I have a crack in my poured concrete foundation that I want to fix. I
searched the net but many of the suggestions were for an interior repair.
The basement is finished at that point and I don't want to tear everything
oug. I went to my local builders' supply to see if they had any advice.
They suggested I go to HD. The guy there suggested I chisel out the crack,
parge with hydrostatic cement and apply a blue coating (I forget the name).
Nothing was said about a membrane. Any suggestions?
Cracks are usually unstable. You can fix it and see what happens.
You will not find anyhting that you can use to "hold" the concrete
together if it is still moving around. You're better off ignoring it
and using a flooring solution that floats. Carpet, wood, or
laminate. No tile.
Here's a recent thread.
The glass idea is a good one, unless you've been there 10 years and
know the crack has been stable. What is required, eg membrane?,
depends on info we don't know. If your basement is dry and there
has been no water infiltration from the crack for at least a few
then I'd say skip it. For obvious reasons. To seal from the outside
is going to require excavation down to the footers.
Cracks in foundations are not that uncommon actually -- is it right
underneath the metal I-beam? It often happens when the builder is in
a rush, and doesn't let the concrete set properly. There's several
products for repairing cracks, but I've done some research of my own,
and basically, you need an injection system to do it right (if you
don't want it to come back). Injection kits are not always available
at your local hardware stores either -- home depot sells many products
for repairing foundation cracks, but none of them were injection kits,
and so I steered clear!. You can order some on-line or shop around.
I believe I found my kit hidden away on the bottom shelf at a Rona,
for about $150. I fixed my crack in two sessions of less than an hour
each. After three years, there wasn't a single drip, even after heavy
rains. I've since dry-walled over.
I'd get some old plastic bags like you use to carry home groceries,...
and a screw driver and a hammer and stuff that crack full of strips from
the grocery bags. Then think about it for a couple of years to see if
it still needs a permanent fix. Maybe we will have a new president by
the time it needs fixing.
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