What materials can be used for the exterior and interior walls?
A. Exterior: we call for 1x tongue and groove planking (plywood can also be used; however, it’s more labor intensive as well as creates considerable waste of material), with either wood [cedar] shakes or shingles, or asphalt or fiberglass-impregnated asphalt shingles. However, a metal (aluminum alloy) roof can also be installed [over the sheathing base of the planks or plywood]. Interior: we call for drywall (a.k.a. gypsum board, sheetrock, or plaster board); however, t&g planks can also be used.