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Unread 01-18-2010, 09:45 AM   #1
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Basement Waterproofing - A tile setters approach

With my extra Kerdi and some Grani Rapid (White & Grey) I set some Kerdi Band (10 1/2") strips on my inside corners yesterday before we installed the bottom plates.

I had enough old stock to prep my future office.

I want to waterproof my whole basement - right up to 6-8" below the top of the foundation walls.

I used Kerdi on top of my concrete then a roll of sill gasket as required by code. I'm sure the Kerdi would have passed but that would have required some extra explanation.

Over kill I'm sure but there are signs of moisture in my home and I don't ever want to have moisture issues going forward.

Laticrete has some high tech water proofing that can handle water pressure I think. I'll contact Henry and find out what my options are.

Stand by for BC's largest shower pan....

Last edited by johnfrwhipple; 02-19-2010 at 09:00 PM.
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Unread 01-18-2010, 05:20 PM   #2
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I don't think waterproofing from the other side like you are doing will do much good,
but what do I know.
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Unread 01-18-2010, 05:49 PM   #3
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Why not that spray foam insulation like on that Holmes show? I really like that stuff. I use it as much as possible.

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Unread 01-18-2010, 06:19 PM   #4
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Were is the moisture coming from that you are trying to keep out? From the walls or the floor slab? Are you going to use Ditra on the floor? Assuming you are, and you can get a good seal between the Ditra and the couple inches of Kerdi protuding, what you show may work OK to keep water vapor under the floor from coming up through the floor slab. The connection between the Ditra and Kerdi is only waterproof when the kerid is stuck to the top side of the Ditra, so it will be kind of an intersting wrinkle tucking the Ditra under the Kerdi.
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Unread 01-18-2010, 06:34 PM   #5
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You want to make sure you have a good grade sloping away from the house too.
mm (aka "Paco")
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Unread 01-18-2010, 06:41 PM   #6
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What good will the Kerdi do if you don't have the whole wall waterproofed?
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Unread 01-18-2010, 08:05 PM   #7
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Really, you are wasting time and money like that. Waterproofing on the basement wall needs to be done outside the house with tar and a proper foundation drain. the only way it can be done inside is by cutting a channel around the perimeter in the concrete and installing a drain that goes to a sump well.
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Unread 01-18-2010, 08:46 PM   #8
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I agree with Jason and others,there is a proper way to waterproof it and anything else is just wishing on a star.Where's my wishing on a star smiley?

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Unread 01-18-2010, 10:21 PM   #9
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Best way to waterproof fdns, imho, is use rubber glued to concrete, then battle drain to protect rubber & direct water to perimeter drainage system below grade. All finish grade needs to slope away from home farther & steeper than is typically done. All beds / landscaping adjacent to house should not trap water against fdn. All water from roof/impervious decks needs to be directed away from fdn as well, either thru gutters & downspouts into separate tite-line system (best) or splash blox (minimum). Not doing just one of these things could negate the others. Oh yea, all this is done on the outside of the fdn.

and then there's underground springs..... that looks like a fun 'exercise' tho.

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Unread 01-18-2010, 11:53 PM   #10
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My Vancouver Basement - waterproofing thought process

I have lived in this home for 7 years. We have never had any water issues but there are signs of water on the old foundation walls. We busted out the old cast iron waste lines and dug out the perimeter of the home to replace drain tile, water proof foundation, poor under pinnings and add new foundation.

The old foundation walls where 8" non reinforced concrete will no footings. The old drain tile 4" clay octagon. We added new foundation and underpinned the rest. 3 coats of tar, Delta Drain Cladding and 3/4" ridgid foam insulation to the exterior concrete walls. Perimeter drainage is 4" perf pipe with 1 1/4" drain rock.

I noticed on the east elevation what looked like water veins in the dense sand when we adding the underpinning. The streaking reminds me of beach sand the way the ground water heads for the sea. With only 2" of basement slab and no poly or foam underneath I believe my basement when heated is wicking moisture through the floor and under my basement subfloor.

If I where to pour a new slab today I would need insulation and poly under it. With my old kerdi scrapes I covered the bottom plates and inside corners. The plan is to use a liquid membrane to coat the floor and walls. I built the new walls 1/2" off of the concrete foundation and plan to shoot the walls with an inch of spray foam once I have seen them settle in nicely with their new load.

For the floors I'm toying with the idea of setting 2'x2' Dry Core sub floor panels with a little space age mortar and getting a rock solid waterproof basement floor.

At the very least all these filled nooks and crannies should at least cut down on the monster sized spiders we grow here in the North Shore!
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Unread 02-14-2010, 11:06 PM   #11
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Unread 02-15-2010, 03:14 PM   #12
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Seems to be a little creative thinking going on here.

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Unread 02-15-2010, 04:24 PM   #13
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Meeting with Laticrete

I meet my rep for Vancouver on site and tried to find which product might work for my plan.

I'll work on a drawing for this thread so everyone can get inside my head.

We won't be closing up my basement walls until I know the house as settled in nicely. The Kerdi I though was good for the bottom plates as it does not pass water in either direction.

As I was informed many of the liquid waterproofing membranes are designed to allow trapped moisture to get out but keep back the reverse.

Stay tuned...
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Unread 02-15-2010, 04:36 PM   #14
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Here is how we did waterproofing on the interior side of a basement. Of course this was a complete gut and old slab floor and fill were removed. However you could accomplish similiar by trenching perimeter of basement.

The black fabric is called Enkadrain, it's a woven fabric that goes up against foundation wall. Any water that comes in is channeled into trench. A 4" perforated pipe is laid in tranch and is pitched into sump box. If water gets to high a pump can be added into sump.

Hope the photo comes out okay.
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Unread 02-15-2010, 04:40 PM   #15
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Another photo of pipe entering sump.
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