Hello Pros.

I have been reading up on the use of closed-cell foam applied to brick (foundation) walls.

I live and do business in northern Virginia, where we have a heating dominated climate with hot and humid summers.

I had no concerns spraying foundation walls of basements and crawl spaces with closed-cell foam (typically 2") until I was asked about whether brick walls can actually be compromised by spraying them with closed-cell foam.

I understand building science, and therefore why I have become a huge proponent of closed-cell over open-cell foam.

So, if I spray 2" to the brick walls in a crawl space in Washington DC am I doing the right thing, or am I introducing a structural issue? I was going to spray the brick walls of a tight crawl space, as well as the rim\band joist areas, after laying down a 12 mil vapor barrier (sealing the seams and running the vapor barrier up the walls a few inches).

Thanks in advance.

Patrick

Views: 1378

Reply to This

Replies to This Discussion

Check out http://www.buildingscience.com/documents/insights/bsi-011-capillari... & they did have one other on spalling for spraying above grade walls. If worried maybe consider using Delta Dry on walls & then spraying???

6 to 8 inches as I recall is minimum not just a few inches

Thanks Sean.

Here in central Vermont, we see houses from the 1800s with brick walls as part of the foundation, but the brick is not structural. Large slabs of granite are holding up the typical 8x8 sill beam. If we were to spray SPF (Spray Polyurethane Foam) on the brick, we are usually not air sealing, due to the large cavity between the granite and brick. In the rare house where there is only brick (typically a double-wythe wall) supporting the sill beam, the brick is in poor condition from being subjected to high moisture from the basement or crawl space, as well as moisture from the exterior weather. In my opinion, if it is structural brick, and if it has been subjected to a chronically damp crawl space, then the brick is not drying to the interior anyway, so I would be less concerned about SPF on the interior IF the brick is in good condition. A minimum of 2" of closed cell SPF would meet the requirements for the DC area. Much more than that would be a waste, unless you are going to also insulate the floor of the crawl space. 

Thank you Brad, that is very helpful.

RSS

Featured Forum Discussions

Too many BTU's. Too much horsepower?

Started by Steve in General Forum. Last reply by Eric Kjelshus on Saturday. 4 Replies

Stack/wind pressure and flow networks.

Started by Daniel James Grundy in Training. Last reply by Daniel James Grundy on Thursday. 5 Replies

BDT with vermiculite in hollow CMU walls?

Started by Brad Cook in General Forum. Last reply by John Nicholas on Thursday. 2 Replies

Strange IR Image

Started by Larry Nissman in General Forum. Last reply by Brad Cook Mar 9. 7 Replies

Videos

  • Add Videos
  • View All

Latest Activity

Home Energy Magazine posted a blog post

The Elephant in the Room

Last week I attended the annual Home Performance Coalition (HPC) Conference & Trade Show in…See More
5 hours ago
Diane Chojnowski replied to Quinn Korzeniecki's discussion Don MacOdrum Receives BPI's 2017 Tony Woods Award and Four Others Inducted in to Hall of Fame in the group Building Performance Institute (BPI)
"Congratulations Mike! Thanks for all you do for the home performance industry!"
7 hours ago
Sarah OConnell's blog post was featured
8 hours ago
Mike Rogers replied to Quinn Korzeniecki's discussion Don MacOdrum Receives BPI's 2017 Tony Woods Award and Four Others Inducted in to Hall of Fame in the group Building Performance Institute (BPI)
"Congratulations to Don! A deep thanks for the honor--and even more thanks to the many who've…"
20 hours ago
Mike Rogers joined Building Performance Institute's group
Thumbnail

Building Performance Institute (BPI)

BPI is the nation's premier standards development, quality assurance and credentialing organization…See More
20 hours ago
Horace Douglas Hunt, Jr. replied to eric anderson's discussion Energy auditing equipment for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Have you sold this or still interested in sales of this equipment?"
22 hours ago
Charles Maier is now a member of Home Energy Pros
yesterday
Derrick Brodanex joined allen p tanner's group
Thumbnail

Energy Auditing Equipment for Sale, Trade or to Purchase

Discuss the pros and cons of the equipment you are interested in prior to purchase. Post equipment…See More
Sunday

Home Energy Pros

Welcome to Home Energy Pros – the unique digital community by and for those who work in the home energy performance arena.

Home Energy Pros was founded by the developers of Home Energy Saver Pro (supported by the U.S. Department of Energy) and brought to you in partnership with Home Energy magazine.  Home Energy Pros is sponsored by the Better Buildings Residential Network. Please honor our Guidelines

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service