Foundation Patch

Captainsls

We will be installing a retaining wall for a customer in a few weeks. Next to the proposed wall area I have discovered a leak where the concrete form for the garage meets the house. The garage was an addition that looks rather poorly built. The garage sits sub-grade at basement level.
After looking at the inside wall of the garage where they meet, it looks like the problem is occurring where the form meets the original foundation. Could someone tell me what the proper way would have been to join the two structures when they were built?
It looks like they didn’t even attempt to join them in any fashion; they just set up forms and poured.

My solution (after I excavate on the outside of the foundation) is to chip, or grind away much of the ruff concrete at the seam, tuck the seam with a modified type S, and paint over the afflicted area with a foundation water-proofer. I also intend to backfill using an open graded aggregate to promote percolation in this area.

Sound like a reasonable solution?

CJKarl

Yes, maybe even waterplug cement. (hydrolic cement)

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mdshunk

They seal those Superior Wall panels together with a Tremco sealant product. I'm not sure which one.

Tscarborough

Either a keyway and/or a waterstop should be used for PIP cold joints.

This link has the information on waterstops (new and retrofit):

http://www.greenstreak.com/submittal_select_items.asp

Show us a picture for possible remedies in your situation.

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Captainsls

Thanks for the great feedback.

Tscar, the rubber diaphragms would have been the logical choice, but I don’t think anything like that was used.
By keyway, do you mean notch the old foundation and pour? Or would some type of expanding key be driven into the keyway at the joint?

Also, Greenstreak makes a product called "Leakmaster". Sounds like hydraulic cement that has the ability to expand? Any good?

(I will be sure to get some picts, thanks)