Replacing Galvanized Plumbing During a Bathroom Remodel

Two pipes that look the same from the access panel can be very different inside, one clear and one nearly closed with scale, and that is the surprise waiting in many older Riverside, CA bathrooms. Galvanized steel pipe carries the water in houses of a certain age, and a bathroom remodel is the point where it gets seen, as the notes at bathroom remodeling riverside virtual strategist describe.

What galvanized pipe looks like after decades

Galvanized steel is coated with zinc, and over the years the coating wears and the pipe rusts from the inside. Mineral scale builds up in the bore, narrowing it. Water pressure at the vanity faucet drops, and the shower valve starves when someone runs the kitchen sink. Cutting a section out shows the story at once, with the opening sometimes no wider than a pencil.

Where the work stops

A bathroom remodel rarely stops at the bathroom wall. New copper or PEX supply lines tie into the old galvanized pipe somewhere, and the tie-in point is a weak spot, since the old pipe may crumble when it is cut or threaded. A careful crew follows the old line back to a place where it is sound, or replaces the run all the way to the main in the crawlspace or the slab access.

Plumbing rough-in at the open wall

With the wall open, new supply lines are run to the valve, the vanity and the toilet, and new drain lines are checked for slope and venting. The shower valve gets set at the right depth for the finished wall, which depends on the thickness of the cement board and the tile. A pressure test with the pipes capped holds before anyone closes a wall, and the inspector sees the work while it is still open.

Old drains and cast iron

Houses with galvanized supply often have cast iron or clay drains too. A cast iron stack that is rusted through at a joint gets a new section, and the shower pan drain is tied to it with the right fittings. The tile, waterproofing membrane and grout then go over plumbing that is no longer a question mark.

Why it is done now

Replacing a supply pipe behind a finished tile wall means breaking that wall again. Doing it at rough-in costs a few extra days and saves tearing out new tile later.