. Only the top is sanded, which helps to control the water absorption properties on the surface of the panel. Any swelling resulting from adverse moisture exposure should be allowed to dry thoroughly, then sanded.
As with plywood, an additional thin layer of underlayment should be placed over Sturd-I-Floor when installed under tile, linoleum or vinyl floor coverings.