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    Re: Crawl space foundation

    2 posts, 0 answered
    1. Debra avatar

      We are building a new home on a crawl space, using poured concrete for the foundation. I would like to use Xypex admixture in the concrete, and related Xypex products to seal tie-holes, etc. We plan to backfill around the foundation with free-draining gravel, after installing a good drainage pipe along the footing (sloping out to daylight). We have 2-foot wide overhangs all around the building, with the ground sloping away from the foundation on all sides.

      Local contractors aren't familiar with Xypex, and they believe that we should still install an exterior barrier to properly waterproof our foundation. I tend to think that's not necessary, in addition to Xypex and everything else we're doing to control water intrusion at our foundation.

      Does Xypex recommend using additional waterproofing methods for residential house foundations?
      Posted on 18 Oct 2017
    2. Jim Caruth avatar

      Jim Caruth

      Xypex has been used in many multi-level below grade structures where it has been the sole waterproofing.
      Clearly using a membrane in conjunction with Xypex is better than Xypex alone just like using Xypex in conjunction with a membrane is better than using a membrane alone…….nothing on the planet is perfect and a belt and suspenders approach is always better but to answer your question – yes, Xypex is used as stand-alone waterproofing even in situation of extreme hydrostatic pressure.

      My only concern is the shrinking and swelling of the soil – if the shrinking and swelling is such that it causes the foundation to flex, then you may end up with some cracks that will not heal with Xypex and need to be injected but we have a very good track record in regards to healing cracks and waterproofing of below grade concrete.

      Maybe show the video from this drop box link to your contractor.

       I trust that this is helpful.

      Posted on 20 Oct 2017

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