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  1. #1
    Join Date
    Jan 2009
    Posts
    2

    Default Visqueen in crawl space replacement

    I have a ranch house in lower michigan (A2) thats on a crawl space and it has 4 outside vents in it. the visqueen that was put down in 1976 is all ripped up and i would like to just put new over the top of the current stuff or do i nee to remove whats already down before i can put new down?
    the exterior walls have a little foam on them but nothing on the floor (insulation).
    In the summer its very damp in the crawl space.

  2. #2
    Join Date
    May 2008
    Location
    Seymour - CT
    Posts
    60

    Default Re: Visqueen in crawl space replacement

    Hello wdave

    Since you will have to replace the visqueen, I'd strongly suggest that you take the extra step to fully protect your crawl space from moisture problem, and fully encapsulate and condition it.
    It is highly recommendable in regions where the summer is humid.

    Encapsulating a crawl space mean sealing all the vents, and lining the whole space with a sturdy 20mil poly vapor barrier, completely isolating the crawl space from the ground and the outside air, sealing all the seams.

    Then, add a drain or a sump pump and a conditioning system or a crawl space dehumidifier.

    This procedure will protect your floor joists, all the wooden structures, the insulation and keep the crawl space clean, dry and mold free, suitable to be used for storage if you wish.

    In addition, the savings in utility bills alone since dry air costs much less to cool and heat, will pay for the encapsulation over time.

    Be careful and consult a professional crawl space repair company if you have combustion appliances running in the crawl space. You do not want to create hazardous conditions by depressurizing the crawl space with such utilities in.

    Here's a couple of websites with a lot of info on conditioned crawl spaces and its benefits, based on studies conducted by Advanced Energy and Habitat for Humanity.

    http://www.crawlspaces.org

    http://www.dirt-crawl-spaces.com

  3. #3

    Default Re: Visqueen in crawl space replacement

    I agree with CyFree. I actually wrote an article on crawl space science that discusses issues with traditional systems versus closed, conditioned systems. There are a lot of advantages to closing and conditioning your crawl space, if it is done correctly. If something is utilized the wrong way, if an element of care isn't given to a control mechanism, or if something isn't installed adequately, any remedial activity performed in your crawl space may be in vain. It is best to seek professional assistance. Always look for a spe******t with the proper insurance; one that can explain the details of their system in a way you can understand; one with a warranty; third-party accreditation/certification is preferred; and someone whose system addresses all elements of thermal, humidity, conditioning and moisture control.
    Jason Yost, CIEC, CMRS, WRT
    Council-certified Indoor Environmental Consultant
    Council-certified Microbial Remediation Supervisor
    Water-damage Restoration Technician

  4. #4

    Default Re: Visqueen in crawl space replacement

    I guess I could have shared where my article is for anyone interested in reading it: http://www.solutionsiec.com/crawl_space_science.html

    Best wishes to all.
    Jason Yost, CIEC, CMRS, WRT
    Council-certified Indoor Environmental Consultant
    Council-certified Microbial Remediation Supervisor
    Water-damage Restoration Technician

  5. #5
    Join Date
    Jan 2009
    Posts
    2

    Default Re: Visqueen in crawl space replacement

    Thanks for the help, but still dont know if i can just put down new over the existing or not.
    Doesnt sound like it would be as good as pulling up the old and laying new.

  6. #6
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Visqueen in crawl space replacement

    Personally I don't see a problem with applying the new layer over top of the old making sure to get as continious a coverage as possible.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  7. #7
    Join Date
    Jan 2008
    Posts
    731

    Default Re: Visqueen in crawl space replacement

    If you're not going to remediate the dampness problem then no. You don't just put down another layer of plastic, you'll just create a mold slime pool liner.

    There have been several good posts already on suggested measures to remediate your damp crawlspace.

    There is no JUST about it.

    good resource: buildingscience.com

  8. #8
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Visqueen in crawl space replacement

    Quote Originally Posted by wdave View Post
    I have a ranch house in lower michigan (A2) thats on a crawl space and it has 4 outside vents in it. the visqueen that was put down in 1976 is all ripped up and i would like to just put new over the top of the current stuff or do i nee to remove whats already down before i can put new down?
    the exterior walls have a little foam on them but nothing on the floor (insulation).
    In the summer its very damp in the crawl space.
    If this dampness is due to the existing visqueen being all ripped up .... then it shouldn't be an issue to cover over it.
    If the dampness is from water entering from outside then you should resolve that issue before recovering the ground in the crawl space.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  9. #9
    Join Date
    Nov 2008
    Posts
    1

    Default Re: Visqueen in crawl space replacement

    well have you even try to search in some ****** services like crawl space replacement or home improvement,,




    _____________________
    Crawl Space Dehumidifier

  10. #10
    Join Date
    Mar 2009
    Posts
    1,387

    Default Re: Visqueen in crawl space replacement

    Howdy, adding another layer to the palstic would be an ok option. I would overlap any seams at least 5" and use a 50 year silicone/ latex caulk to seal the seams. Id allow 1' extra plastic up at walls and pour a continous 3" pile of sand on the new visquesn by the wall to retard moisture transfer. Is your crawlspce cross vented? How wet is it. Have you made sure that any rain gutter down spouts do not drain right next to the foundation, ( they soud extend at least 8' from, the foundation) an make sure any sprinkliers only spray way not onto the foundation? Don't plant plants that need watering next to the house.

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