Latest Discussions : HVAC


04:56AM | 07/20/04
Member Since: 07/19/04
1 lifetime posts
I have built a new addition with a cathedral ceiling. I am going for a rustic look and I am thinking of putting galvanized tin on for a ceiling. I put r-30 in the rafters and I am putting 1/2" furring strips under rafters to attach metal to. Has anyone done this? My biggest fear is condesation on the metal if a draft comes through the insulation. Should I install a vapor barrier over the insulation and if so what would you recommend?


09:41PM | 07/25/04
Member Since: 01/28/03
693 lifetime posts
If you fiberglass batt insulation with a kraft faced paper vapor diffusion barrier oriented toward the living space...

And if you placed the kraft paper tabs over the face of the rafter as the manufacturer requires...

Then you already have in place all the 'vapor barrier' that is required...and the 1/2' furring strips are irrelevant.

Properly ventilated rafters will never allow cold air to enter ceiling living spaces since the flow of air will always be 'out' and 'up' never 'in'.


10:20AM | 07/26/04
Member Since: 01/02/03
31 lifetime posts
My suggestion..... USE a vapor barrier!!!! 30# felt or at least plastic. I have a metal roof strapped over an existing roof. It still gets some condensation on the BOTTOM of the metal. Do something, or I think..... you'll be sorry!!!

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