When we get really heavy rain the water comes up along the basement
foundation to a point where it can enter my basement through the hole
in the foundation where the water service enters the house.
The service entry works like this: The builder layed a 3 inc pvc in
the concrete and then stuck the 1 inch copper water service pipe
through it. Nothing was used to fill the void in between the PVC and
the copper pipes.
I have swales, clean gutters, etc., etc.
What's the best way to seal up this waterway?
Dig it up on the outside. Clean the wall. Clean the sleeve (the
big pipe in the concrete). Clean the water pipe.
Use backer rod of the proper diameter (sounds like 1") to fill the
void around the water pipe. Recess the backer rod about a 1/2".
Caulk with polyurethane caulk. (NP1 would be my choice) or good
silicone (Dow 795).
For additional insurance you can treat the penetration and
surrounding concrete with plastic roof cement, rag, and more roof
Cover the new work with a piece of beaver board, pearl board,
rigid Styrofoam, or other to protect the caulk/tar when you
Keep the whole world singing . . . .
DanG (remove the sevens)
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