SPECIAL REPAIRS TO ROOF TREATMENT OF CERTAIN BUILDINGS AT HQ SAC (U).

Amount

Dismantling single layer mangalore pattern or similar tiles in roofing incl ridge tiles complete all as specified and directed.

M&L for Roof tiles Mangalore pattern inter locking at side joints, and fixed on screed bed in CM 1:4 with 3kg of cement slurry per Sqm area complete all as specified and directed.

All as per item above above but except tiles all as specified and directed.

Taking down cement plaster including existing roof treatment or fillets on roof surfaces and wall surfaces complete, racking out joints, hacking for key scrubbing down with water etc and removing rubbish to a distance exc 250m and not exc 500m, complete all as specified and as directed.

Demolition of cement concrete in roofs, floors (other than ground floor), beams, staircases, landing and similar suspended work, and throwing away the debris not exceeding 1km complete all as specified and as directed.

M&L for 15 mm thick rendering in cement mortar 1:4 on fair surfaces of brick masonry or concrete surface, finished the surface even and smooth with using extra cement incl using WPC as per manufacturers instructions, complete all as specified and directed. Note : WPC shall be measured and paid separately.

Supply only liquid waterproofing compound (ISI grade only)

M&L PCC 1:2:4 type B0 using 12.5mm graded stone aggregate as in padding concrete for roof, plinth courses, copings, string courses, water troughs and the like finished even and smooth including necessary formwork, weathering, slightly rounded or chamfered angles and throating complete all as directed.

M&L PCC 1:3:6 type C1 using 20mm graded stone aggregate as in tank staging concrete including necessary forwork for sides complete all as specified and as directed.

Demolition of cement concrete(reinforced) exc 15cm thickness but above ground floors (Reinforcement cut as required to facilitate the demolition)as specified and directed.

M&L for double scaffolding(without disturbing the existing wall) for removing the Mangalore pattern tiles on roof/Parapets for Plastering and finishing the work of outer periphery of the building complete all as specified and directed Note : (i)The building considered in this item is G+2 storey and above (ii) Scaffolding will be measured only one time and one face for particular place of work in all respect like Dismantling, Plastering,Painting, Roof treatment and complete finishes etc

M&L for applying two component, cold(brush/roller) applied, UV resistant hybrid Polyurethane waterproof coating on existing roof screed/plaster surface including equipments and supervision charges in following step by (i) Roof substrate must be pressure-washed with water with, a minimum working pressure of 1,400 psi is to be used to remove all dirt, dust, chalking and waste products, complying with standard specification and as directed by the Engineer-in-Charge.

(ii) Inspect for cracks over roof screed, roof wall junction, water drain inlets/outlets if any, and clean and moisten them. Crack’s width should be wide up to 5-6 mm with mechanical cutting machine and Apply bond coat of SBR Latex in the ratio of 1:1 (URP 1: Cement 1) followed by groove should be filled with PMM by preparing Polymer modified mortar of CM 1:1 (Silica sand size ≤ 300microns) admixed with SBR Latex at a dosage of 15% of cement.

(iii) Providing 300mm x 300 mm Square / rectangle upstand of M20 grade concrete or with PMM around mechanical equipment like HVAC, airconditioning, solar panels. Etc. Apply a coat of two component, cold(brush/roller) applied, UV resistant hybrid Polyurethane waterproof coating allow to cure for 3-4 hours and followed by apply two coats two component, cold(brush/roller) applied, UV resistant hybrid Polyurethane waterproof coating reinforced with 45 Gsm glass fiber mesh or geo textile without dilution in the interval of 4 -6 hrs. Apply Hybrid PU Sealant at around the junction of fabricated stand inserted and wall mounting mechanical fixtures.

(iv) Providing Minimum 50mm thick angle fillet with CM of 1:3 admixed with SBR Latex at a dosage of 12-15% of Cement and a bond coat of SBR Latex mixed with Cement at a ratio of 1:1.(v) Premix hybrid Polyurethane waterproof coating components A and B with an electric double paddle mixer stirrer for 2-3 minutes at a slow speed. The concrete surface must be brought into surface saturated dry condition (SSD). Providing and apply first coat of two component, cold(brush/roller) applied, UV resistant hybrid Polyurethane waterproof coating to the existing screed/plaster at a rate of 0.5Kg/sq.mt/coat. Place a 45-GSM glass fiber mesh or 200- 225 GSM raw mesh between the first and second coats while the first coat is still wet. Allow the first coat to dry for 3-4 hours. Apply the second and third coats of two component, cold(brush/roller) applied, UV resistant hybrid Polyurethane waterproof coating with the same application coverage, but in a direction perpendicular to that of the first and second coats. Allow each coat to air cure for a minimum of 3-4 hours after application. Ensure that no void surface is left untreated or uncoated. All coats should be applied in directions perpendicular to each other, ensuring the correct consumption of material, resulting in a total dry film thickness of 1000 microns with system coverage in three undiluted coats at a rate of 1.50 Kg/ sq.mt/coat. Allow the system to air cure for 5-7 days minimum.

