Modified Bitumen Roof Cost Guide (Updated 2025)

A low-slope modified bitumen roof with a tan granule surface.

Introduction This article should give you a pretty accurate idea of what the typical total installed cost will be for various types of modified bitumen roofs in 2025. You should be aware that the cost of any individual modified bitumen roof will depend on several variables, including roof size, roof complexity, local labor costs, the type …

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Modified Bitumen Roofing: What It Is, Types, Pros, Cons, Etc.

A torch wagon and a roll of modified bitumen roofing while roofers are torch-applying a modified bitumen roof membrane.

Introduction Modified bitumen roofing has been used on low-slope (“flat”) roofs for over fifty years. It’s known for being thicker and tougher than the prevailing single-ply membranes that dominate the low-slope roofing market today. Unlike built-up roofing (BUR), another bitumen-based roof system, modified bitumen roofing has kept a good-sized share of the commercial roofing market …

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