Flat Roof Materials
Flat roofs require specialized waterproofing membranes since they don't shed water like sloped roofs.
- TPO (Thermoplastic Polyolefin): White, energy-efficient, 15-25 year lifespan. $5.50-8.50/sqft installed.
- EPDM (Rubber): Black or white, very durable, 20-30 year lifespan. $4.50-7.50/sqft installed.
- Modified Bitumen: Multi-layer, self-healing, 15-20 year lifespan. $4.00-7.00/sqft installed.
- PVC: Chemical-resistant, ideal for restaurants, 20-30 year lifespan. $6.00-10.00/sqft installed.
Flat Roof Area = Length × Width
Minimum drainage slope: ¼" per foot (1/48 pitch)
Standard membrane widths: 5', 10', or 12' rolls