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Old 09-28-2009, 07:56 PM   #1
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trenching suspended concrete


wondering if it's possible to cut a 4" wide by maybe 4" deep trench in a slap about 12" thick in most areas, to run drain pipe, no crawlspace only a few inches, will the slab crack I'm wondering any advice would be appreciated, thanks jd

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Old 09-28-2009, 08:03 PM   #2
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What, exactly, are you calling "suspended" concrete?

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Old 09-28-2009, 08:33 PM   #3
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trenching suspended concrete


it's not sitting on the ground a block foundation is holding it up, at one point there was a form in place but that has rotted away
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Old 09-28-2009, 08:37 PM   #4
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trenching suspended concrete


You don't have anything in your profile to suggest where you might be. May I guess somewhere around Texas? This is important because you could easily have a "post-tensioned" slab. And these are not something anyone other than an expert would want to alter by trenching.
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Old 09-28-2009, 08:45 PM   #5
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In Virginia, I'll call a pro, thanks for your time, was hoping I could try it, but to much of a gamble, jd
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Old 09-28-2009, 08:57 PM   #6
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trenching suspended concrete


The full magnitude of expansive/compressive soil hazards in Virginia is unknown, although parts of Chesterfield County have experienced significant impacts to residential areas developed over expansive soils. The Coastal Plain, the Shenandoah Valley, and the Mesozoic basins around Culpeper, Farmville, Danville, and Richmond are the most likely areas to have expansive or frost-heave-susceptible soils; however, the exact distribution can only be approximated from current soil maps, and field visits to specific areas are necessary to determine the actual extent of these hazards.

If you can't find someone familiar with post-tensioned slabs in your area, try looking in the areas mentioned in the first paragraph.
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Old 09-28-2009, 09:03 PM   #7
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thanks for your help, i will look into this more
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Old 09-29-2009, 10:16 AM   #8
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trenching suspended concrete


Your plans - if, indeed, you do have a post-tensioned slab - should indicate where the cables run. They are usually on about 24" grids in residential homes. There is no problem, for the most part, with drilling or trenching in-between the cables. But it is not advisable to cut through one of the cables without a professional and experienced understanding of just what a post-tensioned slab is, and how it reacts.

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