Cobble Hill has been a designated New York City historic district since 1969, and that single fact shapes every roof job here. Exterior work on these houses needs a Landmarks Preservation Commission permit, including a flat roof that nobody can see. Hidden roof work that follows the Commission's rules is normally approved at staff level. The cornice, the mansard slate on the houses that have one, the skylights that can be seen from the sidewalk and any new rooftop bulkhead get much closer review. Knowing where that line falls is most of the job. A contractor who does not know it will either stop your project halfway or do work that has to come off.
The houses are mostly 1840s to 1880s brick and brownstone row houses, three and four stories, on narrow lots along Clinton, Henry, Amity, Congress, Warren and Baltic. Behind the cornice almost every one of them is a flat roof, and most are carrying multiple layers of old built-up and torch-down. The cornice is where the real trouble usually is. Water gets behind it at the roof to cornice junction, runs down inside the woodwork or the pressed metal, and the first sign an owner sees is paint failing on the top floor or a piece of the cornice coming loose over the sidewalk.
Access is the other reality here. Narrow lots, no driveways, parked cars on both sides and neighbors a few feet away on each side. We arrange staging and the dumpster before the crew arrives, and on a shared party wall we talk to the neighbor before we are standing on it, not after.
What we actually see in Cobble Hill: water entering at the roof to cornice junction and destroying the cornice from behind, three and four layers of old roofing on original decking, mansard slate at the end of its life on the houses that have one, and skylights and bulkheads added without thinking about what Landmarks will and will not allow.
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Q: Do I need Landmarks approval to replace my roof?
A: Yes, in a historic district roof replacement needs an LPC permit even when the roof is hidden behind the cornice. That hidden work is usually approved quickly at staff level. Anything visible from the street, including the cornice, mansard slate, a skylight that can be seen from the sidewalk and any new bulkhead, gets closer review. We tell you at the estimate which approval each part of your job needs, in writing, so you are not finding out from an inspector.
Q: My cornice is rotting. Is that a roof problem?
A: Almost always. Water gets in at the junction where the roof meets the back of the cornice and runs down inside it. By the time you can see damage on the face, the failure has been going on for years behind it. Repairing the cornice without fixing that junction means doing the same repair again in a few winters.
Q: How many layers can be on my roof before it has to come off?
A: The code sets a limit, but on these houses the practical answer arrives sooner. Three or four layers of built-up and torch-down on original 1860s decking is more weight than the structure was designed for, and it means nobody has seen the deck in decades. On a Cobble Hill row house we tear off rather than layer over, because the deck is where the surprises live.
Q: Can you match the slate on my mansard?
A: Yes, and in a historic district you generally need to. We source salvaged and new stock to match the existing color, size and profile, and we hold samples against the roof before anything is ordered. If an exact match no longer exists we tell you that up front rather than ordering the nearest thing.
Q: There is no driveway and cars are parked on both sides. How does this work?
A: It gets planned before the day, not on the morning. We arrange where the dumpster sits, where the crew stages and which day the sidewalk is affected, and we tell you and your neighbors in advance. On a shared party wall we speak to the neighbor before we are working on it.
Q: What does a flat roof cost on a Cobble Hill row house?
A: A tear-off and new membrane behind the cornice typically runs about $12,000 to $22,000 depending on the size of the house, how many layers come off and what the deck looks like once it is open. Cornice work and any Landmarks visible element is priced separately, because those are a different trade and a different approval path.
MLM Construction Group works out of 1717 Avenue P in Brooklyn, NY 11229. Cobble Hill is inside our regular service area, so estimates and emergency calls there are handled by the same crew, not subcontracted out.
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