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moisture barrier under raised home

Posted on 8/5/19 at 10:30 am
Posted by robot55
Member since Dec 2008
872 posts
Posted on 8/5/19 at 10:30 am
recently had a termite inspection and guy said it was a little damp and muddy. no mold or anything but mentioned they could install a moisture barrier, which i guess is just a big sheet they lay on the ground.

Anyone have any experience with this? think it would be worth it? Thanks
Posted by NATidefan
Two hours North of Birmingham
Member since Dec 2008
36074 posts
Posted on 8/5/19 at 10:33 am to
Yes you should have it done.

But its just thick black plastic that is spread out over the ground and maybe weighted down with some concrete blocks or bricks here and there. Pretty easy to yourself.

But get you some knee pads if you decide to DIY.
Posted by NATidefan
Two hours North of Birmingham
Member since Dec 2008
36074 posts
Posted on 8/5/19 at 10:43 am to
Oh and another tip my home inspector gave me is to get a metal grate for your crawl space door and replace the solid one during the hotter humid months of the summer. Install it at the beginning of June and then go back to the solid one mid September or something like that.

Also be sure to open your vent grates at the same time and close at the same time.

Will help it breath and dry out.
This post was edited on 8/5/19 at 10:45 am
Posted by Motorboat
At the camp
Member since Oct 2007
22685 posts
Posted on 8/5/19 at 12:14 pm to
Lemme guess. Terminix? They are looking for ways to expand their business. Get a second opinion. If you are not having problems with moisture in your floors, don't mess with the equilibrium-- it could lead to more trouble.
Posted by NATidefan
Two hours North of Birmingham
Member since Dec 2008
36074 posts
Posted on 8/5/19 at 12:36 pm to
If you get a second opinion have them take moisture readings.

But if it truly is damp and muddy you should probably have it done IMO. That's what my home inspector said.

And I would go under myself and take a look. Damp is one thing, but it definitely shouldnt be muddy. Make sure you dont have any water under the house for sure. Sometimes it can seep back under if your gutter system isn't working properly, etc.
Posted by TigerBalsagna
tRedStick
Member since Jan 2015
729 posts
Posted on 8/5/19 at 12:49 pm to
I ordered a roll of plastic and DIYd this. Giant pita, but crawling around under there was way better on plastic.
Posted by robot55
Member since Dec 2008
872 posts
Posted on 8/5/19 at 12:56 pm to
yes, it was terminix. Their guy is suppose to come tomm to give me a quote. Il get under there tonight to put my eyes on the situation. Thanks for the replies guys
Posted by fishfighter
RIP
Member since Apr 2008
40026 posts
Posted on 8/5/19 at 1:00 pm to
OP, you have any insulation right under the floors? If not, spring for someone to come in and spray some closed cell foam. That acts as a moisture barrier and helps save you money for heating and cooling.
Posted by zackcary
Member since Jun 2011
284 posts
Posted on 8/6/19 at 3:29 am to
Wouldn't do it. Can hold moisture against the floor causing rot.
Posted by fishfighter
RIP
Member since Apr 2008
40026 posts
Posted on 8/6/19 at 6:50 am to
Close cell will not let moisture thru.
Posted by convertedtiger
Baton Rouge
Member since Aug 2010
2786 posts
Posted on 8/6/19 at 8:06 am to
quote:


Close cell will not let moisture thru.


But it will trap what is already there. Also, It depends on what covering they have on the floors in the house. Something impermeable like solid sheet vinyl, they WILL rot out the floor in short order.
Posted by Hammertime
Will trade dowsing rod for titties
Member since Jan 2012
43030 posts
Posted on 8/6/19 at 8:40 am to
IIRC, the scientists at LSU said taped-up insulation board is best for underneath a house as far as moisture and blocking temp transfer is concerned
Posted by GeauxldMember
Member since Nov 2003
4388 posts
Posted on 8/6/19 at 8:44 am to
quote:

Close cell will not let moisture thru.



That’s its blessing and curse. It’s a good product, but you have to make sure the wood’s moisture levels are within the manufacturer’s spec before applying (this is why it’s best applied in winter/spring here in LA).

Then, there’s a concern on leaks, toilet seal ring, etc, since that water will have nowhere to go and rot the subfloor, possibly more. The other poster brings up another good point about the possibility of the subfloor being sandwiched between two moisture barriers and unable to exchange humidity properly.

As mentioned above, I still think it’s a great option for insulating and providing moisture barrier in a crawl space application. You just have to know all the info going in.
Posted by CrawDude
Baton Rouge
Member since Apr 2019
5267 posts
Posted on 8/6/19 at 10:03 am to
quote:

IIRC, the scientists at LSU said taped-up insulation board is best for underneath a house as far as moisture and blocking temp transfer is concerned


This is the report on the LSU AgCenter study. Insulating Raised Floors in Hot, Humid Climates
Posted by VernonPLSUfan
Leesville, La.
Member since Sep 2007
15851 posts
Posted on 8/6/19 at 1:33 pm to
Good reading there, thanks.
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