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Old 05-23-2017, 11:44 AM   #1
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Default Question for contractor or Concret mason.

If you have a 4 foot hairline fracture in the middle of a homes foundation would you have to bust the concrete up and repour a new slab in that section or would you just fill the crack?
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Old 05-23-2017, 12:59 PM   #2
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No, hopefully you wouldn't need to go to that extreme. I'd use self-leveling mortar and go over it, after cutting it (the crack) wider with a concrete saw, if it is indeed a "hairline" crack. Otherwise, just let the self-leveling fill it in, if it's wider than hairline. If you're planning on tiling, there's a membrane you can put over the crack to prevent the tile from cracking if the crack continues. We used to fill the crack as above, plus used the membrane over the patch work for ceramic tile. If we were laying snap-in wood flooring, we'd just use the self-leveling over the whole room, and use no membrane. g/l
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Old 05-23-2017, 01:07 PM   #3
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Fill crack
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Old 05-23-2017, 01:32 PM   #4
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That's what I thought , I have a concrete guy trying to bullshit me. Just needed someone to validate. Thanks
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Old 05-24-2017, 03:19 AM   #5
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Slabs crack more often than not. If the crack is in the middle and not through the footer or stem wall it is purely cosmetic. If you're laying tile, a crack suppression membrane is always a good idea even if the cracks are not present before the install.

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Old 05-24-2017, 04:29 AM   #6
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Where is the crack located? Is it a re-entrant corner? A lot of builders don't put steel in there. Our typical details calls out 2-#4x3' bars in all re-entrant corners that doesn't have a saw joint or construction joint.
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Old 05-24-2017, 06:25 PM   #7
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Most slabs have hairline cracks.

Run your finger across the crack. The surfaces across the crack should be level. If one side of the crack is higher than the other, it indicates settling. Depending on the amount of settling, you should get a foundation expert to look at it and determine the severity of settling and possible remedies.

Cutting the crack out and getting a section of slab poured will only get you four more spots for cracks.
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