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drainage board under bldg

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Title: drainage board under bldg
I've got a three story building over a basement, the Architect wants to install a waterproofing system
under the entire basement which is a good thing in itself, but he also wants to add a drain board
( the kind that looks like an egg crate ) under the w.p . The drain spec sheet says it is capable
of withstanding twenty one kips per square foot in compression, and assuming no lateral / friction issues
at the bottom of the foundation, does any body see a problem with this application

Thanx in advance

Tarek Mokhtar, SE