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Posted by Edwin Pawlowski on March 14, 2007, 10:28 pm
> Mix equal parts of portland and sand, add only enough water to hint at
> changing the color. This mixture needs to be extremely dry. It should
> barely form a "snowball" when you squeeze it in your hand. Pack a heavy
> layer into the hole. Use a hammer and stick like a 1x2 about 10" long and
> begin to drive the drypack into the hole. Once that layer is well driven
> in, add some more and repeat until the hole is filled. Once full, apply a
> heavy layer of plastic roof cement or equal to the outside concrete larger
> than the hole you have filled. Reinforce the roof cement with mesh,
> protect with a bit of tar paper, beaver board, or equal and backfill.
> This can be done as soon as you have filled the hole. You should be able
> to pull the interior form immediately, but prudence might leave it on for
> a day or two.
Before doing this, I'd wrap the pipe with foam pipe insulation. It allows a
bit for expansion and vibration that can cause a problem five or ten years
from now.
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