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Old 06-26-2015, 09:28 PM   #1
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subfloor sagging


Installing a subfloor over a cement slab to make it level with the rest of the house. Everything is going well, gluing and screwing all the T&G 3/4 plywood into the joists. 24" OC with blocking every 4 feet. Have put in about half the flooring and it seems very strong... but when we walk over one particular section, it makes a "crackly" noise.... like stepping on leaves almost and seems weak. It seems isolated to about a 2x4 section.

What could be causing this? Do I need to replace this piece of subfloor? Should I just cut out the offending section, install some more blocking and replace with some more 3/4 scrap I have?
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Old 06-26-2015, 09:53 PM   #2
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Take that panel up and install another in its place, check for sound... Did you add a waterproof material to the slab before the framing, esp. if a garage addition? Did you glue the tongue and groove joints as well? Could be the glue in ply separating from factory install defect... or add blocking there.

Gary
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Old 06-27-2015, 06:53 AM   #3
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Slabs are never flat, may need some shims.
Did you crown the joist before installing?
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Old 06-27-2015, 09:39 PM   #4
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Thanks, I ended up pulling up the sheathing panel in question and replaced it. Went swimmingly after that. The sheet was defective it appears.
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