tender for roof treatment of non residential buildings at no 2 mgar (e), silchar - demolishing cement concrete manually by mechnical means including disposal of material within 50 meters lead nominal concrete 1:4:8 or leaner mix (i/c equivalent design mix) as per direction of engineer-in-charge. 2 grading roof for water proofing treatment with cement concrete 1:2:4 (1 cement:2 coarse sand : 4 graded stone aggregate 20mm nominal size) 3 providing and laying in situ seven course water proofing treatment with app (atactic poly-propylene) modified polymeric memberane over roof consisting of first coat of bitumen primer @ 0.40 litre per sqm, 2nd, 4th & 6th courses of bonding meterial @ 1.20 kg/sqm, which shall consist of blown type bitumen of grade 85/25 conforming to is : 702, 3rd and 5th layers of roofing membrane app modified polymeric membrane 1.5mm thick of 2.25 kg/sqm weight consisting of five layers prefabricated with centre core as 20 micron hmhdpe film sandwiched on both sides with polymeric mix and the polymeric mixis protected on both side with 20 micron hmhdpe film. 7th, the top most layer shall be finished with brick tiles of class designation 10 grouted with cement mortar 1:3 (1 cement : 3 fine sand) mixed with 2% integral water proofing compound by weight of cement over a 12 mm layer of cement mortar 1:3 (1 cement: 3 fine sand) and finished neat (item of laying brick tiles shall be paid for separately).