Whole-Home Repiping in Arcadia, Phoenix

“The kitchen is at one end of the house, and the main bath is at the other.”

A long floor plan, one long attic.

On a single-story ranch, the attic usually spans the whole house, so a main line can travel its length and drop down to each room that needs water.

“Our water heater is in the garage, so the new pipe would start there.”

The heater connection gets its own treatment.

The design guide's installation advice says PEX “may be connected directly to residential electric water heaters, if the local code and manufacturer’s instructions allow,” and that “Flexible metal water heater connectors may be needed in some instances.” At your heater, the connection follows the code the City enforces and the pipe maker's instructions.

“We'd hate to see the living room ceiling opened up.” and “There's a skylight over the hallway, and the shaft goes right through the attic.”

Both of those are route questions, and both are answered before a single opening is cut.

Some rooms can be fed through a wall they share with a closet or a bathroom, which leaves a finished ceiling alone. A skylight is the other direction: a shaft that is not fully sealed lets daylight into the attic around it, and a supply line laid alongside would sit in that light for years, so the route keeps its distance from the shaft or takes a sleeve through that stretch. Ceilings you want left alone and daylight you cannot see are the two things that bend a route here, and they get decided together on the first walk.

The code printed on the pipe

PEX carries a material designation code, and the Plastics Pipe Institute says it “is required to be marked on all PEX pipe and tubing to indicate the level of chlorine resistance, as well as UV resistance.” In that code, the second digit is the UV rating: 0 means untested or below the minimum; 1 means one month of exposure; 2 means three months; and 3 means six months.

Light that reaches into an attic

The guide warns that “Indirect (diffused) and reflected sunlight also emit UV energy,” and that PEX left where sunlight reaches it after installation should be covered “with a UV-blocking sleeve or pipe insulation as approved by the pipe manufacturer.” In an attic, that means the stretches near gable vents or any opening that lets daylight in.

Why the ranch layout makes this matter

Arcadia's best-known houses are single-story ranches on large lots. A long, low house puts most of a repipe overhead, where the route runs for the length of the attic. The longer the attic run, the more of the job the rating, the sleeving, and the storage rules apply to.