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Unread 01-12-2021, 04:53 PM   #2
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Join Date: Jul 2005
Location: Fairfax, Va
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Welcome, Stephanie,

Are you certain the first layer of subfloor is 1/2"? If it is, it's not tongue and groove. Do you know if it is plywood or OSB? And the 2nd layer, certain it's 5/8" ? Is it T&G? Plywood or OSB?

Over and above that....well, under and below that, do you know what the joist structure is;? Are they 2X8's, 2X10's, something else? How about the unsupported span of those joists, as well as the spacing of those joists?
If I recall correctly my memory is excellent, but my ability to access it is intermittent.

Last edited by ss3964spd; 01-12-2021 at 05:29 PM. Reason: edited to include joist spacing
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