Single-Ply vs. Built-Up Roofing: Pros, Cons and How to Choose
By High Country Roofing · Family-owned commercial roofers in Emmett, Idaho
Most low-slope commercial roofs in Idaho are either single-ply membranes or built-up roofs. Both can serve you well. The right choice depends on the building, how it's used and your budget.
Single-ply: TPO, PVC and EPDM
Single-ply roofs are one layer of factory-made membrane over insulation. TPO and PVC seams are heat-welded, so the seams become one piece with the sheet. EPDM, the black rubber roof, uses tapes and adhesives at the seams.
- Pros: light weight, fast installation, white TPO and PVC reflect heat, and installation is clean and quiet with no hot asphalt.
- Cons: a single layer can be punctured by foot traffic or dropped tools, and seam quality depends on the installer.
- Good to know: PVC resists grease and oils, which makes it the pick for restaurants and food plants.
Built-up roofing (BUR)
A built-up roof is several layers of asphalt and reinforcing felt, usually topped with gravel. Modified bitumen is a close cousin applied in rolls.
- Pros: multiple layers make it tough and puncture-resistant.
- Cons: heavy, slower and more labor-intensive to install, and hot asphalt brings fumes and odor into occupied buildings.
How to choose
Ask what the building needs: Is there heavy foot traffic? Grease from kitchen exhaust? Can the structure carry more weight? Is the roof still sound enough to restore instead? We install Duro-Last PVC and TPO and restore aging built-up and single-ply roofs with coatings. Compare the options or book a free roof inspection and we'll tell you what fits your building.
Common questions
Is TPO or PVC better?
Both are heat-welded and reflective. PVC resists grease, oils and many chemicals, so it's better for restaurants and food processing. TPO is a strong, cost-effective choice for most other buildings.
Can an old built-up roof be restored instead of replaced?
Often, if it's still dry and solid. A coating restoration can seal it and add years of life without a tear-off.