Type X gypsum wallboard as per ASTM C 1396 , for single layer applications , the wallboard will be applied vertically with no level joints.for different layer applications even joints are allowed at any rate separating of 8 feet, give that the joints in progressive layers are stumbled at any rate 12 inches. Absolute required thickness of wallboard will be resolved on premise of determined imperviousness to fire rating and the weight-to-warmed edge proportion (W/D) of the segment. W/D proportion of steel sections; basic shape W8*18 ,form profile - 0.499, box profile-0.67 For imperviousness to fire rating of one hour,one of the necessary layers of gypsum wallboard might be applied to the outside of sheet steel segments covers with 1-inch long sort S screws divided in1 inch from the wallboard edge and 8inch from focus. For such establishments, 0.00149 inch least thickness stirred steel corner globules with 1-1/2 inch legs will be joined to wallboard with Type S screws divided 12 creeps on focus