8729 Repairs to roof treatment, chajjas and connected works in Technical area at NSTL Visakhapatnam

Taking down existing roof treatment of any description including roof plaster and removing the debris to a distance exc. 500m and depositing out side MD land all as directed.

(a): - M& L for mechanical cleaning of surface to make it free from any bituminous residue /dirt, oil and Greece etc all as specified and directed by GE/Engr-in-Charge. (b) M&L for cracks treatment by cutting open cracks and cleaning it from dirt/loose materials etc and filling with polyurethane based sealant with and including application of PU based primer all as directed by GE/Engr-in-Charge. (c) M&L for applying water based polyurethane modified dispersion (single component, cold applied, non toxic, VOC complaint) in 03 coats including 01 coat of primer of same materials after dilution of water at 50% or specific primer matching same materials and 2nd, 3rd coat consisting 100% of polyurethane material. After 2nd coat, spread non-woven geo-textile of 45 gsm with overlaps of 50mm in both directions when the surface is still stacky as per manufacturer specification and as directed by GE/Engr-in-Charge. Properties of Polyurethane based chemical shall confirm to following Technical Parameters:- (i) Highly Elastic. (ii) UV Resistance. (iii) Adhesion to concrete. (iv) Tensile strength – not less than 2.0 N /Sq.mm for free film. (v) Elongation – not less than 300%. (vi) Solid content by weight- not less than 60% (vii) Air/water permeability BSEN 12390 at 5 bar -72 hours should be NIL and minimum dry film thickness of water proofing membrane must be 1.0 mm. (viii) Accelerated weathering (ASTM453) : Pass 1000 hours. (ix) Reaction to fire – non inflammable.

M&L Screed bed or bedding layer of mortar 15 mm thick for laying floor finishes Cement plaster 1:3 with water proofing compound. WPC shall be measured and paid seperately.

Taking down cement plaster of any description and in any position of brick/concrete surfaces on walls/celing etc. including racking out joints, hacking for key, scrubbing down with water etc & prepared to receive new plaster complete all as specified and directed.

M&L 15 mm thick rendering on stone masonry surfaces or surface other than fair face of brickwork or on one side of lathing finished fair and even without using extra cement in CM 1:4. with water proofing compound. WPC shall be measured and paid seperately.

Supply only Liquid water proofing compound

M&L for applying Two or more coats of 100% Premium acrylic emulsion paint having VOC less than 50 gm/litre and UV resistance as per IS 15489:2004, Alkali & fungal resistance, dirt resistance exterior paint of required shade (Company Depot Tinted) with silicon additives @ 1.43 litre/ 10 sqm over and including priming coat of exterior primer applied @ 0.90 litre/ 10 sqm over new surfacescomplete all as specified and directed.

Dismantling water tanks of any description in any position exceeding 500 & not exceeding 1000 lit capacity complete all as specified and directed.

S&F Rotational moulded polythylene multilayer water storage tanks (cylinderical vertical with closed top) 1000 litres capacity, of any colour hoisted and fixed in position with and including all fittings and fixtures in repairs complete all as specified and directed.

S&F 20mm ball valves high pressure of PTMT with epoxy coated aluminium rod & highdensity plastic ball screwed/fixed to pipes/ferrules complete all as spd.