Specifications of shed materials. 13mm kiln dried tongue + groove cladding.(Nominal) 61x38 cls kiln dried framework (smooth planed) 3"x2" 61x38 cls kiln dried floor bearers (3"x2") 61x38 cls kiln dried roof joists(3"x2") 1" thick floorboards (planking) 13mm kiln dried t+g roof cladding (No chipboard/ plyboard or OSB used in our sheds/ buildings at all.) Sheds/buildings made to customer spec