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Originally Posted by landarc
You know, if you are going to heat it, in fact, just in general, any greenhouse attached to a structure should have particular attention paid to moisture proofing and vapor control between any existing wood structure and the greenhouse area.
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Good point. landarc
To be considered:
1. Moisture forms on surfaces that's colder. If your house is warmer, moisture is not a problem; however, if the garage is colder, moisture will condense on the garage area.
2. Moisture vapor can migrate thru structure unless vapor barrier is used. They sell vapor barrier paint.
3. some commercial greenhouse frames has built-in gutter system to drain away water.
4. some plastic wall panels are treated to "sheet" water away.
5. Treated wood should be used if possible. Check and avoid if the wood is treated with arsenic.
dcarch