Heated attached garage insulation question

Old 11-06-02, 03:35 PM
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Heated attached garage insulation question

My attached garage is down to the rafters and studs. I have a question regarding the vapor barrier.

For the ceiling, what type of vapor barrier should I use? The garage will be heated in the winter. Are there vapor barrier faced bats for the ceiling or do I need to put up a poly sheet first and use unfaced bats. It is a truss structure with 24 inch centers.
Old 11-16-02, 05:12 AM
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If you use a poly vapour barrier, remember the barrier goes on the warm side of the insulation. So batt insulation, then vapour batrrier. The attic space of the garage should be ventilated as well via soffit & ridge vents.
Old 11-16-02, 08:26 AM
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Why do you want to install less than 10% efficient FG mater'l?

The fact that you have to put up a plastic sheet to keep the condensation from ruining your dry wall should be a red flag.

Install a 95%, 2 layer, radiant barrier system and and you will get superior performance without all the FG problems.

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