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Using screws after thinset has dried

Posted by Vince on November 24th, 2002 09:10 AM

I put a layer of thinset on a 3/4" plywood subfloor, then 1/2" hardibacker, then screwed it down. Today, I noticed that I missed spots where I should have put more screws. Can I put in more screws now that it is about 20 hours later or will I run the risk of loosening up some of the hardened thinset underneath the cement board? Thanks.

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