I'm looking for advice on using dimpled membrane products (e.g.
Superseal, Delta-MS, etc.) for waterproofing a block basement wall
(this is new construction). My foundation contractor thinks it sounds
like a good idea, but he insists that I should use it in conjunction
with asphalt/6-mil poly applied to the wall so that any water which
does manage to get in around the dimpled membrane still won't
penetrate the wall. Intuitively, I agree with him that "more is
better" when it comes to waterproofing, but I also know that any water
that does get into the wall (and inevitably it will) needs a way to
escape. If I apply a waterproofing barrier directly to the outside of
the wall, that leaves only the inside of the wall for moisture to
escape, which, in turn, limits what I can do in the future in terms of
insulation/vapor barrier installation. Obviously there are ways to
accomodate "breathability" of the interior of the foundation wall, but
it seems to me that a breathable exterior is one of the great
advantages of using a dimpled membrane.
Does anybody here have any direct experience with these products? Are
they good enough that I can forego additional waterproofing? For what
it's worth, none of the manufacturers' sites recommend anything
additional under the dimpled membrane. Then again, they also don't
specifically recommend against it.