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TPO is a heat-welded single-ply membrane common on commercial and low-slope roofs. It is white and reflective, and seam quality is what mostly decides its lifespan.
For Cascade County, NOAA lists 14 hail reports (largest 1.5 in), 34 damaging-wind reports (up to 68 mph) and 0 tornado reports from January 2024 to June 2026. These count reports, not damaged roofs.
ASOS station KGTF Great Falls Airport thunderstorm wind gust. Social media relayed a report of wind damage to a home roof and a barn roof in Great Falls due to thunderstorm winds.
Public reported 1 inch hail. Time of report estimated via radar.
Ambient weather station measured gust.
Source: NOAA NCEI Storm Events Database, data through Jun 30, 2026. All storm reports for Simms
| Job | Typical US range |
|---|---|
| Flat roof (TPO / EPDM), average home | $5,000 – $12,000 |
National planning ranges for an average ~2,000 sq ft home, not quotes. Local labor, roof pitch, layers to remove, materials and permits change the price.
A thermoplastic polyolefin single-ply membrane whose seams are heat-welded; common on flat commercial roofs.
Both work. TPO is heat-welded and reflective; EPDM is a rubber membrane with glued or taped seams. Installer experience matters more than the name.
Many cities and counties require a building permit for roof work; the roofing company normally pulls it. Ask who is responsible and request a copy. Check with the Cascade County building department for local rules.
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