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Old 10-04-2010, 04:33 PM   #1
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Perimeter expansion gap for subfloor needed?


As my kitchen subfloor (T&G planks, 3/4 inch) had water damage and other general damage, I decided to replace it. I cut it flush with the wall, and will soon be ready to replace it with plywood (T&G, 3/4 inch) plywood. I kept reading that you always need 1/4 " expansion gap around perimeter and 1/8" in-field.

A) Do I need that gap in the perimeter for subfloor?
B) If yes, then pbly do I need support underneath subfloor along the wall (which are perpendicular to joists)?

My thinking right now is to have support under wall edge, leave 1/4" gap then fill it with caulk or other flexible materials.

Then I plan 1/2" plywood (staggered) also with 1/4 inch gap on perimeter
Then radiant floor then ditra then tile...

I hope you guys can help,
Thanks in advance


Last edited by Oakmonter; 10-04-2010 at 05:29 PM.
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Old 10-04-2010, 10:03 PM   #2
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I would block the edges as you discuss.
No gap with plywood. Cut it to within an eighth. Glued and screwed.


Short of cutting off a body part, the worst that can happen in woodworking is manufacturing really nice looking kindling. --- Quoted from lenaitch
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