Garage Door System GuideMartin Garage Doors builds steel sectional doors for homes. Its Classic line includes the Martin Standard, offered with several insulation configurations. Martin documents steel gauge, layer construction, and rail R-values on its product pages.
Martin Standard Construction
Martin describes the Martin Standard as a 25/26 gauge steel door in a 4-section 8 foot high configuration, with a 5-section version available by request.
Martin lists several insulation build-ups for the door, including steel plus insulation plus vinyl, steel plus two insulation layers plus steel, and steel plus insulation plus steel.
Rail R-Values and Warranty
Martin publishes rail-level R-values for the Martin Standard, listing an I4 configuration at R14 and I3 and I2 configurations at R8. The manufacturer notes that the R-value represents rails only and that total door R-value will vary depending on glass type.
Martin lists a 5 year warranty for the door.