How to Insulate Crawl Space Wall That is Stone or Brick

Image of Spray Foam Wall Insulation_Crawl Space

I recently received a question via our YouTube Channel from Neil in New Hampshire:

"hi Mike, your videos have been very informative thank you. (thank you Neil 🙂 ) I'm about to encapsulate my crawl space and could use some advice. I live in New Hampshire where it is extremely humid in the summer and quite snowy and cold in the winter. My crawl space is stacked stone and very uneven. I was wondering if you recommend froth Pack or any other two part closed cell spray on the stone or just use the foam board against it?"

Neil, we have issues like this as well. Many times homes we face are brick foundation walls built in the early to late 1900s and applying a foam board to uneven walls is very difficult. But, there is another problem.

Stack stone and brick is difficult to drill into and place a Christmas tree fastener or to shoot a Hilti nail could damage the mortar or brick.

As you can see from this picture, we applied a two component spray foam in order to air seal the foundation wall as well as give the wall a thermal barrier in our encapsulated crawl space.

I'd love to see some photos of when your done with your project. You can put them on our FB page if you like

Good luck and thanks for the question.


  • What else do you feel would be helpful for us to know?

Spray Foam Insulation on Brick Walls

About Michael Church

Michael Church has been involved with indoor air quality since 2005 and feels the unhealthy crawl space is one of the major problems causing poor indoor air quality.