GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Basement insulation

userfriendly | Posted in GBA Pro Help on

I have a full basement in zone 5A. The poured walls are the brick look style.
I plan to use board insulation first on the wall. Are all the cavities that make the brick look a problem as far as a moisture intrusion point?
Is there a way around this WITHOUT using a spray foam contractor?

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.


  1. GBA Editor
    Brian Pontolilo | | #1

    Hey Greg,

    I'm not sure what you mean by "the brick look style." Do you have any photos?

    1. userfriendly | | #2

      Not there to take photos. But the brick part sticks out past the morter part , the morter parts are recessed channels 3/8" deep. Looks like a brick wall. Never seen that before? Very common here.

      1. GBA Editor
        Brian Pontolilo | | #5


        I don't think I have. If you can add a photo when you have a chance, I'd appreciate it.

        If you are going to use rigid foam insulation, I think Matt and Jon are giving you good advice below, make sure you find a way to air seal the foam to the brick.

  2. MattJF | | #3

    Is the brick look on the inside? I’ve seen things like this on the outward face, but never the inner.

    I don’t think the surface should cause problems. Make sure you get a good air seal at the top and bottom.

  3. Jon_R | | #4

    +1 on just making sure that you prevent airflow behind it. Probably best done with thick soft foam gaskets.

    Use unfaced EPS foam for the insulation.

  4. the74impala | | #6

    Sounds like a cinder block wall.

  5. userfriendly | | #7

    Thanks for the input! Its a poured foundation, the pans they use have the brick look. Wish it was flat on the inside.
    What mastic should i use on the vertical seams of the board insulation? I appreciate all of the ideas on this thanks again GP.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |