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-   -   Bubble-Foil Insulation on Basement Walls? (http://www.diychatroom.com/f103/bubble-foil-insulation-basement-walls-114444/)

huesmann 08-18-2011 09:16 AM

Bubble-Foil Insulation on Basement Walls?
 
Is it kosher to use bubble-foil insulation on basement exterior walls? TIA.

AGWhitehouse 08-18-2011 01:28 PM

foil facings are usually considered class I vapor retarders and are not recommended in basement spaces at it traps moisture and enhances the chances for mold growth.

huesmann 08-18-2011 03:10 PM

How come the "typical" installation includes a vapor barrier sheeting under thhe drywall?

AGWhitehouse 08-18-2011 03:17 PM

Quote:

Originally Posted by huesmann (Post 710127)
How come the "typical" installation includes a vapor barrier sheeting under thhe drywall?

If you're looking at a book/website that calls for a vapor barrier on the interior side of the basement wall insulation assembly then throw it out.

http://www.buildingscience.com/docum...ion-assemblies

It's not recommended because of trapped moisture within the cavity space. Moisture comes for the exterior of a foundation and migrates towards the interior.

That "typical" installation is for above grade walls where moisture within the wall has the opportunity to dry to the exterior. Basements can't dry to the exterior.

huesmann 08-18-2011 03:49 PM

What is recommended for existing construction masonry walls to be finished with drywall, in the Mid-Atlantic?

AGWhitehouse 08-18-2011 04:06 PM

I'm assuming you are talking about a masonry foundation wall.

I would recommend following this section as closely as possible: http://www.buildingscience.com/docum...ion-assemblies

You can look other options and the results of the tested assemblied by clicking on the "High R-Value Foundation" on the left side of the page.

huesmann 08-18-2011 04:41 PM

Thanks, I appreciate it.

carlosc 11-23-2011 08:51 AM

There are some helpful answers to foil insulation located here:
http://www.farmtek.com/farm/supplies...RNAL_PAGE_3005


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