Reply to Heating Room Above Crawl Space

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[quote=ZachF]Your crawlspace needs to be completely sealed.  The term is, encapsulated.  It should have at least a 2" thick foam insulation board adhered to all the exterior walls and at least a 20 mil thick liner fully covering the ground and adhered to the foam board with no gaps in the liner at all.

If the crawl has vents, they need to be sealed and the insulation should be removed from between the joists.  Last step is adding a high capacity dehumidifier and drainage system if you have any water collecting in the crawl.

No doubt you are venting in warm air in the summer (cold in the winter) which then raises the humidity in there as warm, moist air cools and the relative humidity goes way up.  The insulation traps the moisture against the joists and sub floor which can lead to wood rot, termites, rodents and other creepy crawly things, not to mention sagging joists as they get weakened.

If it were properly sealed, including a well built, insulated crawl door that forms a seal when it is shut, you would not need insulation and you would find it much easier to heat and cool using less energy.  Allowing the wood to dry out will also insure you don't get termites or carpenter ants plus you won't have rodents nesting and breading in there.[/quote]

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