Slab leak repair question

Old 02-19-2021, 06:07 PM
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Used good pex and all piping is over insulated. So far, survived 8 degrees.
Old 02-19-2021, 07:27 PM
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lived in houses for 68 years here in Tx with pipes thru attics and never had a problem with them freezing.
even this past week I had no problems, but when I lost electrical power and water for over night in the teens , I closed the main valve and drained the pipes just to make sure.
1st time for me to do that
Old 02-20-2021, 06:12 AM
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Originally Posted by c_m_25 View Post
Now that we’re coming out of this massive winter storm, we’re going to be dealing with a lot of plumbing issues. Now, we never lost water or had anything freeze up, but I did get to thinking, how are slab leaks repaired if you have a post-tension slab? Seems like jack hammering through a foundation like this could be a dangerous venture given the dozens of steel cables running through the slab at high tension. Not only that, but if you cut one of those cables, don’t you compromise the structural integrity of the house?

How are these repairs done in this instance?
To avoid the tension cables, have someone X-ray the slab.
Old 02-20-2021, 06:30 AM
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Originally Posted by Onewolf View Post
Not here in Florida. Every home I am familiar with down here has supply/feed lines run up through the slab. Except for the ones that have been repiped because of copper pinhole leaks that have new supply lines installed through the attic.
I have seen it both ways.

While it does happen, pipes in the slab would be better insulated from freezing than in an attic. I am not a huge fan of overhead water or water heaters for the same reasons.

Someone mentioned the cost difference between a slab and a crawlspace. There is indeed a difference but outside of cost, there are benefits to both. I recently built a house on a slab, by every metric a very high end custom home, because I could get the house lower even with a raised slab. The owners wanted a home to live in forever and with that came the potential for wheelchairs or handicaps.

One step into the house makes for a shallow ramp. The curb less shower is also nice should they have to roll into it. This is only doable on a slab due to the clear space required by code between the ground and 1st floor framing.
Old 02-20-2021, 06:36 AM
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A couple miscellaneous comments:
Yes, slab-on-grade PT does exist and I've worked on them. Generally it's used to minimize cracking when getting away with thinner slab pours. I've seen it in several apartment complexes.
If you do have a PT slab, DO NOT try to sawcut through it! You will cut through all the strands and several bad things can happen. You can get away with a VERY shallow perimeter cut, but after that, it's detail chipping only. Those PT tendons don't always stay at the same depth, nor are they always constructed at the appropriate depth.
There are limits to how close to an anchor location or expansion joint where you can remove material without the edge catastrophically imploding on you, and also limits to how many tendons you can expose at once.
If you do damage the sheathing of the tendon but don't hurt the tendon itself, a good coat of flexidip will hopefully prevent a future corrosion break and a costly repair.
Only an engineer can tell you if it's okay to lose (permanently destress) a tendon. But if it's slab on grade and only to control cracking, it's being used in a pretty low risk scenario.
GPR of the slab isn't a bad idea, it will run you around a grand. True x-ray is very expensive. If you pop a cable and it needs to be repaired, you can assume $3-4k each location as a very rough number.

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