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Old 02-15-2008, 01:32 PM   #16
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Replacing my subfloor


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Dan,

That's it, how else would you do it? Remember though that plywood is thinner than its stated thickness by 1/32". You may need to install a few sheets of tar paper first? Af course be sure to use "subfloor" plywood first then you can go with underlayment on top.

Jaz
If I do two layers of plywood, should I do one layer against the joists, and one with the joists, or both against the joists?

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Old 02-15-2008, 06:13 PM   #17
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Replacing my subfloor


Plywood is ALWAYS installed perpendicular to the joists. Make sure you offset the seams. Be sure to fasten the top sheet only to the subfloor. Do not fasten the top sheet to the joists. Don't forget the proper gaps between sheets and also around the perimeter.

BTW, the subfloor should also be glued to the joists. The underlayment is NOT glued to the subfloor.

Jaz
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Old 02-16-2008, 09:11 AM   #18
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Replacing my subfloor


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Originally Posted by JazMan View Post
Plywood is ALWAYS installed perpendicular to the joists. Make sure you offset the seams. Be sure to fasten the top sheet only to the subfloor. Do not fasten the top sheet to the joists. Don't forget the proper gaps between sheets and also around the perimeter.

BTW, the subfloor should also be glued to the joists. The underlayment is NOT glued to the subfloor.

Jaz
What do you mean by "proper gaps between sheets"? If I use T&G wont the sheets lock in with one another?

How much room should I leave around the perimeter?

So, I will fasten the bottom sheet to the joists with glue AND screws. But how should I fasten the top sheet to the bottom sheet?

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