The felt will protect the shed or summerhouse from the weather. beware cheap roofs made from chipboard, osb board or cheap plywood. however when i talk about wooden roofs this does not mean chipboard, osb, (oriental strand board), wafer board, sterling board of cheap plywood. whilst technically these are all wooden roofs they are made from a. On saturday i collected a couple of 18mm sheets of plywood. since this is my first attempt at carpentry i was unaware of just how heavy and awkward it would be to manouver these sheets, though i soon found out. due to requiring extra tools for cutting the sheets to size, the roofing job for the shed hasn't been completed.. Plywood 8 x 4; roofing sheets; also shop in. also shop in ideal for flooring, lining your shed, replacing shed roof or even partitions collection from bedworth any questions please ask can deliver loc... mdf chipboard plywood sheets 600 x 200 mm new sheets bargain