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Old 06-24-2011, 01:23 PM   #1
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tar coat depth for crawl/basement


about to embark on a french drain installation on one side of my house, and in doing so, since I'll be digging up next to the foundation anyways i feel it would be worthwhile to apply a tar-coat + paper to the outside as an additional protective measure.
problem is i'm not sure how deep to go as I have half crawl space and half basement (~6').

should i simply dig as deep as the crawspace along the entire length?
if i did this it would obviously be easier, but i would only be tar-coating about half the depth of one portion of the house.
is this acceptable?

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Old 06-24-2011, 01:52 PM   #2
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tar coat depth for crawl/basement


If you're going to that much effort, don't use 1950 technology. There are products available that are far superior to "Eisenhower" tar.

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Old 06-24-2011, 01:53 PM   #3
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tar coat depth for crawl/basement


ahh hehe what would you recommend?
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Old 06-24-2011, 02:07 PM   #4
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tar coat depth for crawl/basement


we use sonneborn's ' sonolastic ' but you can also use regular roofing cement,,, the protection course is VERY important - miradrain is our choice but sonneborn also has dimpleboard - just a different color,,, i would encourage you to install a proper toe drain alongside the foundation incl soil filter cloth & gravity drainage,,, failure to allow system drainabe will convert all your hard work into a drywell allowing subsequent repeat wtr infiltration
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