Duro-Last Roofing in Staten Island, NY
Inspection, repair and replacement of Duro-Last prefabricated PVC roofs on Staten Island, NY warehouses, flex buildings and retail roofs.
A numbered tag on a folded white sheet tells a crew exactly where that piece goes, and on a Duro-Last roof in Staten Island, NY the same logic runs backward at inspection time: every seam, boot and corner on the roof was made in a factory to a measurement, so a failure usually points to a measurement, a field weld or a hole someone added later. Duro-Last makes prefabricated PVC roofing membranes that are cut, welded and shipped to the job in custom sections.
Commercial Roofing Staten Island inspects, repairs and replaces these roofs, and the repair method follows from the fact that most of the welding on this sheet was done before it reached the site.
What a prefabricated roof is
The system rests on factory work. Sections of PVC sheet are fabricated in controlled conditions, with welded seams, preformed corners and boots for pipes and curbs shaped to the building's measurements. On the roof, the crew unrolls each section, fastens it along its edge and welds the field seams between sections with hot air. The result has fewer field welds than a roll-goods roof, and the factory welds tend to be consistent.
The tradeoff is that changes in the field are costly. A rooftop unit added after the sheet was ordered, a drain moved or a parapet that turned out to be an inch taller than the drawing all mean a cut-in, and each cut-in is a hand weld. Many of the findings we log on prefabricated roofs sit at those later changes.
The measurement walk
Before an order is placed, someone measures the parapet height to the quarter inch at every corner, counts the curbs and pipes, and notes each drain and scupper. The measurements become the drawing the factory cuts from, so errors travel a long way. We take them twice, on different days when the roof is large, and compare notes against the roof plan.
We also record what the survey is not about: the deck, the insulation and the existing layers. Those go in the inspection log with core cut results, because a sheet cut to the inch is a poor bet over a deck that holds fasteners badly. A tapered layout for drainage gets drawn at the same visit, so the factory's sections and the slope agree. A roof under Versico or Carlisle SynTec sheet is measured the same way before any replacement.
Where a custom sheet gives out
Field seams between the large sections are the long lines on the roof, and they are probed first. Preformed boots can crack or lose their seal at the pipe, and corners cut in the field are a weak point wherever a prefabricated piece did not quite fit. A puncture from a dropped tool or a service ladder shows up as a small tear, and the right answer is a welded patch, not sealant.
Ponding is the common enemy again. PVC tolerates standing water better than some membranes, yet water standing for days grows algae, holds dirt and loads the seams. Our membrane puncture repair and drain work both begin by finding out why the water is where it is.
Flex space, warehouses and retail
Prefabricated sheet suits roofs that are simple in shape and repetitive in detail, which describes a good share of the West Shore's industrial stock, where most of the island's industrial development sits. In Bloomfield the Matrix Global Logistics Park began operating in 2018 as a distribution center for companies such as Amazon and Ikea, and the Teleport industrial park at Travis's eastern edge houses mostly Internet and telecommunications companies. A business park listing does not prove a roof type, so each building gets a core cut before we name the system.
Retail businesses line the West Shore Expressway service roads in Travis, where West Shore Plaza went up with a Burlington Coat Factory as its lead store, and a long roof there can serve several tenants. The flex industrial roofing and Travis work both depend on a clear map of which tenant added which unit.
Getting sections to the roof
Folded sections are heavy and long, and they arrive on a truck that needs a place to stop. On the island, a delivery can be delayed by bridge-day traffic, and the Staten Island Expressway is one of the most congested roads in the city, so we schedule arrival early and keep the crane or hoist ready. Sections are laid out by their tags, checked against the roof plan and welded the same day they are unrolled.
Wind is the day's controlling factor. A large unfastened sheet is a sail, so we release only what the crew can fasten before the afternoon breeze, and we tie the leading edge down at night.
Storms, snow and the edge
The edge detail on any single-ply roof is tested by gusts like the 80 mph of Sandy in October 2012. We check the perimeter fasteners and the edge metal after a blow. Snow loads arrive in January, when the island can drop 27.3 inches in a day, as it did on January 23, 2016, and the thaw that follows tests the drains. A white PVC sheet sheds snow slowly, but a clear strainer lets it leave.
Repairing a custom sheet
Repairs follow the sheet's nature. We clean the surface, cut out the failed boot or corner, and weld in a new formed piece. A tear gets a welded patch with rounded corners, and an open field seam gets cleaned and re-welded, with the edge probed after. When the sheet is old and the insulation is wet, the option is a replacement, or a recover if a scan finds the board dry. A PVC roof of any make takes the same weld repairs, and a roof under the Sika Sarnafil name uses the same hot-air method.
The owner receives the photographs, the roof plan and a ranked list.
Field changes get the most attention afterward. Each rooftop unit, vent or hatch added since the sheet was installed is logged with a photograph and its flashing details, so the next owner or manager sees which cut-ins were made, when and by whom if the record exists.
Related Roofing Work
More roofing work that comes up alongside Duro-Last Roofing.
Commercial Roofing Questions
What happens when a prefabricated sheet arrives the wrong size?
It goes back, and the section is remade from corrected measurements. That is why we verify the numbers at the parapet and at each curb before the order goes in.
Can the old roof stay under a prefabricated sheet?
When it is dry and sound, yes, with a cover board or a separation layer between. A scan and a few cores decide, since a wet old roof under new sheet traps the moisture.
How long does a prefabricated order take to arrive?
The shop's queue sets the wait, so the order goes in as soon as the measurements are checked. We schedule tear-off after the sections are on site, never before.
Is a white PVC sheet right for a Staten Island roof?
White reflects heat in July, when the New York City mean daily maximum reaches 84.9 F, and PVC resists grease and exhaust. Drainage and edges decide more leaks than the color.
What does an owner supply before the measurement visit?
The roof plan if one exists, a list of planned additions such as new rooftop units, and access to every corner. Any equipment due to move should be on the list, since moving it later means a cut-in.