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What is a built-up roof?

A built-up roof (BUR) is a flat or low-sloped roof whose membrane combines multiple layers of asphalt and reinforcing ply sheets. The layers form a water-resistant membrane; asphalt BUR commonly uses fiberglass ply felts.

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By InstaBids editorial team with AI research agents. Updated

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Why is a built-up roof considered a multi-ply roof?

A built-up roof is called multi-ply because its membrane contains successive reinforcing sheets with asphalt between them. ARMA describes fiberglass ply felts alternating with asphalt, and explains that the number visible in a cross-section identifies the system. A ply count describes layers within the membrane, rather than the number of separate roofs on a building. “The number of plies within a cross-section of the system will denote the type of system.” Source: Asphalt Roofing Manufacturers Association (ARMA), read 2026-10-31. “BUR systems predominately consist of alternating layers of asphalt (bitumen) and fiberglass ply felts that create a very durable water-resistant membrane.” Source: Asphalt Roofing Manufacturers Association (ARMA), read 2026-10-31.

What is a built-up roof in ARMA’s low-slope roofing glossary?

ARMA’s low-slope glossary defines a built-up roof by both its shape and its layered materials: a flat or low-sloped roof with asphalt and ply sheets. BUR is the abbreviation for built-up roof. This definition describes the membrane construction, rather than a particular surface color or a single product. “A flat or low-sloped roof consisting of multiple layers of asphalt and ply sheets.” Source: Asphalt Roofing Manufacturers Association (ARMA), read 2026-10-31.

Are BUR multi-ply roofs energy-efficient?

ARMA describes roofing insulation as part of the complete BUR assembly and connects that insulation with thermal resistance, expressed as R value. This supports looking at the insulation as well as the membrane when discussing energy performance. The cited passage gives no R value for a particular home and no numerical prediction of energy use. “BUR incorporates the roofing insulation into the monolithic roofing system and results in better insulation or a higher R value for better thermal performance.” Source: Asphalt Roofing Manufacturers Association (ARMA), read 2026-10-31.

How does my BUR multi-ply roof provide added protection?

ARMA describes fire and wind-uplift testing of built-up roofing systems through Underwriters Laboratories and Factory Mutual Research Corporation. These are assembly performance considerations. The reference does not identify the rating of a particular home’s roof; the specified system and its supporting documentation determine which performance results apply to that assembly. “Built-up roofing systems are tested through Underwriters Laboratories and Factory Mutual Research Corporation to meet very strict fire resistance requirements and ensure adequate uplift resistance under extreme wind conditions.” Source: Asphalt Roofing Manufacturers Association (ARMA), read 2026-10-31.

What advances have been made with BUR?

ARMA identifies low-fuming hot-applied asphalt and cold-applied methods as developments in BUR work. Cold-applied applications reduce the need for hot kettles and exposure to potentially irritating fumes, according to its explanation. The term built-up therefore describes the layered membrane; it does not by itself mean that every job uses hot-mopped asphalt. “In addition to the development of low-fuming hot applied asphalt, hot mopped jobs are giving way to new applications like cold applied.” Source: Asphalt Roofing Manufacturers Association (ARMA), read 2026-10-31. “Cold-applied applications reduce exposure to potentially irritating fumes; and the need for hot kettles, while still providing many if not all of the benefits and applications listed above.” Source: Asphalt Roofing Manufacturers Association (ARMA), read 2026-10-31.

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