Modified Bitumen Roofing
Modified bitumen is the modern evolution of traditional built-up roofing — a multi-layer system using asphalt modified with rubber (SBS) or plastic (APP) polymers for enhanced flexibility, durability, and waterproofing performance. Applied in two or more plies, modified bitumen creates a redundant waterproofing barrier that is more puncture and tear-resistant than single-ply membranes, making it the preferred specification for commercial roofs with significant foot traffic from mechanical maintenance personnel, rooftop HVAC service access, or other operational demands.
American Contracting USA is a certified Siplast modified bitumen installer and has completed modified bitumen projects ranging from historic government buildings (Cameron County Courthouse Annex) to commercial facilities and houses of worship across the Rio Grande Valley. Torch-applied modified bitumen is the most common application method — the torch provides consistent adhesion without solvents — while cold-adhesive systems are available where open flame is not permitted.
