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Old 10-04-2010, 05:33 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 06:29 PM.
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Old 10-04-2010, 11:03 PM   #2
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Perimeter expansion gap for subfloor needed?

I would block the edges as you discuss.
No gap with plywood. Cut it to within an eighth. Glued and screwed.


Originally Posted by Bud Cline View Post
Go ahead and apply for a variance, those guys at City Hall can use a good laugh.
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