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Supply Pipe in The 1960s Homes

Build era is the best single predictor of what your supply pipe is made of, and the material is what decides whether the pipe itself can be the cause.

Outside tap mounted on a house wall, the fixture closest to the incoming supply

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Housing from this period generally means the changeover years. Copper is common by now but galvanized is still in the ground and in the walls, so what matters is not the build year but which sections were ever replaced. A pressure test at the outside tap tells you more than the age does.

What that means in practice

Two questions follow from the material. First, can the pipe itself narrow? Galvanized steel can and does; copper, PEX and polybutylene do not. Second, if the pipe is not the constriction, what is? In practice it is a valve, the supply into the property, or the municipal side.

A gauge reading settles which. Below 40 psi static is genuinely low; 45–80 psi is the normal band. Normal and low ranges as published by Grundfos in its homeowner guide to low water pressure.

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Other eras

Build era is a strong predictor, not a guarantee. Plenty of houses have had part of the supply replaced and part left alone, which is exactly why a pressure reading beats an assumption.