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Question DetailsAsked on 8/1/2016

How do you reroute pipes that are under post tension slab using PEX tubing if there are no plumbing manifolds?

What if there is only the main valve outside as the primary shutoff? This is a 3 story condo building with limited access. Is there always manifolds found and one shouldn't worry? The plumbing asbuilt drawings aren't really showing any.

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1 Answer


If only a main valve for the entire building, usually for a major interior repipe job the first thing would be to install a shutoff valve for only your unit, so the other units can be unaffected other than for that hour or so.

Manifolds are a pretty new thing - commonly older PEX jobs ran the tubing just like conventional pipes, from the entry point to the points in the house needing service, commonly one branch to bathrooms, one to ktichen, offshoots to boiler or water heater etc. If there is a manifold usually it is quite close to the main shutoff valve or the entry point to the building.

If using a Plumber for this, he should be able to figure it out pretty quickly. You can commonly hear their location by running water in that branch and using a stethoscope (metal head ones work WAY better, $10-15 at pharmacy department) to track down the line location.

Definitely don't want to be digging through a post tensional slab - but fortunately with water lines (as opposed to sewer) you can run nin walls, ceilings, etc so shoudl not be too tough to find a routing that will work - though need to try to minimize openings in the walls/ceilings to reduce the drywall/plastering and repainting costs afterwards. Commonly ceilings work better than walls where there is an option for long runs, following the joists as much as possible ot minimize the openings to drill through joists/studs. Also, convincing the pluber that he needs an extended bit to drill the holes can help - lets you drill through 2 studs and sometimes even 2 joists in each direction from an opening to reduce the number of openings needed.

Answered 3 years ago by LCD

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