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renodave

07:46PM | 12/05/04
Member Since: 12/05/04
1 lifetime posts
Bvhvac
I need to insulate the floor of 2 bedrooms above a garage. Josts are 2x10, subfloor is 5/8 plywood. That's all that's there at this stage. How can I provide a suitable vapour barrier on the warm side (the top)?

microfoil

05:52AM | 12/07/04
Member Since: 12/01/04
7 lifetime posts
Use microfoil to insulate, and to get the vapor barrier. The material is a perfect thermal break as well as being super easy to use. Remember heat seeks cold. call 602 528-3645 and I will explain.

ASTA Danno

david_wv

03:27AM | 12/08/04
Member Since: 01/28/01
171 lifetime posts
I would look up what's needed to insulate over an unheated crawlspace. Check out US Dept of Energy, or an insulation manufacturer for guidelines.

I would pull up the subfloor and insulate with faced fiberglass batts (personal preference). Normally the facing goes to the warm in winter side to prevent moisture from entering and condensing in the insulation. I wonder if insulation over a hot humid attic would also absorb moisture.

If you have room to work and put the subfloor to one side, I would lay the batts with the facing down and tack large sheets of plastic across the top of the joists before putting down the subfloor. This should keep moisture out of the insulation.

Alternatively lay the facing on the bottom and make sure the garage ceiling has a good, thick coat of paint.

david_wv

03:31AM | 12/08/04
Member Since: 01/28/01
171 lifetime posts
Sorry - goofed on the last suggestion.

Insulation facing goes up to the warm in winter side.
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