In the Northeast, commercial roofs must withstand harsh winters, humid summers, and year-round precipitation. For low-slope and flat buildings, asphalt-based systems remain a reliable choice thanks to their strength, waterproofing, and long service life. Two of the most trusted options are Built-Up Roofing (BUR) and Modified Bitumen, each offering distinct advantages for different property needs.
From NYC healthcare facilities to Bergen County retail centers and Fairfield County manufacturing plants, these systems have protected valuable assets for decades. Understanding their differences will help you select a roofing solution that performs well today and for years to come.
Built-Up Roofing, often called “tar and gravel” roofing, consists of multiple layers of roofing felt or fiberglass mat embedded in bitumen. The system is finished with a protective surfacing such as gravel or a mineral-coated cap sheet.
BUR is a strong choice for institutional facilities, hospitals, and industrial plants that require dependable, long-term protection. Its weight and durability make it well-suited to buildings designed for heavy rooftop equipment and frequent service access.
Modified Bitumen is an asphalt-based roofing system enhanced with polymers for improved flexibility, durability, and weather resistance. It’s manufactured in sheets, typically installed in two or more plies — a base sheet and a cap sheet — for consistent, factory-controlled quality.
Both Built-Up Roofing and Modified Bitumen systems can be installed using several proven techniques, chosen based on building conditions, safety requirements, and project timelines:
Hot-Applied Asphalt — Traditional method for BUR and SBS-modified systems, creating a strong bond between layers.
Torch-Applied — Common for APP systems; requires strict fire safety measures and experienced installers.
Cold-Applied Adhesives — Low-odor option ideal for occupied buildings, avoiding open flames.
Self-Adhered Membranes — Peel-and-stick application that speeds installation and eliminates hot work.
Choosing the right method depends on building occupancy, climate, and manufacturer specifications. Hayden’s in-house crews follow all OSHA safety standards and local codes to ensure lasting performance.
BUR: Multi-ply redundancy often delivers 20–30+ years with proper maintenance.
Mod Bit: Typically lasts 20+ years; longevity can improve with reflective cap sheets and coatings.
BUR: Excels in heavy snow and foot traffic scenarios.
Mod Bit: SBS handles freeze-thaw cycles well; APP offers UV resistance for sunny rooftops.
BUR: Labor-intensive and heavier; higher upfront labor costs but long-term value.
Mod Bit: Faster to install, reducing labor time and tenant disruption.
BUR: Periodic gravel replacement or cap sheet repairs; drain and flashing inspections.
Mod Bit: Regular seam inspections; re-coating reflective surfaces as needed.
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Feature
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Built-Up Roofing (BUR)
|
Modified Bitumen (Mod Bit)
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|---|---|---|
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Lifespan
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20–30+ years
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20+ years
|
|
Installation Speed
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Slower
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Faster
|
|
Foot Traffic Resistance
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High
|
Moderate to High
|
|
Climate Strengths
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Snow load, heavy traffic
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Freeze-thaw (SBS), UV (APP)
|
|
Energy Efficiency
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Requires reflective coating
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Reflective cap sheet options
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|
Maintenance
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Gravel/cap sheet upkeep
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Seam/coating upkeep
|
|
Weight Load
|
Heavier
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Lighter
|
Regularly remove debris from drains, scuppers, and gutters to prevent ponding water that can damage membranes.
Check and re-seal areas around vents, HVAC units, and parapet walls to stop water intrusion.
Apply or maintain reflective coatings to slow asphalt aging and improve energy efficiency.
Repair punctures, blisters, or membrane separation before they spread.
Proactive surveys help catch early signs of wear and extend service life.
Choosing between BUR and Modified Bitumen comes down to your building’s needs, budget, and long-term plans.
For some properties, the decision also depends on lease terms, asset hold period, and ongoing maintenance budget. An expert evaluation can reveal which system offers the best ROI over your roof’s lifespan.
Hayden Building Maintenance Corp. has installed and maintained asphalt commercial roofing systems across New York, New Jersey, and Connecticut for over five decades. Our in-house crews follow all OSHA safety standards, local building codes, and manufacturer specifications to ensure every project delivers long-term performance. From NYC office complexes to Bergen County retail centers and Fairfield County industrial facilities, we provide tailored solutions that protect your building and your bottom line.
Get clarity on whether Built-Up Roofing or Modified Bitumen is right for your property. Schedule a complimentary roof evaluation and receive a photo-based digital report outlining your roof’s condition, risks, and options — no obligation.
Call 845-353-3400 to request your consultation today.
Hayden Building Maintenance Corp. is a trusted commercial roofing and waterproofing contractor serving NY, NJ, and CT, since 1973. We specialize in long-term roofing solutions for private schools, industrial facilities, and commercial properties.
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