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    Winkmeister's Avatar
    Winkmeister Posts: 1, Reputation: 1
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    #1

    Jul 27, 2014, 05:46 AM
    Waterproofing cut out in basement floor slab before repouring
    We have broken out basement floor slab to install a drain for a new shower. Trench is approx 6 feet long by about 6 inches wide (irregular not saw cut). I know that a vapour barrier has to be reinstalled but I'm not comfortable installing 6 mil poly due to the difficulty installing in a narrow irregular cut trench.

    What I'm looking for is a liquid or spray applied waterproofing product to apply on top of the gravel in the trench to form an effective vapour barrier. Any ideas?
    smearcase's Avatar
    smearcase Posts: 2,392, Reputation: 316
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    #2

    Jul 28, 2014, 02:56 AM
    These folks may have an opinion on use of their product or another suggestion:
    SPRAY-ON VAPOUR BARRIER FOR CONCRETE

    I don't follow why it is so difficult to place the 6 mil poly. Possibly use a width of poly that is as wide as the widest opening and trim it in the bottom of the opening with a good razor knife? Spray some foam insulation at the joint between old and new poly for total seal if you think it is necessary.

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