ADDN/ALTN AND SPL REPAIR OF BLDG NO NP-16, PROVN OF CHEQURED TILES FOOTPATH IN AERIAL PARK AND IMPROVEMENT OF OLD VINTAGE TYPE INTERNAL WIRING AND FITTINGS ETC AT 5N DET BARRACKPORE UNDER GE BARRACKPORE

Surface excavation n.exc 30 cm deep and averaging 15cm deep in soft/loose soil and getting out complete all as specified and as directed.

M & L for Roof treatment of RCC Roof Slab/Parapet Wall over roof in following steps : Surface Preparation: Clean all concrete surfaces free of laitance, dust, dirt, cavities, projecting nibs etc.by grinder and wire brush. Grease should be cleaned using a chemical degreaser and washed with clean water and allowed to dry. Remove all protrusions from concrete surfaces using a fine hair broom finish. Remove moss and lichen manually and treat the surface with a fungicide. Wash the surface thoroughly with clean water and allow it to dry. Standing water must be removed to prevent subsequent compromise of waterproof properties. For undulation of the existing slab shall be rectified with Shrinkage controlled, polymer modified, fibre reinforced cementitious repair mortar Renderoc SP40. Provide and Apply single coat of Lime mortar shall be applied at 1:3 ratio (Lime : sand) admixed with SBR based compound with 5-9 Liters Nitobond SBR Latex for additional layer of waterproofing, repair the covings, pot holes and any unevenness on Lime terrace roof. All around on the roof, at the parapet wall junction, an angular fillet of 50 mm X 50 mm. Free flow precision grout Conbextra GP2 poured within the leak-proof form work in accordance with the mix ratio as recommended in the technical data sheet of the manufacturer and then be sealed with an epoxy putty NITOCOTE VF. The surface is rendered to give aesthetic & visual surface finish complete all as specified and as directed.

Providing and carry out waterproofing treatment to sound, moisture free concrete surface using Nitoproof 600PF - Liquid applied single component pitch free polyurethane coating capable of bridging substrate cracks upto 2 mm. System includes proper surface preparation to remove loose dust, dirt, loose mortar, curing compound etc., and application of Nitoproof WB Primer, Water dispersible epoxy primer followed by two coats of Nitoproof 600PF coverage @ 2.0 kg/m2 to achieve 1.5 mm WFT in two coats followed by laying of separation layer of 120 gsm non-woven geotextile layer before carry out protection screed etc. complete including all tools and tackles as per manufacturer’s specification. Note: (i) Nitocote 600PF cured material shall be having crack bridging of 2 mm, Elongation (ASTMD 412) – 500 - 700 %, Tensile Strength (ASTM D412) – 2.5 N/mm2, Recovery from Elongation (ASTM D412) – 95 %, 85% Solid Content, Tear Resistance (ASTM D624) – 15 Kn/m, Shore A Hardness (ASTM D2240) – 60, Water vapour transmission- 0.6 g/m2/hr, Water Permeability @ 5 Bar (BS EN 12390)-Nil, Service Temperature – -40°C to 70°C, Flash Point > 70 °C, Viscosity-60p, Specific Gravity-1.5. The item rate shall be including of all kinds of labour, tools & tackle, machineries, lead & lift, mathadi charges, curing, wastages, consumable, cleaning, shifting of debris outside the site premises etc. complete as per design, drawing & instructions of EIC. (ii) Cost of 120 gsm non-woven geotextile and 75mm Screed concrete shall be paid separately.

Supply & Laying Geotextiles of 120 Gsm over the waterproofing coating to avoid damage during screed casting. Item rate is inclusive of materials all labour, tools and tackles, scaffolding and transportation etc. complete as per specification and as directed by EIC.

Supply & laying of maximum 25 mm thick (at RW outlet) protective screed/Plaster over the waterproof coating at proportion of 1:2:4 admixed with suitable integral waterproofing compound conforming IS 2645:2003 @ 200ml per bag of cement and reinforced with PP fibres with proper slope towards RW pipes. Green stage saw cutting on the screed will be done in panels (3mt X3mt) with a groove size of 10mm X 15mm. Item rate is inclusive of materials all labour, tools and tackles, scaffolding and transportation etc. complete all as per specified and as directed.

Dismantling wrought iron or mild steel work of any description not otherwise provided for complete all as specified and as directed.

M&L Pre- painted hot dip aluminium Zinc alloy metalic coated trapezoidal profile steel sheet 0.50mm thick ( Total coated thickness), any pattern corresponding to IS 15965 : 2012 of durability class 3, atmospheric classification category 3, coating class AZ 150 of an approved colour having yield strength of 550 Mpa as in roof covering/wall cladding, fixed with self tapping screws complete all as specified and as directed.

S&F Rolled mild steel roof trusses (framed), trussed, purlins, crane gantries, rails and fastenings and heavy bracket framing (Beam, tee, angle, channel or flat sections) including distance pieces, cleats etc. Fe-410-w (Gde-E250) quality A all as specified and directed.

S&F Framed work such as grills, gratings etc., with ends of bars shouldered and/or riveted, or forget into spikes; framed guard bars; barred iron doors; ladders; framed balusters; walk ways; railings; frame work of water tanks and similar work conforming to Fe 290, Gde-E-165 completed all as specified and directed.

M&L for preparation of new steel or iron surfaces of any description over 10cm width or girth and applying two coats of synthetic enamel paints over a coat of red oxide, zinc chrome primer complete all as specified and as directed.