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| 1 | Dismantle/ Removal of existing APP/Tarfelt Sheet waterproofing with base coat at all heights and collecting, lowering to ground, transporting and disposing off the debris at designated places up to a lead of 2 km. and spreading it etc., as directed by engineer. The item includes completely removing and scrapping of all old APP/Tarfelt/Bitumen layer etc. from the roof including removing of all loose debris and roughening the surface to accept plaster, all complete to the satisfaction of engineer. |
| 2 | Dismantling tile work in floors and roofs laid in cement mortar including stacking material within 100m lead for thickness of tiles above 10mm and up to 25mm including disposal of debris. |
| 3 | Providing and laying cement concrete of 1:2:4 ( 1 Cement : 2 Coarse sand : 4 graded stone aggregate 20 mm nominal size) in retaining walls, return walls, walls(any thickness) including attached pilasters, columns, piers, abutments, pillars, posts, struts, buttresses, string or lacing courses, parapets, coping, bed block, anchor block, window sills, fillets, roofs etc. at all level including transporting of concrete to site, laying including cost of finishing, curing etc. all complete including the cost of centering and shuttering as per specifications and direction of Engineer-in-charge. |
| 4 | Supplying and applying 20 to 25 mm thick cement mortar in average thickness 20 to 25 mm on roof slab,finishedsmooth ofcementmix 1:4 (1 cement : 4 fine sand) mixed with approved waterproofingcompound (as per table-3 of Section-V) as recommended by the manufacturer including finishing, curing, scaffolding, etc. complete as per direction of Engineer. |
| 5 | Identification of leakage points, drilling holes by machine, cleaning the same, providing and fixing GI pipe nozzles (8 to 12 mm dia, 40 to 100 mm long) with stop cock, dry packing the drilled hole with required material including all tools and tackles, Scaffolding- erection / dismantling & removing the nozzles after use, finishing for making good the surfaces, etc complete as directed by Engineer-in-charge. |
| 6 | Providing and injecting approved grout in proportion recommended by the manufacturer into cracks/honey-comb area of concrete/masonry by suitable gun/pump at required pressure including cutting of nipples after curing etc. complete as per directions of Engineer-inCharge. (The payment shall be made on the basis of actual weight of approved grout injected.) : Epoxy injection grout in concrete/RCC work of approved make |
| 7 | Providing and injecting approved grout in proportion recommended by the manufacturer into cracks/honey-comb area of concrete/masonry by suitable gun/pump at required pressure including cutting of nipples after curing etc. complete as per directions of Engineer-inCharge. (The payment shall be made on the basis of actual weight of approved grout injected.) : Poly urethane / Expansion aqua chemical grouting compound POLYGROUT CONBEXRTA WS 60 or equivalent of approved make |
| 8 | Cutting V-grooves on RCC construction joints of size upto max. 25mm width by mechanical grinder / chiselling,cleaning the groove and dry packing the same with 1 : 1 cement-sand mortar admixed with approved Water-proofing compound to prevent / stop the leakage path and finishing the same including erection and shifting of scaffolding at various locations and heights, including cleaning the area after work, disposing the debris at desired location etc. all complete as directed by the engineer. This item includes removal of foam concrete to trace the construction joint/cracks and sealing them. |
| 9 | Providing and fixing in position 25 mm thick bitumen impregnated fibre board conforming to IS: 1838, including cost of primer, sealing compound Grade-A in expansion joints |
| 10 | Providing and fixing aluminium sheets of 22-24 gauge (SWG) over expansion joints including drilling holes , fixing wooden gitties/ PVC anchors, self threading screws etc., with all necessary tools, tackles etc. all complete as directed by Engineer. |
| 11 | Providing and applying fibre reinforced elastomeric liquid water proofing membrane with resilient acrylic polymers having Sun Reflectivity Index (SRI) of 105 on top of concrete roof in three coats @10.76 litre/ 10 sqm. One coat of self-priming of elastomeric waterproofing liquid (dilution with water in the ratio of 3:1) and two coats of undiluted elastomeric waterproofing liquid (dry film thickness of complete application/system not less than 500 microns). The operation shall be carried out after scrapping and properly cleaning the surface to remove loose particles with wire brushes, complete in all respect as per the direction of Engineer-in-Charge. |
| 12 | Providing and laying APP (Atactic Polypropylene Polymer) modified prefabricated five layer 3 mm thick water proofing membrane, black finished reinforced with non-woven polyester matt consisting of a coat of bitumen primer for bitumen membrane @ 0.40 litre/sqm by thesame membrane manufacture of density at 25°C, 0.87-0.89 kg/ litre and viscocity 70-160 cps. Over the primer coat the layer of membrane shall be laid using Butane Torch and sealing all joints etc, and preparing the surface complete. The vital physical and chemical parameters of the membrane shall be as under : Joint strength in longitudinal and transverse direction at 23°C as 650/450N/5cm. Tear strength in longitudinal and transverse direction as 300/250N. Softening point of membrane not less than 150°C. Cold flexibility shall be upto -2°C when tested in accordance with ASTM, D - 5147. The laying of membrane shall be got done through the authorised applicator of the manufacturer of membrane : 3mm thick. Note:All the required material shall be as per Table-3 of Technical Specifications. |
| 13 | Extra for covering top of membrane with Geotextile, 120 gsm non woven, 100% polyester of thickness 1 to 1.25 mm bonded to the membrane with intermittent touch by heating the membrane by Butane Torch as per manufactures recommendation. |
| 14 | Supplying and applying one coat of anticorrisive, water proofing bituminous paint with aluminum finish on old / new roof surfaces as per manufacturers specifications and as directed by engineer. Special Note: Quantities of paint minimum 10% in excess of that computed for the application area in line with specified coverage indicated under authenticated manufacturer\"s data sheet shall be procured by the contractor and deposited in NPCIL stores for issue on daily basis by the engineer for application. |
| 15 | 1st Coat |
| 16 | 2nd Coat |
| 17 | Providing and fixing Roof Water Down Comers (RWDCs) of all sizes (75 to 300mm) of M.S. pipe/plate fabricated by cutting, grinding, welding etc. and clamping the same on the brickwork/ Concrete wall, testing for leakage if any and making it water tight, etc. all complete as per drawings, specifications & direction of engineer.Note: The work includes repairing / replacement of existing RWDCs |
| 18 | Painting Two coats on rain water, soil, waste and vent pipes and fittings with black anticorrosive bitumastic paint of approved brand and manufacture over and including a priming coat of ready mixed zinc chromate yellow primer on new work of all diameter pipes after cleaning / scrubbing of surfaces with wire brushes, soft brushes & sand papers including cost of materials, labour, cleaning of area after painting etc, complete as per direction of Engineer. |
