Lixin 3-wall Rectangle-structure sheet increases the thermal insulation over traditional twin wall polycarbonate sheet, suitable for using in higher thermal insulation occasions. The sheet has been specifically designed for simple and fast installation. It won’t crack or split when cut or drilled. The lightweight structure can save more steel skeleton material and also has elegant appearance. Lixin 3-wall sheet has 6-16mm thickness options. All Lixin sheets are supplied with 10 years warranty.