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Taplight 09-07-2011 11:40 PM

5/8" OSB as a subfloor.
I'm planning on installing 3/4" maple hardwood floors on the upper level of my home. The subfloor I discovered when I pulled the carpet is 5/8" OSB. I plan on laying the planks perpendicular to the joists (16" on center). Can I do this? Is the subfloor sufficient? What would I need to add if it's not good enough. I'm hesitant to add more subfloor as it will make the top step of the stairs much different then the the other steps.

Looking for advice,


JazMan 09-08-2011 09:15 PM

You're fine, especially since you're installing hardwood. Your instructions should also mention subfloor requirements.


Floor Doc 09-08-2011 10:38 PM

"Acceptable Panel Subfloors: Truss/joist spacing will determine the minimum acceptable
thickness of the panel subflooring.

1. On truss/joist spacing of 16 (406mm) o/c or less, the industry standard for single-panel
subflooring is nominal 5/8 (19/32, 15.1mm) CD Exposure 1 Plywood subfloor panels
(CD EXPOSURE 1) or 23/32 OSB Exposure 1 subfloor panels, 4 X 8' sheets. "

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