Can PEX Be Buried in Concrete? What Newport Beach Homeowners on Slab Foundations Should Know Before a Repipe
PEX can be embedded in a slab under the right conditions, but that does not mean it is the best route. When under-slab PEX makes sense, the rules that apply, and why…
Many Newport Beach homes sit on concrete slabs with the original copper water lines buried underneath. When those lines start leaking, a common question is whether new PEX can simply go back into the slab. The short answer is yes, PEX can be embedded in concrete under the right conditions. The better question is whether it should be.
When PEX in concrete is allowed
PEX tubing is approved by its manufacturers and by plumbing code for installation in or under concrete when it is done correctly. The usual requirements include:
- Continuous runs with no fittings or joints buried in the slab.
- Sleeves where the tubing enters and leaves the concrete, so it is protected from abrasion and movement.
- Protection from sharp aggregate and rebar during the pour.
- Pressure testing before the concrete is placed, with the system kept under pressure during the pour so a damaged line is caught right away.
That works well in new construction or a major remodel where the slab is being poured fresh.
Why existing homes usually go overhead
In an existing house, putting PEX back in the slab means saw-cutting and trenching floors, removing finished flooring and patching concrete. It also leaves the new lines where they are hard to reach in the future. Running new PEX-A through the attic and down inside walls avoids breaking floors and keeps every line accessible. For a single slab leak, a reroute through walls or the attic is often the cleaner fix as well.
Newport Beach slab homes
Neighborhoods such as Eastbluff, Harbor View, Newport Heights, Corona del Mar and the Bluffs include many homes from the 1950s through the 1970s built on slabs with copper running under the floor. Near the bay and ocean, higher groundwater and salty soil can be harder on buried copper. Water is supplied by the City of Newport Beach Utilities Department, with some areas served by Irvine Ranch Water District.
When under-slab still makes sense
On some homes without attic access, such as certain flat-roof designs, or where a full remodel already has floors open, sleeved PEX under the slab can be the practical route. We look at the structure, the finishes and the long-term access before recommending one path over the other.
Permits and planning
Repipes are permitted and inspected through the City of Newport Beach. Inspectors will check sleeving, protection and testing on any lines placed in or under concrete. We coordinate with associations on parking and work hours.
Related reading
Read how to prepare your home for a repipe or how type L and type M copper compare. Neighbors can visit Costa Mesa, Irvine and Laguna Beach, or see every city we serve at repipeinc.com.
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Repipe OC, 23821 Hillhurst Drive, Laguna Niguel, CA 92677, (949) 524-2362, CSLB #1087885 C-36.
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Written by Repipe OC · CSLB #1087885 C-36 · 23821 Hillhurst Drive, Laguna Niguel, CA 92677 · (949) 524-2362