Can hardwood flooring be installed on floor systems with 24" o.c. joist spacing?
The National Wood Flooring Association (NWFA) has become the leading organization for wood flooring certification and the predominant source for proper installation of wood flooring. The NWFA Installation Guidelines provide information on proper acclimation, subfloor guidelines and specifications, and installation guidelines.
Although 23/32" OSB is span-rated for floor joist systems spaced at 24" on-center, NWFA believes a thicker subfloor is necessary to reduce deflection of the subfloor and minimize pops and squeaks in the wood flooring. Therefore, the NWFA recommendation is to use a 7/8" thick OSB panel for floor systems spaced at 24" on-center.
Part III of the SUBSTRATES:Wood Subfloor section of the installation guidelines gives general subfloor installation info as well as recommended panel thicknesses. Glue-nailing of the subfloor panel to joist is generally recommended. 23/32" OSB is recommended for joist spacing up to 19.2" on-center. 7/8" OSB is recommended for spacing up to a maximum of 24" on-center while 1 1/8" OSB is recommended for spacing up to 32" on-center.
Edge Gold™ Code Conformance and Availability
Edge Gold™ floor panels are manufactured in accordance with Voluntary Product Standard PS2 and CAN/CSA-0325 with an Exposure 1 bond classification. 7/8" Edge Gold™ floor panels are available through Weyerhaeuser Wood Product Dealers and Independent Distributors.