Standing-seam steel.

Standing-seam steel is the right material for mountain homes (Bend, Hood River, the eastern slope of the Cascades), homes with significant snow load, and the small set of contemporary residential designs that call for the look. It is also, when specified and installed correctly, the right material for commercial pitched roofs at scale. Henrik trained on standing-seam in Sweden — where the technique is the dominant residential roofing system — and the firm has installed standing-seam continuously since 2003.

We install twenty-four-gauge Galvalume-coated steel, mechanically seamed, eighteen-inch panel widths, Kynar 500 PVDF finish in slate-gray, weathered-copper, charcoal, matte-black, or the manufacturer’s heritage-green. Concealed fastener. We do not install exposed-fastener panels — R-panel, corrugated, or screwed-through ribbed metal — on residential. Their expected service life is half what a true standing-seam delivers, and the visual register is wrong for any home we would put a Cascade workmanship warranty on.

Snow guards in the eave courses where the building inspector requires them — typically the case in Bend, Hood River, the Coast Range, and the Cascade foothills above twenty-five hundred feet elevation. Where snow load exceeds the building code minimum, we run two courses of snow guards and we coordinate with the engineer.

Fifty to seventy years.

Standing-seam steel installed correctly will last fifty to seventy years in the Pacific Northwest. The substrate (twenty-four-gauge Galvalume — aluminum-zinc-coated steel) is independently rated for sixty-year-plus performance in non-coastal environments. The Kynar 500 PVDF finish carries a thirty-year manufacturer color warranty against fade, chalk, and de-lamination.

Within ten miles of the coast — Bandon, Lincoln City, Bainbridge Island, Astoria — saltwater accelerates Galvalume corrosion faster than the manufacturer’s spec sheet admits. We do not install Galvalume standing-seam in those zones unless the homeowner accepts the corrosion risk; we recommend natural-slate, cedar shake, or copper standing-seam in those situations.

In the mountains — Bend, Hood River, the Cascade foothills — the cold-temperature performance of Galvalume is excellent. We have installed standing-seam at elevations up to forty-six hundred feet on Cascade foothill projects with no premature failures.