For commercial and flat roofs in North Alabama, the two dominant choices are TPO (white thermoplastic) and EPDM (black rubber). Here's the head-to-head.
Option A
TPO (Thermoplastic Polyolefin)
Pros
- Reflective white surface (lower cooling cost)
- Heat-welded seams (very strong)
- ENERGY STAR rated
- Modern preferred commercial choice
Cons
- More vulnerable to UV degradation over 20+ years
- Some early-generation TPO failed prematurely
Best for: Commercial retail/office, southern climates (like AL), buildings prioritizing cooling efficiency
Option B
EPDM (Ethylene Propylene Diene Monomer Rubber)
Pros
- 50+ year proven track record
- Excellent UV resistance
- Easy to repair
- Affordable
Cons
- Black surface absorbs heat
- Tape/adhesive seams (less strong than TPO welds)
Best for: Industrial, warehouse, repairs/maintenance on existing EPDM
Our Verdict
For new commercial roofs in Alabama, TPO is usually the right call for cooling and modern performance. EPDM remains excellent for industrial and warehouse where the black surface isn't a concern.
Frequently Asked Questions
Can I install TPO over EPDM?+
Sometimes — recover assemblies exist, but inspection of the existing system is required first.