tender for 1. extension of roof : steel work in built up tubular (round, square or rectangular hollow tubes etc.) trusses etc. including cutting, hoisting, fixing, position and applying a priming coat of approved steel primer, including welding and bolted with special shaped washers etc. complete. hot finished welded type tubes , providing and fixing precoated galvanised iron profile trafford sheets (size, shape and pitch of corrugation as approved by engineer-in-charge) 0.35 mm(+0.05%), total coated thickness with zinc coating 120 grams per sqm as per is:277, in 240 mpa steel grade, 5-7 microns epoxy primer on both side of the sheet and polyester top coat 15-18 microns. sheet should have protective guard film of 25 microns minimum to avoid scratches during transportation and should be supplied in single length upto 12 metre or as desired by engineer-in-charge. the sheet shall be fixed using self drilling/self tapping screws of size(5.5x55mm) with epdm seal, complete upto any pitch in horizontal/vertical or curved surface, excluding the coat of purlins, rafters and trusses and including cutting to size and shape wherever required. , painting with synthetic enamel paint of approved brand and manufacture to give an even shade: two or more coats on new work , earth work in excavation by mechanical means (hydraulic excavator)/manual means in foundation trenches or drains (not exceeding 1.5 m in width or 10 sqm on plan), including dressing of sides and ramming of bottoms, lift up to 1.5m, including getting out the excavated soil and disposal of surplus excavated soil as directed, within a lead of 50m. all kinds of soil , providing and laying in position cement concrete of specified grade excluding the cost of centering and shuttering - all work up to plinth level: 1:2:4(cement : 2 coarse sand (zone-iii) derived from natural sources: 4 graded stone aggregate 20 mm nominal size derived from natural sources) , 2. drainage and rain water arrangements: earth work excavation b