CropKing covers a standard greenhouse with two layers of 4-year greenhouse film and inflation fans that add an insulating layer of air between the two covers. Aluminum cover locks attach the greenhouse coverings to the end arches and the perimeter of the greenhouse frame. CropKing's greenhouse cover materials include 8mm polycarbonate for the cooling wall (typically the south end) of the greenhouse and all of the necessary "H" and "U" channel as well as the Tek screw fasteners. The North end wall covering is not included and this wall should be insulated because little or no sunshine enters the greenhouse from the North end. It is best to side the North wall with the customer's choice of siding and insulate it. Find greenhouse cover materials here or contact us for more information on our greenhouse coverings.