The Five Flat-Roof Systems in 2025–2026
Each system has a sweet spot. Network contractors quote the right one for your situation, not the one they happen to install most.
- TPO — single-ply, heat-welded seams, white reflective, 20-yr warranty, $7–$12/sq ft. The default for new commercial in Cook County
- EPDM — single-ply rubber, adhesive seams, 20–30 yr life, $5.50–$9.50/sq ft. The residential add-on default
- PVC — single-ply, chemical resistant, heat-welded, 25–30 yr, $9–$14/sq ft. Best for restaurants and roofs with grease exposure
- Modified Bitumen — torch-down or self-adhered SBS/APP, 18–22 yr life, $6.50–$11/sq ft. Strong impact resistance, good for hail-prone sites
- Built-Up Roof (BUR) — multi-ply with asphalt and gravel, 20–30 yr, $8–$13/sq ft. Legacy system, still installed on heavy commercial
