(I posted this on the Carpentry section, forgive the cross post but afterwards I thought it should be posted here.)
I gutted my kitchen and dining room, down to the rafters/studs and under layment.
The existing sub floor is one layer of 1/2" (15/16") plywood over 2x8s 16" on center. The sub floor is very soft, bouncy and in some areas feels like you can fall through if you step hard or jump. The 2x8s are not bouncy, just the plywood.
Before I cover with finished floor - which will be 3/4" solid hard wood (Brazilian Cherry) 4" tongue-in-groove is dining area, 1/4" durock covered with 12x12 tiles on thinset in kitchen - I plan on covering the existing sub floor with a 2nd layer of 4x8x1/2" fir plywood. Was planning on nailing the fir sheeting down with 3" full round head glue tipped nails dispensed from a pneumatic framing nailer.
Ok, that's the background, now for the question.
To avoid squeaks, should I use construction adhesive between the existing and new layer of sub floor sheeting? I think this would stiffen the floor by bonding the two layers of sub floor together, and avoid any squeaks down the road.
Any experience/thoughts on this is appreciated.
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