Replacing existing Asbestos Roofing Sheet of Generation Sub Division, Thenmala with PUF sheets at Kallada Hydro Electric Project, Thenmala, Kollam-691308

Dismantling works

Dismantling roofing including ridges, hips, velleys and gutters etc., and stacking the material within 50 metres lead of :Asbestos Sheet

Strengthening of existing roof structure for providing PUF sheet

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 bolts including nuts and washers complete.

providing new PUF roofing sheet

Providing and fixing 30mm thick Poly Urethelene Form insulated Sandwitch roofing panels with precoated galvanised iron profile sheets (size, shape and pitch of corrugation as approved by Engineer-in-charge) 0.35 mm at top and 0.30mm thick at bottom. 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 surfaces, excluding the cost of purlins, rafters and trusses and including cutting to size and shape wherever required

Providing ridges or hips width 60 cm overall width plain G.S. sheet fixed with polymer coated J or L hooks, bolts and nuts 8 mm dia G.I. limpet and bitumen washers complete.0.63 mm thick with zinc coating not less than 275 gm/m2

Repair and finishing works

Repairs to plaster of thickness 12 mm to 20 mm in patches of area 2.5 sq meters and under, including cutting the patch in proper shape, raking out joints and preparing and plastering the surface of the walls complete, including disposal of rubbish to the dumping ground within 50 meters lead:With cement mortar 1:4 ( 1 cement : fine sand)

Applying one coat of water thinnable cement primer of approved brand and manufacture on wall surface:Water thinnable cement primer

Finishing with Deluxe Multi surface paint system for interiors and exteriors using primer as per manufacturers specifications:Painting Steel work with Deluxe Multi Surface Paint to give an even shade. Two or more coat applied @ 0.90 ltr/10 sqm over an under coat of primer applied @ 0.80 ltr/10 sqm of approved brand and manufacture

Painting with silicon & acrylic emulsion-based water thinnable sealer of approved brand and manufacture on wet or patchy portion of plastered surfaces:One coat

Painting with synthetic enamel paint of approved brand and manufacture to give an even shade:Two or more coats on new work