On a double plywood floor system can OSB board be used for the bottom layer?

09/14/2018 The MFMA’s Guide Specifications state, “Subfloor shall be 15/32” x 4’ x 8’, minimum 4 ply, American Plywood Association (APA) or flooring manufacturers approved rated equivalent, Rated Sheathing, Exposure 1, or per your MFMA Maple Flooring Manufacturer's design.  APA Oriented Strand Board (OSB) does qualify as an approved subfloor component.
Disclaimer: The MFMA provides general information to architects, specifiers and consumers. The MFMA, its members, officers and agents disclaim any responsibility whatsoever for the accuracy or applicability of these guidelines under all circumstances and conditions.
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