Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 07-03-2011, 01:16 AM   #1
Newbie
 
Join Date: Jul 2011
Posts: 3
Share |
Question

crawl space vapor barrier help


I just bought my first house. (FYI)
Its a single level ranch with a crawl space.
The crawl space has some type of clay.
No signs of mold. The crawl space has two outside wall vents.
The A/C drains in to the clay so I plan to install a condensation pump.

There is a plastic vapor barrier down there but it has many holes and covers about 60-70% of the soil/clay. (the crawl space is about 26'x41')

I want to install a new vapor barrier.
Here is the question, Can I install the NEW vapor barrier OVER the OLD one?

My thinking is that moisture will get trapped in between the layers THEN cause mold.

The photo shows the condition.

Eddie Bear is offline   Reply With Quote
Old 07-03-2011, 06:25 AM   #2
Member
 
Join Date: Mar 2007
Location: Long Island, NY
Posts: 9,519
Default

crawl space vapor barrier help


I'd clean out all the garbage(old barrier included) and put down a new barrier that covers the whole floor.

__________________
Ron
"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety."
B. Franklin 1759
Ron6519 is offline   Reply With Quote
Old 07-03-2011, 10:15 AM   #3
Newbie
 
Join Date: Jul 2011
Posts: 3
Default

crawl space vapor barrier help


Thanks Ron.
That's what I though. There is garbage down there (old shoes, tile, pipes).

Is it bad to have the barrier over the cast iron drain pipe?
That's how it is now. I a little worried about tampering with pipes that old. (I have that kind of luck)
Eddie Bear is offline   Reply With Quote
Old 07-03-2011, 10:26 AM   #4
Newbie
 
Join Date: Jul 2011
Posts: 3
Default

crawl space vapor barrier help


OK, then about the mil of the plastic. Between 4, 6 and 10 mil, 10 would be best right?
I see 20'x100' 10 mil online for $119 (Home Depot its $199).
Is the higher the mil, the thicker the plastic?
Eddie Bear is offline   Reply With Quote
Old 07-03-2011, 02:28 PM   #5
Member
 
AGWhitehouse's Avatar
 
Join Date: Jul 2011
Posts: 1,378
Default

crawl space vapor barrier help


You can cover the pipe and yes the higher the mil, the thicker it is.
AGWhitehouse is offline   Reply With Quote
Old 07-03-2011, 04:02 PM   #6
Member
 
Join Date: Mar 2007
Location: Long Island, NY
Posts: 9,519
Default

crawl space vapor barrier help


Six mil is the standard in vapor barrier thickness.
__________________
Ron
"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety."
B. Franklin 1759
Ron6519 is offline   Reply With Quote
Old 07-04-2011, 02:30 AM   #7
Member
 
Join Date: Dec 2008
Location: Fairbanks, AK
Posts: 1,847
Default

crawl space vapor barrier help


I'd only spend the money on 10 mil if you were planning on using the crawl space frequently. Be sure to run it up the walls, secure it, and caulk it w/ a compatible caulk, something like Tremco acoustical caulk.
jklingel is offline   Reply With Quote
Old 07-04-2011, 08:36 PM   #8
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Default

crawl space vapor barrier help


As we don't know your location, only run the plastic up the concrete walls 6", to inspect for termites.http://www.termiteinstitute.com/cont...-hot-zones.asp
You may need to take special precautions if in a radon zone: http://energy.cr.usgs.gov/radon/rnus.html

Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
Old 07-04-2011, 11:06 PM   #9
Member
 
Join Date: Jan 2010
Location: AL
Posts: 146
Default

crawl space vapor barrier help


Clean it out for sure. You are breathing air that comes from your crawl space.

Gary has a good point about radon. If you have to mitigate for that, the quality of the plastic and the way it is installed will be more important.

John_W is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Bad smell in crawl space. John_W General DIY Discussions 34 06-03-2014 12:57 PM
Crawl space moisture/water removal KAdams4458 Building & Construction 7 04-24-2011 12:21 PM
Old Septic pipe flooding into crawl space ktipton Plumbing 2 04-14-2011 02:18 PM
Open crawl space to heated basement benjamincall HVAC 1 03-04-2011 07:52 PM
Crawl Space In Basement -- Please Help thekid Building & Construction 7 01-04-2008 08:15 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.