Single-Ply Membrane vs Built-Up Roofing: Which is Best for Commercial Buildings?

Single-ply membrane and built-up roofing (BUR) are both proven commercial roofing systems. Here's how they compare across the factors that matter most.

Cost

Single-ply (TPO/EPDM): $5–$9/sq ft installed. BUR: $8–$14/sq ft installed. Single-ply is significantly less expensive to install.

Durability and Lifespan

Single-ply: 15–25 years typical lifespan; seam-dependent — seams are the primary failure point. BUR: 20–30+ years if properly maintained; multiple redundant layers provide inherent durability. BUR has a longer track record for longevity.

Maintenance Requirements

Single-ply: regular seam inspection and re-sealing critical. BUR: annual gravel redistribution and crack sealing; gravel protects from UV but can obscure damage. Both require regular professional maintenance to achieve designed lifespan.

Restoration Options

Both can be restored with silicone coating (BUR requires gravel removal first or specialized coating over gravel). Both avoid tear-off cost when eligible for restoration.

The Bottom Line

For new construction on a budget: TPO is the most common choice. For long-term durability investment: BUR or modified bitumen offers longer proven life. For existing roofs approaching end of warranty: both qualify for silicone restoration, making the comparison less relevant for building owners managing existing systems.