I have a very thin hairline crack in my conrete slab, right in the middle
of the garage doorway. It is barely visible and is so thin I can't even
feel it with my fingers. Unfortunately, water still finds it's way into the
crack on the outside of the garage door and seeps along the crack to the
inside of the garage. So, I would like to seal up the crack before it turns
into a bigger issue.
Most crack sealers seem to be made for larger cracks, so I'm not sure they
would even get down into my hairline crack.
On Thursday, March 17, 2016 at 10:23:48 AM UTC-4, HerHusband wrote:
If it's really that thin I'd try filler superglue from the hobby store. There is gray caulk for concrete if you think it's a little bit more open and you can use a plastic squeegee to force it in the crack and bit like grouting tile.
Is water getting *into* the crack or simply clinging to it as a "guide"
to flow into the garage?
I.e., are you sure the crack is the cause and not just a *symptom*
(of a low spot in the floor)?
As a first attempt, I'd try some silicone caulk applied with a trowel
(or float). This will tell you if the crack *is* the "low spot"
vs. just RESIDING in a low spot.
Once you know what the case is, you can peel the silicone off (or, scrub it
off with a wire brush) -- it won't last applied as thinly as your description
suggests it would be.
But, based on what this discloses, you might then be able to try an
epoxy intended for use with concrete/cement applied using the same sort of
technique. Make a serious effort to clean up the crack and surrounding
areas before trying to apply it.
Just get some sodium silicate - aka "waterglass". It is sold as a
concrete sealer, among other things - and will seep into the crack and
seal it up. (or you can make it from drain cleaner and silica-gel
dessicant packs if you want to get adventuresome)
On Thu, 17 Mar 2016 14:20:36 -0000 (UTC), HerHusband
How much of he crack is outside the door?
You might just drill a hole in it, right inside the door, using a
concrete bit. Then fill that hole with some sort of epoxy or JB Weld.
That will stop th flow of water to the inside!
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