Providing waterproofing treatment over terraces, Structural Repairs with Epoxy System , ACP cladding, and miscellaneous civil works in Engineering Hall-1 to 6 and other buildings Hill side Buildings at North Site, BARC, Trombay, Mumbai.

Dismantling roofing including ridges, valleys and gutter etc and stacking the material within 50 m lead G.S Sheet / FRP Sheet / AC Sheet

Dismantling steel work in single sections including dismantling and stacking within 100 m lead In R.S Joists, Angles etc.

Removing bitumen based waterproofing treatment from terrace chajjas, parapets etc, and disposal within 50m. Note : All surfaces shall be made free from gross irregularities, loose, unsound or foreign material such as dirt,water, grease, oil, release agents, lacquers, or any other condition that would be detrimental to adhesion of the primer and membrane. This requires careful preparation of existing horizontal and vertical substrates; cracks are filled, expansion joints,flashings(if any) are prepared. Substrates and penetrations shall be prepared to rigorous industry standards, and may require scarifying, sandblasting or grinding in some cases to achieve a suitable substrate and the cost of the above work shall be deemed to be included in the quoted rate.

Roughening thoroughly entire surface area and removal of damaged/ spalled surface carefully up to the bare surface using sandars/ electricaly operated angle grinders/ wire brushes etc. complete and drying the surface by hot air blowers near damp areas if required complete all as per specifications, drawings and as directed by the Engineer in charge.

Providing and applying polymer RBR cement slurry in Ratio of 1:1.5 as Bond coat on the cleaned area and laying 25-32 mm thick Cement mortar (1Kg Cement:1.75kg River sand:0.75 kg Silica sand and 200 ml Polymer) mixed with approved waterproofing compound, finish smooth with cement slurry, making the finish smooth with cement slurry, marking the finished surface with pattern as matching the old finishes etc. including cost of all materials, labour, machinery, tools & tackles and consumables all complete as per specifications and as directed by Engineer-in-charge.

