I plan on encapsulating and closing off the two vents in my crawlspace according to the latest methods for doing so. One of which (recommended by Martin Holladay, Energy Vanguard website, not sure of his last name spelling) is insulating the rim joists, insulating the walls with rigid foam panels, then covering everything with thick plastic sheeting. My crawlspace is only 3 ft high or so and thankfully the floor is poured concrete throughout. Do I need to also place plastic on the floor? I live in southeastern PA. I also plan on adding a dehumidifer.The crawlspace connects to my unfinished basement which also has a dehumidifier.
The Cliff Notes versions of the three options in this situation are:
1) One is to close off the vents, insulate, and add a dehumidifier.
2) The other option is to close off the vents, insulate and provide some conditioned air and install a floor register.
3) Mechanically vent the crawlspace with a small fan rated for the square footage of the crawlspace in cfm.
I'm choosing the first option.
To repeat my question, do I need to put plastic down on the poured concrete floor too?
I didn't find the right solution from the Internet.
http://forums.finehomebuilding.com/brea ... lastic-too
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