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Waterproofing basement


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By Joe in Hermiston, OR on 4/13/2010


Folks, I'm probably missing something easy, but I still need some help to figure this out. My house will be built on a hillside and I would like to put half a basement under the downslope half of the main floor. The question I have is: how do I waterproof the side of the basement under the main slab (see diagram)? I thought that you would pour the two slabs and the back wall of the basement in one monolithic pour. I thought that slabs were to be poured on undisturbed ground, so how do I get in there to waterproof the back of the basement? Any help would be greatly appreciated. Thanks.
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By Joe in Hermiston, OR on 4/13/2010


Here's the diagram.
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By Kenneth in Lees Summit, MO on 4/13/2010


What is your source of water you are seeking to waterproof against? How much water do you expect on the interior of the slab from the main floor?

Around here, footing tile drains are typically installed only on the exterior side of the footings; there simply isn't water under the interior slab. I did have one area where there was no standing water, but it was always wet. I did install a drain on the interior portion of that footing and tied it to the exterior footing tile drains, but this was an exception. Now then, there might be what look like drains installed on the interior, but these are vapor collection systems for venting radon gas.

I like to pour slabs over crushed stone base. Footers get poured on undisturbed ground. I have seen monolithic pours of slab and footer all at once, I do not recall how the base was prepared. I might ask how you intend to form that back wall, as you certainly can't get behind there to strip the forms. I don't guess the concrete guys relish using their nice seasoned forms in this installation, and I wouldn't want to leave wood forms in the ground as this invites termites (in my locale).


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By Joe in Hermiston, OR on 4/15/2010


Kenneth,

Thanks for your reply. I obviously didn't put enough information in my initial request. I plan on using ICF to form the wall portion. The water I'm protecting from is just general water from the ground. Not a specific source, just normal moisture moving through the ground. I just want to protect the ICF form against ground/moisture contact while being able to pour the two slabs and the wall in a single pour. Working on the theory of "an ounce of prevention is worth a pound of cure".

Thanks for your help. Joe


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