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, Fri, 9 Jan 2004 13:14:33
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What is your climate?
Is the soil in the crawl space typically wet or dry?
Does your crawl space need to be vented to supply the furnace with combusion air?
Condensation would only occur if the wood was below the due point of the air. That cannot happen in the winter when you are heating the interior. In the summer with AC, as air chills against the subfloor it will then sink and the wood surface will not get much cooler than the ambient air.
So I can't see why you need condensation protection.
And such sealants do repel liquid water, but do not seal against water vapor at all. So if a due point occured within the middle of the subfloor, their could be condensation there and there is nothing that you can do to stop that. So you would not want to have a plastic vapour barrier on the inside as you would want to allow the vapor to come on through to the cooler and dehumidified side.
You can't put a vapor barrier under the floor on the sub floor or the joists as moisture from the interior would condense there in the winter.
If your crawl space is closed off, the temperature differences between the interior abd the crawl space will not be very great. The furnace and pipes will tend to heat and cool the space as well.
In the summer if the furnance pipes are not insulated, then the ducts may sweat when on AC. If the ducts are insulated, this can still occur as the duct is not water vapor permiable and the insulation almost always is.
In the winter if the space is closed off, air as it warms against the subfloor will form a stagnet layer and this will be self insuating from a convection point of view. But there will be ratiation losses to the soil or cold walls in view of subfloor surfaces. In the summer, as chill from the interior goes through the floor, cold air against the subfloor sinks and you get conventive heat loss and radiative gains from the soil and walls in view. If the subfloor is vented to feed the furnace, things get more complicated. A high efficiency furnace that takes in combustion air through a duct would be better.
You can install insulation (craft papper faced figerglass) that is moisture permiable and not have any condensation against a vapor barrier.
If you need termite protection... thats a different topic.
posted by 66.139.123...
, Fri, 9 Jan 2004 13:14:33, Fri, 9 Jan 2004 15:43:10
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