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Old 08-22-2016, 09:19 AM
 
1 posts, read 618 times
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Hello, I have been reading this post and I am having similar issues when it comes to buying a house. I live in SC and humidity is out of control! If I were to close the vents, add the moisture barrier, and get a dehumidifier, would there be any need for insulation under the floors? I have been told no insulation is best and am currently going this route. The lumber is now treated where the mold grew on some floor joists. Also, the house is around 2,000 square ft. Would anyone know how much money was saved by not buying the insulation?
Thanks so much!!
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Old 08-22-2016, 05:03 PM
 
28,455 posts, read 85,095,738 times
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Here is the defining study -- http://www.lsuagcenter.com/~/media/s...oorslowres.pdf

Quick summary-- USE THE RIGHT PRODUCT in the correct manner:
Quote:
"Foil-faced rigid foam and closed cell sprayed polyurethane foam exhibited good performance, keeping subfloor moisture content within acceptable levels. "
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Old 08-22-2016, 10:10 PM
 
2,332 posts, read 2,533,726 times
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In a word...no. You don't NEED insulation, but if you choose to install it, then the materials noted by Chad are good choices. Personally, I don't see any benefit to spending the money. Spray foam is expensive.
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