Two of the most common commercial low-slope options around Austin are TPO (thermoplastic polyolefin) and modified bitumen. Neither is universally best. The right choice depends on roof condition, slope, rooftop traffic, chemical exposure, and how your team maintains the building.
TPO in brief
TPO is a single-ply plastic membrane, often white for reflectivity. Seams are typically heat-welded. Property managers like the clean look and energy story in Central Texas heat — but installation quality at seams and flashings matters enormously. Thickness, reinforcement, and attachment method vary by manufacturer and project.
Modified bitumen in brief
Modified bitumen is an asphaltic multi-layer system (often APP or SBS sheets), installed with heat, cold adhesive, or self-adhered methods depending on product. It can be robust at detailing and familiar to many crews. Surface granules or coatings affect reflectivity and maintenance.
Practical comparison for managers
- Heat / reflectivity: White TPO is frequently chosen for Texas sun; mod-bit can be coated or specified with reflective surfaces.
- Seams: Welded TPO seams vs asphaltic laps — both can perform when installed correctly.
- Repairs: Your future vendor pool may be more comfortable with one system; ask what they service daily.
- Odors / occupied buildings: Some asphaltic processes involve heat or odors; discuss occupied-tenant constraints with bidders.
- Existing roof: Recover eligibility depends on wet insulation, attachment, and code — not brand preference.
Questions to put on every bid
Ask for manufacturer name, membrane thickness, attachment method, flashing details, and warranty type. Request core cuts or moisture survey when the roof history is unclear.
Request connections via contact or see TPO referrals and Austin TPO.