Dry Crawl Space Liner?

kbsparky

I saw this product for crawl spaces .... anyone here had any experience with this type of preparation?

JonM

Wouldn't a roll of 6 mill poly do the same thing?

Burby

It is becoming the thing to do in high humidity climates. Such as South East coastal areas. Foundation vents only allow more moisture under your home, contributing to the moisture already there from soil conditions and hvac line condensation leading to wood decay, mold, insect infestation, ect.
Seal up the ground & walls, add a dehumidifier and you have a dry enviroment.
But as with anything, it is only as good as installed.
With it being the new "in" thing to do there are problems already coming up with poor installations.

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kbsparky

What kind of problems?

The quote I received stated they would stop the wall coverings 3 inches below the sill plate. Another quote would cover the outer walls all the way up to the sill plate.

I figure its best to leave a small gap so if termites ever decided to arrive, at least their "tunnels" would be needed and obviously apparent.

neolitic

????? That's the way I've treated crawls
for 30+ years.
6mil on the floor and 2' up the walls.
2" styrofoam from the sill down, and
stuff the joist pockets and rim joist
with R-13.

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Aaron111

thats some good cushion for a crawl space lol

Burby

That is great if codes allowed you to do this. Here in the Charleston, SC area Inspectors wanted to see foundation vents & insulated floors with R 19. The poly, unless standing water, typically decided by termite companies. Operative Vents once used to allow closing, had to have the operative part removed or would not pass inspection.
With the new IRC they scratched their heads even more and for them the simple way was have an Engineer give them a letter and they would consider it.
Now they do accept it.
Others I have spoke with in Ga and Fla said they went thru the same thing trying to change over.

The problems have seen are now allowed & everyone doing the installs, not taping the poly seams, using walmart dehumidifiers in the crawl spaces, turning up the poly at the walls / hanging the curtin & not taping, tears in the poly from leaving debris under, just foolish problems give it a bad name.
If done right, is a great idea and glad we finally can apply it here.

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neolitic

Yeah, when they wanted operable vents here
I just when back with foam ans fiberglass
and blocked them after final inspection.
Never did see HO around here that
opened/closed the damn things past
the first year anyway.

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