PermLok PermLok 1.0 and 1.5 interlocking standing seam architectural panels offer both strength and beauty for high-sloped roofing applications. SS Panel The SS panel’s 1-inch snap-on seam cap contains a factory installed sealant that provides exceptional resistance to water infiltration. TwinLok TwinLok™ metal roof panels offer an economical option for building owners. Roof Underlayments Roof Underlayments Underlayments are an essential component of a complete roofing system. Rainware IMETCO’s engineering team provides project-specific gutter and downspout calculations to ensure proper sizing and placement and provides custom details incorporating the gutter system into your IMETCO metal roof system. EZ Edge Systems Formed Metal Fascia and Coping Line IMETCO’s EZ EdgeTM fascia and coping systems offer proven reliability and pleasing aesthetics while also providing watertight protection for the perimeter of your roof.