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 Wrapping PVC pipe in concrete
Author: clesnick

What material can I use to wrap PVC pipe where it is under a concrete floor?

My state code requires the pipes to be wrapped where they penetrate concrete but when I described this and asked for wrapping material at the plumbing supply house, they did not carry it. Maybe I was just using the wrong name for the product.

Thanks for your help.

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 Re: Wrapping PVC pipe in concrete
Author: hj (AZ)

What is the PVC pipe used for? If it is drainage then you may have to wrap black "pipe wrap" tape where it penetrates the concrete floor, although you would be the first person I have heard of who had to do it. If it is going through "grade beams" in the floor, you have to wrap it with foam ribbon or rubber pipe insulation. Other than that, I do not know of any plumbing use where you could use PVC inside the house, much less under the floor.

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 Re: Wrapping PVC pipe in concrete
Author: clesnick

This is for drainage. The PVC pipes are the drains for a bathroom on a concrete slab.

Do other people pour concrete directly around PVC drainage pipe?

Thanks again.

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 Re: Wrapping PVC pipe in concrete
Author: hj (AZ)

We use ABS in this area, but we never wrap the drain lines coming through the floor. Only when they are in a grade beam or foundation wall. And then it is more to allow them room to move if the concrete settles rather than any corrosion factor.

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 Re: Wrapping PVC pipe in concrete
Author: nosaj (CT)

If it is under the concrete floor, it would be compacted in sand or other appropriate material, not wrapped. If penetrating a foundation, footing, etc. it is usually sleeved. I'm not sure exactly how much bigger the sleeve pipe should be. Check with the plumbing inspector. They should know what the deal is...

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 Re: Wrapping PVC pipe in concrete
Author: PlumberManDan (IA)

Just had 36 underfloor stub outs buried in concrete today. All COPPER lines stubbing out of a contrete floor MUST be protected from contact with concrete. Check with your local inspector for his or her opinion on the subject.

Plumbermandan

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 Re: Wrapping PVC pipe in concrete
Author: hj (AZ)

He is not asking about copper. He specifically specified PVC waste lines which are an entirely different matter.

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 Re: Wrapping PVC pipe in concrete
Author: PlumberManDan (IA)

True HJ, PVC/ABS need not be protected in MOST areas, Yet, Copper MUST BE. If you have DRAIN lines that extend thru the concrete floor then you normally need not protect them.

Plumbermandan

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 Re: Wrapping PVC pipe in concrete
Author: royboy (SC)

In North Carolina they require one wrap of polyethylene around PVC pipe that comes in contact with concrete. They say the expansion coefficients are different.

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 Re: Wrapping PVC pipe in concrete
Author: hj (AZ)

Very few materials have the "same coefficient" of expansion.

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 Re: Wrapping PVC pipe in concrete
Author: Anonymous User

Here in CA everyone wraps ABS drains with foam wrap when it's covered with concrete. I get it in 100' rolls (about 4" wide and 1/4" thick) from the construction supply house. They usually sell it as expansion joint material.

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