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Community and Q&A

Basement wall finish

user-6957254 | Posted in General Questions on

Does anyone have a great drawing or diagram showing how to finish a basement wall?
We have some basement walls that are completely concrete, but also some that are above grade, which already have been insulated with spray foam.

We are starting to order supplies to finish a few rooms in the basement, and I want to make sure I get the details right.

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  1. GBA Editor
    Martin Holladay | | #1

    If you are going to spend thousands of dollars to finish your basement, I urge you to spend $15 for a one-month membership to GBA Prime.

    Then you will have access to all of the details in the GBA detail library. I'll attach one image below to whet your appetite. There are lots more details where this one came from.

  2. user-6957254 | | #2

    Thank you. I have thought about this, and I believe at one time I had a membership. I think it may be time to renew.

  3. user-6957254 | | #3

    Martin, on the interior wall partitions, do you need a sill sealer between the concrete and the treated wood?

    1. Expert Member
      Dana Dorsett | | #5

      For any non-structural studwalls resting on an uninsulated slab (including the one trapping the foam to the foundation) 1" of EPS is better capillary & thermal break than a sill gasket, and would allow the use of UNtreated lumber.

      Code-min performance for zones 5 & up is R15 continuous insulation, but the same thermal performance can be achieved with less foam if using fiber insulation in the studwall. There still needs to be sufficient foam-R for dew point control on the fiber for above grade portions of the wall, and for basement walls that are mostly above-grade it needs to have total performance equal to the current code minimum. In zone 5 an R13 + R5 foam wall works for the mostly below grade wals, but R13+ R10 would be required for walls mostly above grade (for total thermal performance, not dew point reasons.)

      Where are you located?

  4. user-6957254 | | #4

    I think I am having a tough time differentiating some articles that mention a construction adhesive. If we plan to anchor the floor, would the construction adhesive be needed?

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