TPO and EPDM flat roofing installation and repair for Long Island homes and commercial properties. Expert installation with proper drainage design across Nassau and Suffolk County.
Flat roofing on Long Island is most common on garages, additions, commercial buildings, and ranch-style homes. Done correctly with proper drainage design, a flat roof lasts 15–25 years with minimal maintenance. Done incorrectly, ponding water causes premature failure and expensive interior damage.
Greene Group installs TPO and EPDM flat roofing systems — the two most durable and widely specified options in the Long Island market. Every installation includes proper slope and drainage design to prevent the ponding that kills flat roofs prematurely.
| Factor | TPO (White Membrane) | EPDM (Black Rubber) |
|---|---|---|
| Seam Method | Heat-welded (strongest) | Adhesive or mechanical |
| Energy Efficiency | ✓ Excellent — reflects heat | Standard |
| Durability | Very good | ✓ Excellent — 30+ yr track record |
| Repair Ease | Moderate | ✓ Easy — patches bond well |
| Best For | Long Island summers, energy savings | All LI climates, repairability |
| Typical Cost | $6–$10 per sq ft installed | $5–$8 per sq ft installed |
Water standing more than 48 hours. The #1 killer of flat roofs. We re-slope and redirect drainage to eliminate it.
Air or moisture trapped under the membrane. Must be repaired before the blister ruptures and allows water infiltration.
Failed adhesive or weld seams on EPDM and TPO roofs. Caused by thermal movement or improper original installation.
Failed flashing at walls, curbs, and drains. The most common entry point for water on flat roofs.
Flat roof replacement on Long Island typically runs $4,000–$12,000 depending on square footage and system chosen. See our full cost guide →