Metal Roofing
Standing seam, corrugated, and commercial metal roofing systems — installed with precision. Built to last 50+ years and stand up to California wildfires.
Metal Roofs Built to Last
Metal roofing isn’t a new trend — it’s been protecting barns, farmhouses, and commercial buildings for over a century. What’s new is how beautiful and architecturally refined a modern metal system can be.
Cornerstone Roofing installs the full range of metal systems across Sonoma and Marin County: concealed-fastener standing seam for a clean architectural look, classic exposed-fastener corrugated for rugged character, and heavy-gauge commercial panels for agricultural and industrial buildings.
Every metal installation gets the same careful attention to fastening, sealant selection, and trim detailing. The difference between a metal roof that lasts 60 years and one that leaks in year 5 is all in the details — and we know them.
Choose the Right Metal for Your Project
Each metal system has its own strengths, aesthetic, and ideal application. Here’s how they compare — and how we install each one.
Standing Seam
Concealed fasteners hidden inside raised vertical seams — the premium choice for residential and commercial projects where aesthetics matter.
- 50+ year service life
- Hidden fasteners — no exposed screws to fail
- Clean modern look for contemporary homes
- 24 or 26 gauge Kynar-coated steel
Corrugated
Classic wave-profile panels with exposed neoprene-gasketed screws — the rugged agricultural look that’s been protecting Sonoma barns for generations.
- Budget-friendly entry to metal roofing
- Authentic rural character
- Fast installation on big surfaces
- 30+ year lifespan with proper fastening
R-Panel & PBR
Heavy-gauge commercial profiles built for warehouses, barns, shops, and agricultural buildings. Engineered for big spans and tough conditions.
- Wide coverage — 36″ per panel
- 26 gauge galvalume or painted finish
- Large-span capability
- Ideal for shops and agricultural buildings
The Best Roof for Wildfire Country
Sonoma County knows wildfire risk better than most. Since 2017, embers traveling miles ahead of active fire fronts have destroyed thousands of North Bay homes — most of them lost because something on the roof or around the eaves caught fire.
Metal roofing is the single most effective roof assembly for wildfire defense. It doesn’t ignite, doesn’t burn, and when installed with proper flashing and eave details, it gives your home the best possible chance of surviving an ember storm.