Pre-mixed Polymer Modified Mortar (PMM) repair: Structural repairs works with pre-packed dual shrinkage controlled (volume stable in wet & hardened state), single-component ready-to-use, structural grade high build, alkali-resistant, fibre-reinforced, thixotropic polymer modified repair mortar having excellent bond strength to old damaged concrete structures / surfaces by the following process: 1) Removal of loose/spalled or damaged concrete by chipping and cleaning the concrete surface to open up to 20mm behind the reinforcement steel with wire brush and with clean water including removal of dirt, paint, wax, oil, grease, laitance, foreign substances, etc.Mechanically profile and repare concrete surfaces by abrasive blasting, waterjetting or other engineer approved methods 2) Cleaning the rebars with Acetone for complete rust removal and washing with water to make the surface clean. Ensure that the concrete substrate and ambient temperatures are between (10°C and 35°C) before application 3) Applying protective coat / bond coat using Styrene Butadiene Rubber (SBR) polymer and cement in the proportion of 1: 1 (1 part of polymer : 1 parts of cement). 4) Mixing full 25 Kg bag with clean potable water in water to product ratio of 0.12 to 0.18), mixed by heavy?duty slow speed (300 to 600 rpm) drill with spiral mixing paddle or forced action pan mixer pan for 3 minutes to achieve uniform lump free mortar consistency. 5) Applying polymer modified mortar with trowel & float. The polymer modified mortar shall have the following properties/technical parameters: A) Properties / technical parameters of pre-packed Polymer Modified Mortar: i)Compressive strength 1 day: Min. 20 MPa (as per BS:6319 : Part 2) ii)Compressive strength 7 days: Min. 35 MPa (as per BS:6319 : Part 2) iii) Compressive strength 28 days: Min. 45 MPa (as per BS:6319 : Part 2) iv) Flexural strength in 28 days: Min. 7 Mpa (as per BS:6319 : Part 3) v) Tensile strength in 28 days: Min. 2.5 MPa (as per BS:6319 : Part 7) vi) Bond strength: Min. 5 MPa (as per ASTM : C881) vii) Water permeability: less than 1% (as per ASTM : C881) viii) Drying shrinkage in 28 days: less than 1000 microstrain (as per ASTM C 157-93) ix)Potential Alkali Reactivity - : <0.1% Expansion % ( ASTM C1260) B) Properties / technical parameters of SBR polymer bond coat material: i) Meets the requirements of BS 6319 part 2:1983 & ASTM C 190-85 standards ii) Total solids % by mass at 105oC: 38 + 1 iii) pH value: 7.5 to 9.5 iv) Specific gravity at 27.5oC: 1 to 1.05 v) Coverage: 4.2 - 4.5 sq.m/kg per coat Notes:- (a)Placing and finishing the same with trowel / hand packing carefully compacting the same around the rebars and finishing to bring it in line with existing concrete surface on the beams, slabs, columns, etc. (b) If thickness of repair exceeds 20mm , after every 20 mm thick repair, bond coat as per process no. (3) mentioned above in the BOQ item, to be applied and further thickness of repair to be continued for each layer. (c) The surface preparation & method of application shall be as per manufacturer's technical data sheet. (d) The double tubular steel scaffolding will be paid separately in relevant item. (e) Sampling and testing of cube specimen for compressive strength test shall be as per BS 6319 - Part-2.Other tests mentioned above shall be carried out if required as per the direction of the EIC and the cost of which shall be deemed to be included in the quoted rate (f) For each batch of mortar mixed, following records, i.e Quantity of mortar (kg) mixed, Amount of water added to the mix, Location of application and the area covered.(g) Payment will be paid on the basis of actual consumption of PMM & Reinforcement will be paid in the relevant item. (h) Curing like mist spraying the surface with water or using damp burlap or hessain cloth shall be done. Replacement of old rebars in case of reduction in diametre shall be done in consultation with EIC before applying repair mortar. (i) Safety Precuations:- Use wear tight-fitting, dust-resistant, chemical splash goggles and dust respirator, if airborne dust is generated, wear protective rubber hand gloves, wear appropriate clothing to prevent any possibility of skin contact. The above item of work is inclusive of all materials, labour, machinery, tools & tackels, consumables, trasportation, loading & unloading, safety PPEs etc. all complete as directed by Engineer-in-charge at site using approved pre-packed polymer modified mortar suitable for structural repair works.

Providing and applying cold liquid Polyurethane waterproofing system on Horizontal surfaces including coving (if any) having following layers: (a) Primer / base coat: Providing and applying (Pre-Measured Packed) silver grey coloured 2 (two) component solvent free, odourless, Epoxy-based Primer with excellent adhesive property on the clean and grinded surface/substrate. The substrate can be slightly moist (in concrete, the moisture must be less than 20 %), sound and free from any material that would hinder good adhesion. Mix component 'A' into component 'B' in ratio of 1: 0.16 by weight thoroughly with a clean stirring stick. The mixture should be of uniform colour & free from streaks and be applied evenly with roller. The primer should be completely dry for further application of liquid applied polyurethane based membrane/ coating. The consumption, depending on the nature and condition of the substrate for priming, should be within the range of 250 – 400 gm/sq.m. The rate shall include cost of all material, labour, tools & plants, consumables etc. complete all as directed by EIC. (b) Top coat: Providing and applying cold liquid applied waterproofing based on highly flexible solvent free single component Polyurethane system and special needle punched non-woven, system compatible polyester fleece of minimum 120 GSM as reinforcement. The cold liquid applied reinforced system shall have high crack bridging property and shall be UV stable, solvent-free, Cool Roof system. Application procedure: (i) Stir the material well before use. (ii) 2/3rd of the waterproofing mix material to be applied on the primed substrate and the special polyester fleece of min. 120 gsm to be rolled with roller including removal of air bubbles with an overlap of min. 5 cm. (iii) The remaining 1/3rd of the waterproofing material to be poured onto the surface until complete saturation is achieved. The layers should be applied on wet surface of earlier coat and there should not be any time lag during the laying of the system. (iv) After curing, one coat of material approx. 300g/sq.m. to be applied after 24 hours. (v) The total system of waterproofing for material and components shall be procured from single manufacturer. (vi) The total thickness achieved from the application should be from 1.4 to 1.7 mm. (vii) The total consumption of mix waterproofing depending on the nature, porosity and condition of the substrate should be in the range of 2.3 to 2.7 kg/sq.m. The rate shall include cost of all material, labour, tools & plants, consumables etc. complete all as directed by EIC. Specifications/Technical Parameters: The tensile strength of the membrane shall be min. 8.60 N/sq.mm and Elongation at break with fleece shall be min. 83.0 % (with fleece). The Tear Resistance of the membrane shall be min. 41.0 N/mm, Solar Reflection Index (SRI) Value of membrane shall be min. 100, Degree of solar reflectance of the membrane shall be min. 85% and adhesive strength shall be min. 2.40 N/sq.mm. etc. Note: The contractor shall provide min. 10 (ten) years Leak Proof Performance warranty for the complete waterproofing work.

