Restaurant Roofing in the Bronx, NY

A restaurant roof fails at the makeup air unit. The unit pulls fresh air into the kitchen, the exhaust fan beside it pushes greasy air out, and the curbs under both carry heat, grease and vibration all day. The sealant at the curb cracks, the flashing lifts and the first sign is a drip near the line during dinner service. A restaurant owner or landlord in the Bronx, NY should check the two curbs first, then the grease on the membrane around them, then the drain. Do it before the next heavy rain, on a quiet weekday.

Kitchens in Every Kind of Building

Restaurants in the Bronx sit in every kind of building. On City Island, most businesses are clustered along City Island Avenue, with seafood restaurants, antique stores and a small supermarket, and the island has three yacht clubs and several commercial marinas. In Belmont, Arthur Avenue is the primary thoroughfare, delis, bakeries and cafes crowd East 187th Street, and the Arthur Avenue Retail Market fills a block. In Pelham Bay, stores and eateries line Westchester Avenue, Buhre Avenue, Middletown Road and Crosby Avenue.

Each roof gets read on its own terms: count the penetrations, check the walls and decide from what turns up.

A restaurant inside a larger building shares a roof with other uses. Inside a shopping center, the landlord owns the roof while the tenant owns the exhaust, which makes the curb the place where responsibility blurs. In a hotel the kitchen vents through a much bigger system. We document who installed each fan and who maintains it.

Curbs, Grease and the Shared Wall

Curbs fail first: the exhaust fan curb and the makeup air curb, with sealant that dries and flashing that lifts. Grease on the membrane fails second, softening some sheets and hiding seams. The drain fails third, because a small roof with one drain has no backup. Fourth are the plumbing vents and the walk-in cooler condenser, each with a boot. Last is the wall, where a shared parapet with the next shop lets water cross between roofs.

A restaurant roof is small, so one failure is a big share of the whole. A cracked boot on a four-inch vent can wet an entire kitchen ceiling.

Fire is the other reason to care. Grease collects on and around the fan curb, and a roof with years of residue can burn hotter than a clean one if sparks or hot work reach it. We clean before any heat is used, choose cold or welded methods near exhaust where the system allows and keep an extinguisher on the roof during the work.

Both Curbs on a Dry Day

Go up on a dry day. Look at the sealant at both curbs, the surface within a few feet of the exhaust for softening or a greasy film, the drain strainer and every boot. Check the grease catch on the fan and the date it was last cleaned. Photographs of the worst curb and the drain, with the roof age and the last tenant complaint, get the flat-roof walk booked before a scope is drafted.

We map every penetration, test the surface near the fan and run an infrared moisture survey to find wet board.

Ask the kitchen when the hood was last cleaned and when the fan belt was last changed. A fan that vibrates or runs rough loosens its own curb.

Rebuild the Curbs, Then the Grease

Rebuild the curbs, then deal with the grease. A new curb flashing and fresh sealant is a leak repair that often holds for years. A grease catch cleaned on schedule keeps most membranes healthy. Where the sheet is already damaged, a grease-resistant membrane such as PVC may suit the next roof. Wet board or repeated failures mean replacement. The deciding factor is the grease. A roof that is wrong for its fan will fail again.

Price follows the curb count, the spread of grease, the wet board and the reach of the roof, and the proposal lists each separately.

Do not skip the walk after the repair. We probe the new flashing, run a hose over each curb and watch the ceiling below, so the owner sees the repair work before the crew leaves.

Before Service and on Closed Days

A kitchen cannot close for long. Work happens in the morning before service or on a closed day. Fumes stay clear of the dining room intake, the exhaust curb is protected and every section closes the same day. A fan that must be lifted is scheduled with the hood contractor, and on City Island the delivery windows are booked early. The owner receives the plan in writing, with the crew lead's phone number, before the first day.

Sound Wind, Snow and Heat

A City Island roof sits at the western end of Long Island Sound, so the edge metal gets a close look, and the island fell inside the Zone A evacuation for Hurricane Sandy, which put water 3.4 feet deep in Throgs Neck on October 29, 2012. With only one drain, a small roof has no margin for a record hour like Ida's 3.15 inches in September 2021. July highs average 95.7 degrees in Central Park, and a roof above a hot kitchen runs hotter still.

Sealants around a curb see wide swings, with roughly 30 inches of snow a year and a minus 15 degree record low. A spring look at every curb catches what winter cracked, and a fall drain check catches the rest. The Department of Buildings releases the 2022 NYC Construction Codes. Permits come from there. Hood cleaning and roof work are scheduled apart, so a grease crew and a roofing crew never share the same curb on the same morning.

Commercial Roofing Questions

How do I keep grease from ruining my roof?

Start at the fan. A grease catch cleaned on schedule keeps most of it off the membrane. Clean the roof with a mild detergent when a film builds up and avoid harsh solvents. If the membrane is already softened, replace it with a grease-resistant sheet and add a cleaning schedule to the maintenance plan.

Can the roof be repaired while the kitchen is open?

Usually, with planning. We work before opening or on a closed day, keep fumes away from the dining room intake and finish each section the same day. A fan lift is arranged with the hood contractor, and the owner signs off on the plan in writing.

Does a rooftop dining area change the roof?

Yes. Pavers, planters and railings sit on or through the waterproofing, and each post or leg is a possible leak. We lift pavers in sections, check the membrane under them and rebuild the flashing at every post before the deck goes back.

How can a small restaurant roof last longer?

Keep drains clear, keep grease contained, repair small defects quickly and have the roof walked twice a year. A small roof ages faster than a large one because each penetration is a big share of its area. A short visit in spring and fall costs little and catches problems while they are small.

What should I photograph before calling?

The worst stain from inside, both fan curbs from the roof, the surface within a few feet of the exhaust and the drain strainer. Note the date of the last rain and the last time the grease catch was cleaned. Those pictures tell us where to start and what to bring.