Abstract: A drywall sheet is marked on the reverse side thereof with a plurality of bands; the bands are of two different types according to two modular dimensions of the sheet to form two grids, which aid in positioning drywall studs prior to the sheet being secured thereto. The obverse face is marked with two complementary marked grids to assist in positioning screws or other securing means. Preferably the obverse face has screws positioning intervals marked around the bounding edge thereof.