Question for Worthy.

cheri127May 19, 2012

Hi Worthy. I have read and re-read Lstiburek's crawl space paper and I think I finally get it. Could you tell me if this is right? One can completely cover the wood joists with spray foam as long as one uses 3" high density foam? The reason the open pier approach works is because the crawl space isn't colder than the outside air?

If all this is true, would I be able to correct my flawed crawl space by

1) covering the floor with a 20 mil vapor barrier

2) remove batting then spray the wood with 3" of high denisty foam

3) continue to use SaniDry dehumidifier

I can't do the open pier approach because most of the crawl space is below grade.

I have read many of your posts recently they are so informative. Thanks for taking the time to share so much information.

Thank you for reporting this comment. Undo
worthy

You overlooked two steps:

1) a drying mechanism--such as a supply of conditioned air from the interior and exhaust (See link--Figures 2, 3, 4)

2) insulation on the perimeter walls--spf or extruded polystyrene board (XPS)

The 20 mil barrier is overkill if you're not using the crawlspace.

Here is a link that might be useful: Conditioned Crawlspace Construction

    Bookmark   May 30, 2012 at 6:20PM
Thank you for reporting this comment. Undo
worthy

If you're insulating the perimeter, forget insulating the ceiling.

    Bookmark   May 31, 2012 at 8:18PM
Sign Up to comment
More Discussions
Ductwork through joist question
Hi, I know this is possibly controversial...I understand...
NYcRavi
Which drywall to use in the basement?
Hi, I am finishing a basement that is under the attached...
Vesh
Flooring System over a basement
In my current house we used 16-18" deep floor...
AZN8TIV
making the crawl space more useful?
My house has a (vented) crawl space between 2 and 3'...
gigelus2k13
How to re-do the stairs for my basement remodel
So I'm undergoing a simple remodel of a small basement....
phiwwy
Sponsored Products
Nelson | Apple Lamp
$329.00 | YLighting
NM Creme Brulee Almonds
$35.00 | Horchow
Feeling Stumped Lamp
$77.99 | Dot & Bo
Bath Authority DreamLine Duet Sliding Shower Door (56"-60")
Modern Bathroom
Frasier Leather Sleeper Sofa - Brighton Black Black
Joybird Furniture
Pittsburgh Pirates Garden Flag
$8.99 | zulily
Afina Vanderbilt Medium Triple Door Surface Mount Baroque Medicine Cabinet - 42W
Hayneedle
Americh Bel Air 6042-17 Tub ADA (60" x 42" x 18")
Modern Bathroom
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™