Quote:
Originally Posted by aerohead
If you have un-vented gas heating in the home, you'll be loading the interior air with water vapor. It will do all it can to permeate floors, walls, and ceiling.
Any surface below dew-point that it can reach will produce condensation, bacterial activity, rot, and attract termites. It's why 'TYVEK' or related breathable barriers are mandatory in all new construction.
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As construction methods in my country often differ a lot compared to what is done in the USA, Tyvek and similar materials are more often placed below the roof tiles, and it's still not much common. But anyway, besides preventing the moisture from being trapped inside, another matter of concern for me would be the air renewal, exhausting COČ too.