A new-build owner opened the hose valve and the ceiling flooded: the pipe was never connected

The owner described the leak in a Reddit post, asking if new homes often come with serious plumbing defects. The rest of the plumbing worked. The problem was confined to the hose supply, which stayed hidden because its ball valve had been closed, according to The Cool Down. The owner said the builder, one of the best regarded in the city, was already working on it. The thread did not say whether repairs were finished or how much damage the water caused.

A closed valve is how a dead branch gets through. Section P2503.7 of the 2018 International Residential Code requires each finished water-supply system, or section of it, to be tested and proved tight at no less than its working water pressure, or with at least 50 psi of air for piping other than plastic, held for 15 minutes. A branch sitting behind a shut valve during that test was never under pressure. One commenter argued that the plumber, the general contractor and the inspector each had a chance to catch it with a pressure test, though no inspection record has shown who missed it.

Before drywall goes up, owners can ask when the supply test was run, at what pressure and with which valves open, and ask for the gauge reading or the inspection record. At the final walkthrough, open every valve you can find and run every outlet, outdoor ones included, along with any line stubbed out for later use. The owner told the thread the lesson was to test everything regardless of a builder's reputation.