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Whats the best method to waterproof a new foundation?

Jasonc083 | Posted in Energy Efficiency and Durability on

So far the footing is in. It sits on top of a foot of gravel that was compacted. There’s perforated pipe along the inside of footing that connects to a sump pump. The back fill will be sandy soil. I plan on using the asphalt for damp proofing and then platon membrane on top of that with 2″ of xps or 3″ of eps insulation on top of that. Does this sound decent? If I put the insulation to the top of the foundation what can I use to cover it so it won’t look ugly?

Also, I’ve read that I should use something on top of the footing as a capillary break between it and the foundation wall. What do you reccomend? Should I just damproof on top of the footing? Also should I damproof on top of the foundation wall?

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  1. GBA Editor
    Martin Holladay | | #1

    Jason,
    Q. " If I put the insulation to the top of the foundation what can I use to cover it so it won't look ugly?"

    A. If you are referring to exterior insulation, you will find the answer here: How to Insulate a Basement Wall.

    Q. "I've read that I should use something on top of the footing as a capillary break between it and the foundation wall. What do you recommend?"

    A. A variety of materials can be as capillary break in this location. According to Joseph Lstiburek, these materials include "dampproofing, low-permeability paint [e.g. UGL DryLock latex masonry paint], or elastomeric paint." Some builders have used 6-mil poly, although poly isn't easy to work with in this location. Then again, asphaltic dampproofing isn't easy to work with either.

    Another option is Delta Footing Barrier.

    Here's a link to a video:
    https://www.greenbuildingadvisor.com/blogs/dept/green-building-blog/video-passivhaus-foundation

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