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Our subfloor is reinforced by an additional layer of 1/2" plywood. Does it still make sense to put underlayment for sound/thermal proofing?

by LiveModern Webmaster last modified Feb 05, 2015 01:00 AM
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by last modified Feb 04, 2015

The extra layer of plywood is put on the subfloor to address the issue of joists going different directions and our wish to have a clean look of the hardwood - all boards going the same direction. The contractor recommended the extra plywood layer to avoid floor sagging where the boards would go in parallel to the joists. In such case, would high quality underlayment which we purchased stil makes sense? Or the plywood will play adequate role for sound reduction, thermal and moisture protection? This is first floor of the house, beneath which is crawl space.




 

 

The extra layer of plywood is put on the subfloor to address the issue of joists going different directions and our wish to have a clean look of the hardwood - all boards going the same direction. The contractor recommended the extra plywood layer to avoid floor sagging where the boards would go in parallel to the joists. In such case, would high quality underlayment which we purchased stil makes sense? Or the plywood will play adequate role for sound reduction, thermal and moisture protection? This is first floor of the house, beneath which is crawl space.

Marius, Placing the thermal and moisture protection between the floor joist and hardwood is incorrect. A minimum of 60 mil vapor barrier for thermal and moisture protection should always be...


 

 

 
 
 

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