Modified Bitumen APP Roofing

Modified bitumen APP roofing is a multi-ply flat roof system built for durability. Layers of asphalt-based membrane, reinforced with polymer, are torch-applied so they fuse into a single tear- and puncture-resistant surface. It's a common choice for property owners who want a low-slope roof that can stand up to foot traffic, temperature swings, and the freeze-thaw cycles typical of Chicago weather.

Where This System Fits

Multi-ply flat roofs — the torch-applied layers add reinforcement where a single membrane might wear thin.
High-traffic or exposed areas — the extra tear and puncture resistance holds up under regular use and rooftop equipment.
Edge and detail work — flashing and scupper systems on-site keep water moving off the roof rather than collecting at seams or edges.

Supporting the Installation

Fall Protection Safety Harness Systems — OSHA-grade harnesses keep crews secured during torch-down work.
Ice & Water Shield Membrane — self-adhering protection at vulnerable edges and valleys complements the modified bitumen layers.
Ponding Water Correction — sloping and tapering address standing water that can stress any flat membrane over time.