Commercial Roofing in East Elmhurst, Queens, NY

What happens to a roof when a building changes use?

Once the headquarters of a watch company, the Bulova Corporate Center now operates as an office center. Conversions like it raise a general point: an industrial or institutional roof may now cover offices, and the use below sets new rules, because ceiling finishes, computers and records tolerate water less than a factory floor does and a leak costs more.

On a converted building the first question is what was added. New rooftop units, exhaust fans, vent stacks and conduit each pierce the roof, and conversion work does not always flash them well. We count the penetrations, check each flashing and compare the roof's drainage with the building's current use. A core sample shows how many layers sit over the deck and whether the lower ones are dry, which decides between a repair, a recover and a replacement.

Occupancy affects the timing. An office center with many tenants has different hours from a warehouse, and some tenants run early or late shifts. We agree access, noise limits and any quiet periods with the manager, protect the interior below the work area and cover or move equipment before the crew opens the roof. Work proceeds in sections, each closed watertight before the next is opened, so a surprise shower never meets an open deck above a server room.

What does the airport edge change?

Working beside an airport adds planning questions. Crane and hoist placement may need approval, material staging must stay clear of access routes, and loose items on a roof are a hazard in wind. We raise those questions early, before the quote, so the owner knows what the schedule depends on. Near a flight path we also watch for debris, since a loose piece of edge metal or a torn corner of membrane is a roofing problem and a safety problem at once.

A flat roof with little to break the wind takes the full gust, as Hurricane Sandy's hurricane-force gusts across the metro area showed in October 2012. LaGuardia, in Queens, recorded 107 degrees on July 3, 1966, so heat also bears on large dark surfaces here. Edge metal and coping are checked for fastening, and sealants for sun damage.

How do the highway corridors affect a roof?

The Grand Central Parkway and I-278 carry heavy traffic past the neighborhood. A roof near busy roads collects soot and road film, and a dirty membrane runs hotter and ages faster. Exhaust fans and air intakes on those roofs draw in the same air. Where a roof is dirty, we wash it before any repair, since patches do not bond to grime, and we recommend a washable, reflective surface where the membrane is sound. A coating restoration over a clean, dry membrane is often the practical way to extend its life.

Fresh air intakes deserve a word. Roofing adhesives, primers and hot work produce fumes, and air handlers pull them into the building if the intake is nearby. We locate every intake on the walk, choose low-odor materials or cold-applied systems near them and ask the facility team to set dampers or shut the unit during the sensitive steps.

What about the shops along Ditmars, Astoria and Northern Boulevards?

Small commercial buildings on these boulevards have flat roofs with a single drain, a few vents and a parapet. The common failures are at the rear, where fans and ducts have been added, and at the drain, where leaves and trash collect. We walk the rear first. Tenants who share a building may each have their own equipment, and the roof carries all of it. A single report with photographs of each penetration helps the owner decide which tenant's unit is the source.

Owners in Corona and Astoria face a similar mix of boulevard shops, and the sequence of checks is the same.

Tenant equipment is the other recurring theme. Small businesses add dishes, antennas and condensers over the years, and the roof ends up with cables running across the membrane, units sitting on blocks and holes patched with sealant. We map what is on the roof, flag the items that no longer serve a tenant, and propose removing them. Every abandoned penetration removed is one fewer place for the roof to leak, and the roof plan shows the owner what each tenant has placed there.

How do cloudbursts test these roofs?

Hurricane Ida's remnants arrived September 1, 2021 and, for the first time, the city declared a flash flood emergency, with most of the deaths in Queens. A roof with one drain and no overflow fills fast in rain like that, so we confirm that drains are clear, strainers are in place and a second path exists. Where the parapet allows, an overflow scupper gives the water a way out. Correcting ponding water on a flat roof also reduces the weight the deck carries during a storm.

Winter completes the picture. Snow comes to about 29.8 inches in an average year, and ice at a drain or scupper can send meltwater backward under flashing. A drain that sits high or a roof that slopes the wrong way holds ice longest, and we correct those causes rather than relying on heat cable alone.

What is the next step?

Include the street and roof age, plus photos of the stain and the drain. We walk the roof, probe the seams and flashings and describe in plain steps what it is doing, ahead of any price. A first look at the drains and scuppers often answers the question.