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Old 10-14-2010, 09:31 PM   #1
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backfill trench in slab for drain pipes


I am laying out plumbing for a bathroom on concrete slab. when filling concrete around drain pipes, can I just pour right up against the pipes or do you need some gap around the pipes? I vaguely recall the inspector saying something about sleeves on the pipe when I last talked to him a few weeks ago, but I can't remember now.

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Old 10-14-2010, 09:34 PM   #2
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backfill trench in slab for drain pipes


They need to be sleeved to keep them from cracking as the concrete cures/settles.

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Old 10-14-2010, 10:06 PM   #3
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backfill trench in slab for drain pipes


what kind of sleeve do I need to use? Does it stay there permanently?
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Old 10-14-2010, 10:27 PM   #4
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backfill trench in slab for drain pipes


For drain lines use a couple wraps of sill seal. (a couple extra wraps on the toilet stub allows room for the flange to glue on) Thats the thin insulation frammers use between concrete and the green plate. hold it in place with duct tape. It only needs to be as tall as the concrete is thick. For water lines, pipe insulation works good.
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Old 10-15-2010, 03:31 PM   #5
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backfill trench in slab for drain pipes


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(a couple extra wraps on the toilet stub allows room for the flange to glue on)
based on that, I assume i have to remove the wraps after concrete cures?
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Old 10-15-2010, 09:26 PM   #6
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backfill trench in slab for drain pipes


Thats correct. I use a drywall jab saw or a long hand held wood sawzall blade to clean out the wrap. Only takes a minute or two.
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Old 10-15-2010, 10:16 PM   #7
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backfill trench in slab for drain pipes


Oh no...the guy who I hired just concreted today with no sleeves...

Goodluck and thanks for the info

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