Torch-Applied
A flame melts the sheet into the layer below for a strong bond, requiring strict fire precautions.
Modified Bitumen Roofing Services in Bronx, NY
Modified bitumen is a layered, asphalt-based system long used on Bronx flat roofs. We install and repair it, with careful attention to fire safety.
What Is Modified Bitumen Roofing?
Modified bitumen is a layered roofing system made of asphalt sheets, reinforced with fabric and improved with polymers for flexibility. Instead of one large sheet, it is built up from one or more plies, usually finished with a protective cap sheet.
Benefits of Modified Bitumen Roofing
- Layered construction adds redundancy against a single point of failure.
- Long track record on low-slope roofs, with decades of use.
- Flexible in temperature swings, thanks to polymer-modified asphalt.
- Multiple application methods, so we can choose one that suits your building.
Modified Bitumen Roofing Applications
Modified bitumen is used on flat and low-slope roofs of houses, row houses, apartment buildings, and commercial properties across the Bronx, often alongside EPDM and TPO as one of the three common flat roof choices.
Modified Bitumen Installation Process
Modified Bitumen Roof Repair
Repairs focus on granule loss, cracked laps, blisters, and flashing failures. We clean and prepare the surface, then apply a patch or seal compatible with the existing membrane, since mixing incompatible materials is a common reason repairs fail.
Modified Bitumen vs. Other Flat Roofing Systems
The core difference is layers versus a single sheet. Modified bitumen builds up multiple plies for redundancy, while EPDM and TPO rely on one continuous membrane with welded or glued seams. Each approach has real strengths, and the best choice depends on your roof and budget.
Maintenance and Service Life
A well-installed and maintained modified bitumen roof commonly lasts 15 to 20 years. Regular checks of the cap sheet, laps, and flashing catch small problems before they become bigger repairs.
Cost Factors
| Factor | How It Changes the Job |
|---|---|
| Application method | Torch-applied, cold-applied, and self-adhered systems differ in labor and safety requirements. |
| Number of plies | More layers add material and installation time. |
| Roof size and complexity | More laps, penetrations, and edges add detail work. |
| Fire safety measures | Torch work may require permits, fire watch, and specific certifications. |
Frequently Asked Questions
Is torch-applied roofing safe?
It carries real fire risk because it uses an open flame near combustible materials, so it must be done with strict precautions. Hot work is regulated in New York City, and we follow the required safety procedures.
What does the cap sheet do?
The cap sheet is the top, protective layer of a modified bitumen roof, often surfaced with granules to shield the layers below from sun and weather.
Can a modified bitumen roof be coated?
Often, yes. Reflective and protective coatings are used on sound modified bitumen roofs to add protection or reduce heat, as long as the surface is clean, dry, and compatible with the coating.
How long does modified bitumen roofing last?
A well-installed and maintained roof commonly lasts 15 to 20 years, depending on the application method, traffic, and exposure.
Can modified bitumen be installed without a torch?
Yes. Cold-applied and self-adhered systems avoid open flame entirely, which can be a better fit for occupied buildings or where a torch is impractical.
What causes granule loss on a modified bitumen roof?
Sun exposure, age, and foot traffic wear down the granule surface over time. Heavy granule loss in gutters is a sign the cap sheet is aging and worth a closer look.
Call Bronx Roofing Pros
Request a Modified Bitumen Roofing Estimate
Describe your roof and we will tell you what suits it. Call (718) 719-0780.
(718) 719-07802243 White Plains Rd, Bronx, NY 10467