The material should conform to the specified technical properties: a) Tensile Strength with Fiber ≥9N/mm2 as per ASTM D 2370 b) Elongation at break ≥ 200% as per ASTM D 2370 c) Crack bridging ability ≥ 3mm as per EN 1062-7-2004(A) d) solid content ≥55% as per ASTM D 1,644-2001 e) Abrasion resistance 15mg confirming to ASTM D 4060 f) Shore-A 65 as per ASTM D2240 g) Tear Resistance with Fiber 40N/mm as per ASTM D 624. The waterproofing coating shall be applied over the entire horizontal surface and extended onto the vertical surface of the parapet wall, as per the manufacturer methodology as directed by GE/Engineer-in-Charge. Note: All waterproofing work suggested above shall be carried out by the in house application wing of the manufactuer or skilled waterproofing contractor under the guidance of a technical expert from the manufacturer. The technical expert should audit the quality of the waterproofing work and submit the report. The Make/ brand specified in the BOQ for guidance equivalenr approved make brand can also be used in the work No monopoly is permitted

M&L for provn of water proofing roof treatment to accessible/non-accessible RCC roof APP based polymeric membrane including dimantling of old APP membrane. The APP membrane should be minimum weighing 3kg/sqm and minimum 3mm thick having thermal insulation with white mineral/gravel finish on upper side of membrane uniformely embedded during manufacturing process. The rate is inclusive of dismantling of old APP membrane. The new membrane shall be laid down as per follwing specifications :-

(a) The surface of the roof, parapet and gutters, drain mouths etc over which water proofing treatment is to be applied shall be cleaned of all foreign matters such as fungus, mass, dust etc by wire brushing and dusting. For cast iron drain outlets the groove shall be cut around to tuck in the treatment as pipes, chimney stacs etc and other similar situations to ease up about corners.

(b) Bituminous primer conforming to IS : 3384-1965 oil bound bituminous primer @ 0.20 Kg per sqm and applying a coat blown grade hot bitumen 85/25 or 90/15 @ 1.20 Kg/sqm to be applied on prepared surface till the surface is properly impregnated.

(c) APP modified water proofing membrane as specified shall be laid on the primer surface by torch application method as per manufacturer instructions. The overlaps while torching shall be 100mm in both directions (longitudenal and transverse directions). All overlap joints shall be sealed throughly by thermofusing both the membrane layers and sealing it with the help of hot trowel. The overlap joints shall be made as monolithic layer.

(d) All joints & changes in direction should be curved with cement mortar 1:3 mixed with SBR latex @ 200ml per bag of cement and cured well before laying the membrane.

(e) Apply one coat of solar reflective bituminous aluminium paint @ 100 gm per sqm over a coat of aluminium red oxide primer on the APP membrane, complete all as specified and directed by Engr-in-Charge.

Disconnecting existing tanks, exc 500 & n.exc 1000 ltr capacity, setting aside (or lowering if required) for repairs, Cleaning and removing all scale and dirt, etc, from tanks and from mouths of circulating pipes, etc, and hoisting if required reconnecting and re-fixing in position as specified and directed.

Dismantling existing water tanks and placed in a suitable position on roof and provide temporary connection of water for users to facilitate water proofing work on platforms of water tanks. After roof treatment the temporary water connection shall be removed and dismantle the water tanks from its position, remove the tank and connected items from the premises as specified and directed.

S&F rotational moulded polythene water storage tank (Cylinderical vertical with close top) hoisted and fixed in position all as specified in repairs 750 ltrs capacity including all necessary items as specified and directed.

S&F rotational moulded polythene water storage tank (Cylinderical vertical with close top) hoisted and fixed in position all as specified in repairs 1000 ltrs capacity including all necessary items as specified and directed.

S&F in repairs 25mm dia Ball valves high pressure of PTMT with epoxy coated Aluminium rod & highdensity plastic ball screwed for iron pipe and fixed complete all as specified and directed.

S&F in repairs gun-metal, globe or gate valves, with iron wheel head, screwed both ends for iron/UPVC pipe of 32mm dia bore and fixed, complete all as specified and directed.

Taking up or down 25/32mm bore steel tubing and connections, including cleaning for refixing, complete all as specified and directed.

S&F 32 mm bore pipe (LEAD FREE), Unplasticised PVC/UPVC(ASTM) pipes of pressure rating 10 kgf/cm2 fixed, complete to walls, ceilings or in floors etc., as specified and directed.

Taking up or down 20mm bore steel tubing and connections, including cleaning for refixing, complete all as specified and directed.

S&F 20mm bore pipe (LEAD FREE), Unplasticised PVC/UPVC(ASTM) pipes of pressure rating 10 kgf/cm2, fixed complete to walls, ceilings or in floors etc., as specified and directed.

DEFT GROUP ELECTROMECHANICAL (BID ID -3478272)

Archana Transport (BID ID -3478727)

Powertech Engineers (BID ID -3477124)