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Old 09-12-2016, 05:50 PM   #1
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Subfloor question


I have a 3/8 subfloor and want to install wood laminate flooring. Should I add another layer of plywood before installing the floating floor?
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Old 09-12-2016, 07:00 PM   #2
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Re: Subfloor question


I'd be amazed if you only had a 3/8 thick subfloor, if that was true it would be flexing and cracking and some one would have fallen through it before now, when they walked on it.
Not even 1/2" is a proper subfloor.
Sure that's not 3/8 over a real subfloor?
Got central heating vents in the floor?
Pull one out and see what's really there for thickness.
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Old 09-12-2016, 07:07 PM   #3
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Re: Subfloor question


I just checked it sure enough it's 3/8


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Old 09-12-2016, 07:48 PM   #4
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Re: Subfloor question


If it truly is 3/8" all by itself then yes, you need more. 1/2" would give you 7/8" total. Glued and screwed. You will have to accommodate any height transition issues with adjacent flooring.

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Old 09-12-2016, 09:34 PM   #5
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Re: Subfloor question


Of the thousands of jobs I've been on or just estimated, I've seen ⅜" subfloor twice. Of course there was a second sheet of plywood over it, but still.....cheap a** builders.

Obviously the top layer of underlayment has been removed right?

We normally would not recommend gluing the underlayment to the subfloor or nailing into the joists, but in this case I would do both since fasteners into ⅜" has almost nothing to bite into. Treat this as if the ⅜" isn't there.

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Old 09-12-2016, 09:48 PM   #6
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Re: Subfloor question


Ok I think I will add another layer of 3/8 plywood. What glue should I use and should I lay it parallel to the joist or horizontal because the subfloor is going horizontal the joists.


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Old 09-12-2016, 10:09 PM   #7
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Re: Subfloor question


Who said anything about ⅜"?

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