Replacement of Roofing Sheets

Removing of all damaged asbestos /PPGI sheets, ridges, hips, MS Pipes ( Mechanical methods like grinding, chiseling, or tool scraper , or thermal methods or plasma cutting) etc., and stacking the material within 50 metres lead of: LS

Steel work in built up tubular ( round, square or rectangular hollow tubes etc.) trusses etc. including cutting, hoisting, fixing in 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 GI Pipe ( Medium Duty) 1. Main Truss 65 mmQ (7x 6.53) 2.Tie 50 mmQ (3.10 x 5.10) 3. King 50 mmQ (1.50 x 5.10) 4. Extension area 65 mm Q (2 x 6.53) 5. Support 25 mmQ( 3 x 1.58) 6. Purlin 40 mm Q (9.5 x 3.65) 7. Shoe Plate 250x 250 x 8 mm (0.05 x 62.80) 8. Bolts & Nuts with washer

Providing and fixing precoated galvanised iron profile sheets (size, shape and pitch of corrugation as approved by Engineer-in-Charge) of total coated thickness 0.50 mm (base metal of minimum 0.45 mm thickness with total coating thickness of 0.05mm) 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 (5.5x 55 mm) 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 and fixing precoated galvanised steel sheet roofing accessories 0.50 mm + 0.05 % total coated thickness, Zinc coating 120gsm 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 m. Ridges plain (500 - 600mm).

Providing valleys of 90 cm wide overall in 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 : 1.60 mm thick with zinc coating not less than 350 gm/m2

Painting with synthetic enamel paint of approved brand and manufacture of required colour to give an even shade: Two or more coats on new work over an under coat of suitable shade with ordinary paint of approved brand and manufacture. For truss pipe LS