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Dimple membrane and extruded polystyrene

Brent_F | Posted in General Questions on

I’m in the process of insulating my basement on the path to finishing it for more livable space.  I have an interior basement drain that leads to a sump pit, and with having the drain I have about a 1/2 gap between my basement floor and the foundation wall.  Due to this gap I’m installing Superseal Dimple Membrane ( on the walls to divert any moisture that may come through the wall directly into the drain.  I have installed the dimple membrane using Hammer Drive Pin Anchors ( ).  My main question is: Can I use a PL Foamboard adhesive to attach the 2″ Extruded Polystyrene to the Dimple Membrane or what would be the best practice for that assembly?  Thanks


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  1. GBA Editor
    Martin Holladay | | #1

    If I were you, I would use mechanical fasteners with large insulation washers. For more information, see this article: "Fasteners for Concrete and Brick."

  2. Expert Member
    BILL WICHERS | | #2

    You could try the adhesive, but be warned that many/most adhesives won't adhere to polyethylene at all. You'll be better off using mechanical fasteners as Martin suggested. I like the Hilti PMF system which is made for this purpose. It's fast, easy, and not too expensive.


  3. gusfhb | | #3

    I have found most polyurethane constuction adhesives do not eat foam, and grab better than the blue foam adhesive

    Ditto on the nothing sticks to polyethylene tho...

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