Why pipes fail in older Cambridge buildings
Many Cambridge homes still carry sections of galvanized steel supply pipe, which rusts from the inside until a threaded joint lets go. Later repairs added copper that develops pinholes, and renovations added PEX that can fail at fittings. Because so much of the plumbing runs inside plaster walls and between floors of stacked units, a failure often goes unseen until water shows up somewhere else. Frozen lines have their own page: frozen pipe cleanup.
- Corroded galvanized joints in basements and kitchen walls
- Pinhole leaks in older copper
- Failed fittings on newer lines
- Old shutoff valves that crack when finally turned
Cleanup without gutting the house
The extraction crew pulls standing water first. Then the tech who does the walkthrough maps moisture with thermal imaging and pinless meters, because water from a burst pipe runs along joists and down balloon-framed wall cavities far from where it started. Only the plaster, drywall and flooring that cannot dry in place come out; the rest dries through small access holes with air pushed into the cavities.
Speed matters because clean supply water does not stay clean. After about 48 hours it picks up contamination from the materials it soaks into and is treated as Category 2, which means more removal. The EPA WaterSense leak page is a useful checklist for spotting small leaks before they turn into big ones.
Know where the main shutoff is before you need it, and test that the valve actually turns. Old gate valves often seize.
Drying framing, floors and ceilings
The drying team sets air movers to the evaporation load of each room and runs LGR dehumidifiers, with readings on framing, subfloor and old-growth hardwood every day. Hardwood that cupped from water often flattens as it dries, so it is dried before anyone decides to replace it. The full process is on the structural drying page. Cold weather pipe care is covered in the Ready.gov winter weather tips.
- Category. Category 1 at first, treated as Category 2 after about 48 hours.
- Class. Class 2 to 3 when walls, ceilings and floors are wet.
- Equipment. Extraction, thermal imaging, air movers, LGR dehumidifiers and wall cavity drying.
- Goal. Framing and subfloor within 2 to 4 points of a dry reference material.



