plywood over old softwood planks

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Old 03-30-16, 07:56 AM
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plywood over old softwood planks

Hi,
my old sub-floor in the second floor bedroom consists of 5" planks. I was advised to glue and screw 1/2" plywood on top of it. I'm undecided about the actual floor, but currently leaning toward pre-finished, T&G engineered hardwood.

Most discussions about glue deal with installations over concrete. What would be the right choice of glue under the plywood (if any) and under the floor?
 
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Old 03-30-16, 09:50 AM
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Any plywood you add an top of a subfloor should never be glued, since tearing it up someday would destroy the subfloor. You should screw your planks, set all nails deeper with a nail set, then add the plywood thickness of your choice, screwed to the planks only, not the joists.
 
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