The 10 mm (twinwall) polycarbonate roofing sheets are now typically used for areas where you want to be dry but there isn't a great need for heat insulation. It does however have an insulation value and as by its nature the material is very lightweight and strong, you can use it to cover patio area's, gazebo's, carports, canopies, green houses, garden sheds etc, etc. The sheet is clear in appearence but gives an obscure view because of its stregthening flutes/ribs.