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Question DetailsAsked on 9/3/2015

How to fill large gap in foundation from drain pipe?

At the top of my basement foundation I have drain piped coming down from my kitchen sink. There is a large gap in the concrete wall where the pipes run, So much so I can see sunlight coming thru, I suspect there is only siding and a small amount of insulation separating them from the outside. The drain pipes consistently freeze in the winter when its gets into the teens. Looking for best way to fill it up? Insulation and great stuff? Also what kind of contractor would I look into if I didn't want to do it myself.

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1 Answer


IF a "large" gap - say a foot or so, the pipe should be wrapped in fiberglass insulation or foam pipe wrap (to give it some play) then the hole filled in with patching grout - or concrete if very large. IF by "large" you mean just an inch or few, then I would use Great Stuff or similar. On the outside, to prevent rodent entry (they will dig through foam or fiberglass readily) embed steel wool so it cannot be pulled out by a critter, or put a piece of steel mesh - can just shove into the foam if you have it precut and ready to go when foaming. Of course, avoid getting out of hand with the foam so you don't get it all over the siding - might want to skirt the outside of the hole first with waxed paper or flattened out plastic garbage bag or such as a protector first.

In termite or carpenter ant country definitely use window screening size mesh to prevent them - subterranean termites will tunnel through it no problem, and carpenter ants like to build their nests in foam.

Answered 5 years ago by LCD

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