Reliable multi-ply flat roofing for commercial buildings. 20–25 year warranty, superior waterproofing, and easy maintenance.
Modified bitumen (often called "mod-bit") is a reliable and popular choice for flat and low-slope commercial roofs. Far superior to traditional built-up roofing, mod-bit systems provide exceptional durability, longevity, and a 20–25 year warranty. Installed in roll form with base and cap sheets, these multi-ply systems create a thick barrier that effectively prevents water intrusion.
Modified bitumen has been protecting Austin commercial roofs for decades, and for good reason. It’s the multi-layer approach to flat roof waterproofing: a base sheet, one or two modified bitumen plies, and a cap sheet create redundant layers of protection that single-ply systems can’t match.
When to choose mod-bit: Buildings with heavy rooftop foot traffic (HVAC technicians, maintenance crews), properties where puncture resistance matters (retail with rooftop signage), and owners who want a proven system with a 30+ year track record in Austin’s climate.
Torch-applied vs. self-adhered: We install both. Torch-applied creates the strongest bond but requires certified torch operators. Self-adhered (peel-and-stick) eliminates fire risk and works well for re-roofs over existing systems. As a Polyglass certified installer, we recommend the right method based on your building’s specifics.
Modified bitumen runs $5–$8 per square foot installed, making it competitive with TPO for most commercial applications. A 10,000 sq ft commercial roof typically costs $50,000–$80,000 for a full mod-bit system with manufacturer warranty.
The higher cost vs. TPO buys you superior puncture resistance, better performance under ponding water (which Austin flat roofs inevitably experience), and a system that can be patched and maintained by any commercial roofer — not just the original installer.
Need a modified bitumen roof for your Austin building? As Polyglass certified installers, we bring manufacturer-trained expertise to every torch-applied and self-adhered installation. Call (512) 360-8206 for a free assessment of your current roof condition and a detailed quote.
They serve different needs. Modified bitumen is better for heavy foot traffic, ponding water tolerance, and buildings that need frequent rooftop maintenance access. TPO is more energy-efficient and costs less. We install both and recommend based on your building’s specific requirements.
Two methods: torch-applied (strongest bond, requires certified operators) and self-adhered (no flame, lower installation risk). As Polyglass certified installers, we’re trained in both methods and recommend based on your building type and existing conditions.
20–25 years with regular maintenance. The multi-layer construction provides redundancy that single-ply systems lack — if one layer is punctured, the layers beneath still protect your building while you schedule a repair.
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