Basic 2 layers of 10 mm polycarbonate (Clear or opal version) Standard polycarbonate windows from Tulderhof always consist of 2 layers of 10 mm polycarbonate, a frame, a PVC profile and a 10 mm special U-profile. Advantages: › Good insulation value due to the still air between the 2 polycarbonate windows › Windows fit together well › Low maintenance All polycarbonate windows are available in any size and for any wall type. You can also install any type of ventilation valve between the windows. You can order the windows in 2 types: › Clear (blurred view) › Opal/milky
