tar coat depth for crawl/basement

eddytheflow

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?

Ron6519

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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Ron
"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety."
B. Franklin 1759

eddytheflow

ahh hehe what would you recommend?

itsreallyconc

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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if you hear it from a guy in the apron store, be VERY suspicious the mtl/method will work,,, when it time to build something together, they won't answer phones NOR help
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