Providing and applying cold liquid Polyurethane waterproofing system on Vertical surfaces above coving (if any) having following layers: (a) Primer / base coat: Providing and applying (Pre-Measured Packed) silver grey coloured 2 (two) components solvent free, odourless, Epoxy-based Primer with excellent adhesive property on the clean and grinded surface/substrate. The substrate can be slightly moist (in concrete, the moisture must be less than 20 %), sound and free from any material that would hinder good adhesion. Mix component 'A' into component 'B' in ratio of 1: 0.16 by weight thoroughly with a clean stirring stick. The mixture should be of uniform colour & free from streaks and be applied evenly with roller. The primer should be completely dry for further application of liquid applied polyurethane based membrane/ coating. The consumption, depending on the nature and condition of the substrate for priming, should be within the range of 250 – 400 gm/sq.m. The rate shall include cost of all material, labour, tools & plants, consumables etc. complete all as directed by EIC. (b) Top coat: Providing and applying cold liquid applied waterproofing based on highly flexible solvent free single component Polyurethane system. The cold liquid applied reinforced system shall have high crack bridging property and shall be UV stable, solvent-free, Cool Roof system. Application procedure: (i) Stir the material well before use. (ii) 50% of the waterproofing mix material to be applied on the primed substrate with roller including removal of air bubbles with an overlap of min. 5 cm and until complete saturation is achieved. (iii) After curing, balance 50% of material to be applied after 24 hours. (iv) The total system of waterproofing for material and components shall be procured from single manufacturer. (v) The total thickness achieved from the application should be from 0.47 to 0.57 mm. (vi) The total consumption of mix waterproofing depending on the nature, porosity and condition of the substrate should be in the range of 0.77 to 0.80 kg/sq.m. The rate shall include cost of all material, labour, tools & plants, consumables etc. complete all as directed by EIC. Specifications/Technical Parameters: The tensile strength of the membrane shall be min. 8.60 N/sq.mm and Elongation at break with fleece shall be min. 83.0 % (with fleece). The Tear Resistance of the membrane shall be min. 41.0 N/mm, Solar Reflection Index (SRI) Value of membrane shall be min. 100, Degree of solar reflectance of the membrane shall be min. 85% and adhesive strength shall be min. 2.40 N/sq.mm. etc. Note: The contractor shall provide min. 10 (ten) years Leak Proof Performance warranty for the complete waterproofing work.

Designing, providing and fixing of 4 mm thick approved make and shade Aluminium Composite Metal Panel of approved make cladding at different locations including soffits of over-hangs but excluding aluminium frame work with grids filled in with weather silicon sealant as per the drawings. The ACM panel composition shall be of 0.5 mm thick PVDF coated aluminium sheet + 3 mm thick low density polyethelene virgin resin core + 0.5 mm thick polyester (PVDF) coated Aluminium sheet all complete as per approved shop drawings and specification (Aluminium frame work will be paid under reelevant item) Note : ACMP shall be measured to the actual visible area of the ACP sheet including silicon joints as fixed on site.