The brick walk-up tenements built in Greenpoint in the 1900s-1920s were plumbed with galvanized steel supply lines that are now between 70 and over 100 years old — well past the 40-70 year functional lifespan typical of galvanized in New York City's water chemistry. Internal corrosion in these pipes narrows the bore progressively, reducing flow and pressure at upper-floor fixtures while also introducing iron and manganese into the water supply. In a Greenpoint tenement we regularly find galvanized risers so restricted that only a fraction of the original flow reaches the third or fourth floor. The appropriate response in most cases is full building repiping in copper or PEX rather than targeted section replacement, because every section of galvanized in a building of this age is compromised — replacing one section relieves pressure on the next weakest point and shifts the leak location rather than solving the problem.
The original Italianate row houses built in Greenpoint from the 1850s through 1870s for shipyard and factory workers were constructed before modern plumbing codes existed, and the earliest buildings had minimal interior plumbing — drainage was added incrementally as city sewer connections became available. Cast-iron hub-and-spigot drain, waste, and vent systems were installed as these row houses were connected to the sewer network, and in many Greenpoint row houses you find cast-iron drain stacks from the 1880s and 1890s that have never been replaced. The two- and three-story scale of these buildings means the stacks are shorter and more accessible than those in six-story tenements, but the age of the iron and the condition of the lead-packed hub joints is the concern. Camera inspection through a cleanout is the fastest way to assess whether a Greenpoint row house drain stack is still structurally sound or approaching failure.
In Greenpoint pre-war tenements and Italianate row houses where we are repiping from original galvanized supply, both copper and PEX are significant upgrades, but each has trade-offs in these specific buildings. Copper is the traditional choice and has a proven multi-decade track record in NYC buildings; it is required by some building owners and co-op boards as the only acceptable material. PEX is flexible and can be run through existing chases with fewer wall openings, which is an important consideration in Greenpoint's 1850-1920s buildings with lime-plaster walls on lath that are expensive to restore. PEX-A with expansion fittings is the most robust PEX variant for NYC building conditions and is now widely accepted by the NYC Plumbing Code. We discuss both options with each building owner given their specific layout, access constraints, and finishing requirements.
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