The outer and inner metal skins of Insulated Panels conform to the same specifications as the single skin painted panels described above. In addition, Insulated Panels have a factory injected polyurethane core. Thermal transmission data can be found in the Zamil Steel Technical Manual on Pre-Engineered Buildings.
Liner panels have one metal skin surface with polystyrene foam board adhered to it for better insulation. In the past 20 years, end-users, contractors and consultants have become increasingly aware of the losses associated with thermal transmission.
Insulation of various types is now used in all types of buildings. Zamil Steel was one of the first companies to introduce polyurethane sandwich panels in the Middle-East. Polyurethane has been recognized as the most resistant material to heat transmission.