Architecture - 1X8 12in spaced floor joists?

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dannywild
05-17-07, 01:52 PM
Hello all,

I have a carpenter that is telling me that 1X8 12in spaced floor joists with a 1/2in thick plywood subfloor is as strong as any other combination. Is he high on something? It doesnt sound right when everyone talks about 3/4 OSB subflooring. What am I missing?

Thanks!

Wirepuller38
05-17-07, 02:10 PM
You are missing a good carpenter. Find one who knows what he is talking about.
Pecos
05-17-07, 04:07 PM
Wow! Think how hard it would be to nail into the edge of a 1x8.

chandler
05-17-07, 08:53 PM
Certainly he was talking about 2x8 lumber, not 1x8. In addition he will have to justify the span.
dannywild
05-18-07, 06:56 AM
Sorry I was talking 2X8... must hit a 1 by mistake. But can 2x8 12 inch on center be enough to thoroughly support a 1/2 inch subfloor?
Pendragon
05-19-07, 06:05 AM
12" spacing seem odd when the standard is 16".

It may very well be enough for a 1/2" sub floor, but I wouldn't accept a 1/2" sub. 3/4" would be the minimum, preferably T&G ply or osb.

As for it being a 2x8, that's going to depend on the span, and the lumber used for the joists.