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Old 12-02-2012, 03:05 PM   #1
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Vapor barrier Question


Purchasing a home built in 1968 in Savannah GA. Crawl space is only about 2' off ground. Dirt but inspector advised very dry but recommended a moisture barrier.


Couple of questions.

I see many different materials such as silverback vs poly? What should be used?

How should it be installed? I get the overlap, but does it need to go up the foundation walls? If so how far?

Do I need to any ground uncovered. It has foundation vents to code supposed, do I need to close them.


Help on what I need to do to get the crawl space improved to the right condition for the long term.

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Old 12-02-2012, 04:16 PM   #2
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Vapor barrier Question


I found this on quick google search. Hope it's helpful
http://www.familyhandyman.com/DIY-Pr...space/View-All


You can search right on DIY also

http://www.diychatroom.com/search.php?searchid=3636496

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Last edited by orange; 12-02-2012 at 04:18 PM. Reason: added the DIY link
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Old 12-02-2012, 07:23 PM   #3
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orange, your last link didn't work for me...

Rundle, check with your local AHJ if you permanently close them off. eg.;

"R408.3 Unvented crawl space. Ventilation openings in under-floor spaces specified in Sections R408.1 and R408.2 shall not be required where:

1. Exposed earth is covered with a continuous Class I vapor retarder. Joints of the vapor retarder shall overlap by 6 inches (152 mm) and shall be sealed or taped. The edges of the vapor retarder shall extend at least 6 inches (152 mm) up the stem wall and shall be attached and sealed to the stem wall; and 2. One of the following is provided for the under-floor space: 2.1. Continuously operated mechanical exhaust ventilation at a rate equal to 1 cubic foot per minute (0.47 L/s) for each 50 square feet (4.7m2) of crawlspace floor area, including an air pathway to the common area (such as a duct or transfer grille), and perimeter walls insulated in accordance with Section N1102.2.9; 2.2. Conditioned air supply sized to deliver at a rate equal to 1 cubic foot per minute (0.47 L/s) for each 50 square feet (4.7 m2) of under-floor area, including a return air pathway to the common area (such as a duct or transfer grille), and perimeter walls insulated in accordance with Section N1102.2.9; 2.3. Plenum in existing structures complying with Section M1601.5, if under-floor space is used as a plenum."From: http://publicecodes.cyberregs.com/ic...9_4_par111.htm
Always check to see if in a radon zone before covering; http://energy.cr.usgs.gov/radon/rnus.html
Gary
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Old 12-02-2012, 08:08 PM   #4
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Gary,
Strangely it doesn't work for me either. When I was in the forum earlier, I did a search on
"moisture barrier crawl space" it gave me a result and a link. I recorded the link and posted it.

Perhaps the link is only good for me while I'm in "that current" session????

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Old 12-02-2012, 08:12 PM   #5
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http://www.diychatroom.com/search.php?searchid=3637009

I just tried it for you, works now. We have been having trouble on our site today/tonight, it usually clears by itself. At least, "I know nothing" about that, lol.

Gary
P.S. Your first link did mention contact local AHJ, twice, which is good. I try to remember to suggest checking for radon areas when covering dirt with plastic; http://energy.cr.usgs.gov/radon/rnus.html

I didn't mention it because the OP wasn't in a "high" area, though a good idea to use them together for others in other locations. I add "termite" protection as well; leaving bare concrete/block for inspection area at top 3" on wall; http://termites101.org/termite-basic...ites-by-region

Gary
PS. Glad you are using the "search box", few do...
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Old 12-02-2012, 08:16 PM   #6
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Yes it's working at the moment. I wonder if it will still be valid if you log off?
It may just be a temporary search for the life of your session.


I know that I posted the link that appeared with the search results???

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Old 12-02-2012, 08:42 PM   #7
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I don't understand it myself. In the past, I have posted similar "search" results and it worked for a few days...., then didn't work. One of those mysteries...Que "weird music", lol.

Gary

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