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concrete/plumbing question

Old 02-06-2006, 08:11 PM
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Default concrete/plumbing question

I have a copper pipe that is going to have concrete poured around it. I have been told it needs a sheath of some kind to protect it from the concrete - any ideas what I should wrap the pipe in before they pour?
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Old 02-06-2006, 08:14 PM
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Default Re: concrete/plumbing question

I don't know why you have copper, PVC is the thing you put around it. Copper responds to temp change.
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Old 02-06-2006, 08:20 PM
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Default Re: concrete/plumbing question

I have copper from the house being built in 1974 - will someone answer the question?
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Old 02-06-2006, 08:34 PM
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Default Re: concrete/plumbing question

You should run the tubing/pipe through a noncollapsible sheath/ tube to facilitate it's removal/repair should it ever develop a leak. If you can insulate it even better IMHO. I am not a contractor but have had to repair copper pipe in a slab and let me tell you it's a PITA.
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Old 02-06-2006, 08:40 PM
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Default Re: concrete/plumbing question

I just had installed nearly 3000 feet of Pex tubing. Most of it is in concrete for RFH. If it were me I would at least sleave it in some Liquid Tite conduit. Who wants to jack out copper pipe for whatever reason in X amount of years?

If it did not require a sleeve, (conduit) why does the building code say it must in in one???
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Old 02-06-2006, 08:47 PM
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Default Re: concrete/plumbing question

Either coat it with asphalt or wrap it with 2 layers of heavy plastic. Calcium in concrete will eat thru copper in time, but we'll both be long dead before that happens.
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Old 02-06-2006, 08:50 PM
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Default RE: concrete/plumbing question

The copper around here that is installed in concrete(passes thru)is run through a vinyl sleeve.
Its not a rigid sleeve, but is more along the lines of a collapsable piece of hose. It comes on a roll. You just unroll what you need and slide the copper thru it.
A plumbing supply house should have it. I can't remember seeing it a Lowes etc., but I've never really looked.
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Old 02-06-2006, 08:50 PM
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Default Re: concrete/plumbing question

What I see down here in the new construction slabs, is a thin sheath type thing red for hot, blue for cold. It is niether water tight or crush proof. I think it is used for corrosion protection. More than likely you could cruise the local Home Depot and find some.
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Old 02-06-2006, 09:03 PM
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Default Re: concrete/plumbing question

Wrap it in vinyl or PVC pipe - either will work.
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Old 02-06-2006, 09:06 PM
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Default Re: concrete/plumbing question

Where is the pipe in question? Is it the main supply line for the house? Horizontal or vertical? I'm assuming it was there from original construction?
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Old 02-06-2006, 09:31 PM
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Default Re: concrete/plumbing question

I use armour-flex, basicaly black foam pipe insulation. Use it where the copper would make contact with the slab, on lines in the ground below the slab, it's not required, although it would help on heat loss on hot lines.
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Old 02-06-2006, 09:31 PM
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the pipe is a vertical pipe coming up thru my dock wall cap for a water spigot for the dock. I have found the answer - I heavy duty swim raft that I cut a tube out of and will slide over the whole mess below and above the concrete - will duct tape and zip tie it on...
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Old 02-06-2006, 09:32 PM
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Default Re: concrete/plumbing question

Another suggestion

Run it through gray electric PVC pipe. You can buy very long elbows (called a sweep ell) for any bends you may have to make.
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Old 02-06-2006, 09:58 PM
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Default Re: concrete/plumbing question

Make a small form around the pipe with 2X4's then pour the floor. When the floor has cured remove the box form. Wrap the pipe in several layers plastic. Then get a bag of Sacrete sand mix and finish the pour. The Sacrete will not adhere to the concrete floor but will look simular when finished. But if you have to get to the pipe the Sacrete will break up easily.
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Old 02-07-2006, 12:57 AM
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Default Re: concrete/plumbing question

I just finished doing mine, code required PVC to sheath the 3/4" soft copper main when passed through concrete.
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Old 02-07-2006, 01:04 AM
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Default Re: concrete/plumbing question

As said above the cement WILL eat the copper , it's a chemical reaction and it does it faster than you think.
If installed with a sheath as stated above you will have no problems.
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Old 02-07-2006, 08:21 AM
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Default Re: concrete/plumbing question

morechaching - 2/6/2006 7:47 PM

Either coat it with asphalt or wrap it with 2 layers of heavy plastic. Calcium in concrete will eat thru copper in time, but we'll both be long dead before that happens.
Ditto, except it will cause problems in less time than you would think.
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Old 02-07-2006, 08:43 AM
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Default Re: concrete/plumbing question

I think that for the alkalines in the concrete to attack the copper, it would also have to be exposed to oxygen. Reason I say that is when my dad built the house I grew up in, it had a 6" structural slab on the first floor. (basement underneath). The slab had copper tubing running thru it, connected to a boiler giving us warm radiant heat. House was built in 1950 and as of the mid 90's they were still using the same heat system.
I agree though that for copperor any piping material penetrating a slab, it should be sleeved.
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Old 02-07-2006, 08:58 AM
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Default Re: concrete/plumbing question

Glen E - 2/6/2006 8:31 PM

the pipe is a vertical pipe coming up thru my dock wall cap for a water spigot for the dock. I have found the answer - I heavy duty swim raft that I cut a tube out of and will slide over the whole mess below and above the concrete - will duct tape and zip tie it on...
As a suggestions - run two of them while the wall is excavated. This way, if the first one fails, rather than dig up your yard to find the problem, you just abandon it and switch to the other.
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Old 02-07-2006, 10:03 AM
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Default Re: concrete/plumbing question

Now this never dawned on me earlier I just assumed, you are running soft copper right?

And now that I'm thinking, I wouldn't be concerned with wrapping the copper to protect it from the concrete, I'd be worried about the concrete cracking and sheering the copper lines. Therefore the best protection you could get would be a PVC or ABS sleeve.
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