“I'm right on the water at Blaine and I want a standing-seam metal roof. What gauge and coating actually holds up to the salt air off Drayton Harbor?”
Our answer
This close to saltwater we spec 24-gauge steel with a Kynar 500 / PVDF coating rated for coastal exposure, plus corrosion-resistant clips and stainless fasteners. Standard 26-gauge builder panels and cheap fasteners corrode within a few years in the salt zone. We'll walk your specific exposure at Blaine, Birch Bay, or Semiahmoo and pick a system engineered for it.