Multi-ply built-up roofing systems have protected American commercial buildings for over a century. When your building demands proven, redundant waterproofing — BUR delivers.
We design and install BUR systems to exact specifications — from 3-ply to 5-ply configurations — matching ply count and surfacing to your building's thermal, structural, and durability requirements.
Three alternating layers of bitumen and reinforcing felt — the standard commercial spec balancing cost, weight, and long-term waterproofing performance.
Additional plies for critical facilities, aggressive climate exposure, or buildings requiring maximum redundancy and longevity.
Flood coat and aggregate (gravel or slag) topping — durable UV protection and fire resistance with proven 30+ year performance.
Modified bitumen or smooth asphalt cap for lower-slope applications where aggregate could create drainage issues or added weight concerns.
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Built-up roofing (BUR), also called 'tar and gravel' roofing, is one of the oldest and most proven commercial roofing systems. It consists of multiple alternating layers of bitumen (asphalt or coal tar) and reinforcing ply sheets, topped with a layer of gravel or a mineral-surfaced cap sheet. BUR systems create a thick, durable, redundant roofing membrane.
A standard built-up roof consists of 3 to 5 alternating layers of bitumen and ply sheets, plus a top surfacing layer of gravel, mineral granules, or a reflective coating. More layers generally means greater durability and redundancy. On Top Commercial Roofing designs BUR systems to match your building's traffic, drainage, and performance requirements.
Built-up roofing systems are known for exceptional longevity. A properly installed and maintained BUR system can last 20 to 40 years. The multiple layers provide built-in redundancy — if one layer fails, the others continue to protect the building. Regular inspections and minor maintenance are key to reaching maximum service life.
BUR systems offer several advantages: multiple redundant waterproofing layers, excellent resistance to foot traffic and mechanical damage, proven performance over decades, resistance to fire (especially gravel-surfaced systems), and the ability to be re-coated or re-surfaced to extend service life. Built-up roofing is a trusted choice for large commercial buildings, warehouses, and any application requiring maximum durability.