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I recently had a Slab leak in my home in Indianapolis,IN. This is the 4th Slab leak since I've owned the home. I decided it was time to reroute all the Water lines. I thought this was best so I wouldn't have to deal with anymore slab issues. We had pex lines run through our attic space to the bathrooms and laundry area. Pex had to be ran under the concrete from the utility closet to the Kitchen. All the lines are tied to a Manifold. After reading some info on this site, I am alarmed that we may have frozen lines in the cold temp. The pex was run about 3 maybe 4 feet above the blown in insulation. The lines were fastened to the rafters. Black insulation was used to wrap the lines. I've been told that this is out of code in Indiana and that the lines need to be rerun inside the home. Just below celing. Then celing would have to be framed and new drywall attached. Help! Anyone that can provide any information about what we should do, would be appreciated.

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Well, bottom line is that the lines do need to be routed so that they are in warm space. Who was it that decided to mount the lines above the attic insulation? (A contractor from southern California where attic water line installs are common?) Maybe the proper fix for the under the slab routing of the water lines was to install 4" diameter PVC piping under/through the slab that has all gradual turn corners. Through this can be pulled the PEX water lines. If ever a leak you can pull new lines through the PVC without digging up slab once again. – Michael Karas Nov 15 '13 at 11:16
My money says the lines will freeze. PEX is pretty resilient to splitting when water freezes inside it, however the fittings are not. This is a leak waiting to happen. Also, I can't imagine a licensed/bonded plumber did the work; that could impact insurance coverage if a leak results in damage. – Ghost Nov 15 '13 at 12:52
Possible duplicate: Will a PEX run freeze if it's in the attic above a foyer? – BMitch Nov 15 '13 at 14:01
There are no joints in THE PEX in attic. – user18116 Nov 15 '13 at 16:38
There are no joints in THE PEX in attic. The fittings are all inside the home. So If the lines freeze in the attic that would mean the Brass Fittings, which are shark bites, could leak? It was a home remodeler that did the work. He said he had to reroute his home and has had no problems. But since my home is In Indiana, and it can get very cold in the winter, I am concerned. I just paid $2300.00 for this contractor to reroute lines. I had a Licensed Plumber come in to look at the recent work. Estimate $2400 to reroute inside. Ugh! – user18116 Nov 15 '13 at 16:52

The simple solution is to dig up the insulation, run the pipes along the top of the ceiling drywall (ie, just above the ceiling, rather than just below it), and put the insulation back on top of them, which puts them on the warm side of the insulation, "inside the home (thermally speaking)." Also to be a lot more careful when hiring "plumbers."

Otherwise, framing in a pipe chase below the ceiling would work, and might actually be easier in some cases (where crossing rather than running along ceiling joists.)

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I don't see where running your line under the ceiling insulation yes you should try to keep the fitting in the walls but also heat rises and if you insulate the lines i really don't see it freezes. Also if you feel its going the be real cold at times you can alway let the water run at trickle to stop from freezing.

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