Multi-Wall Hollow Sheet are hollow or fluted polycarbonate sheets which have two thin walls separated by vertical ribs. The hollow air gap provides excellent thermal insulation property and the sheets are extremely lightweight. The vertical ribs also provide superb rigidity to these sheets. Multi-wall sheets are a product of choice for atria, vaulted skylights, canopies, awnings and large skylight domes in commercial areas. These sheets provide excellent economic value for such applications. Multi-wall sheets are available in clear, tints and opal white variants.