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Community and Q&A

How do I seal the slab edge in my basement around Stego Wrap and foam?

ERIC WHETZEL | Posted in Green Building Techniques on

My basement slab has been poured, and I’m ready to cut back the Stego Wrap and 1/2″ foam at the perimeter of the slab.

Is there a durable, low VOC sealant that would be ideal for filling the gap between the Stego Wrap and basement wall?

After this edge is sealed, is there a good way to dress this area up? Is there a specific kind of moulding that would nicely cover this slab/wall connection without taking up too much space? The only finish on the concrete walls will be primer and paint, no drywall, and for the floor probably only a sealer.

Thanks in advance for any ideas or suggestions!

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  1. verygood | | #1

    We have dealt with this detail in the past with Prosoco Air Dam; Not sure if it's paintable...

  2. GBA Editor
    Martin Holladay | | #2

    If you did an excellent job of water management, the molding doesn't need to be pressure-treated. Just pick out a molding profile that you like, and embed it in the caulk. Most types of caulks, including silicone, act as an adhesive as well as a caulk.

    By the way, unless you live in a very warm climate, your basement walls need to be insulated. I'm guessing that you installed exterior insulation -- right?

  3. Stockwell | | #3

    I have seen Eric's blog--he has thick Roxul insulation on the outside of his basement walls.

  4. ERIC WHETZEL | | #4

    I like the idea of using Air Dam in combination with a small piece of moulding with a simple profile.

    We have 5" of Roxul on the exterior side of the foundation, and 4" under the slab.

    Thank you for the responses!

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