REPAIRS TO ROOF TREATMENT IN CERTAIN BUILDINGS IN TECHNICAL AREA AT NPOL KOCHI

Amount

Taking up or down steel tubing and connections, including cleaning for refixing or removal to store bore dia of tube

S&F Unplasticised PVC pipes of pipe bore 25mm of pressure rating 10 kgf/cm2fixed complete to walls, ceilings or in floors etc., any type

Disconnecting existingtanks, setting aside (orlowering if required) forrepairs, cleaning, etc. andhoisting if requiredreconnecting and re-fixing inposition. (Cleaningrepairing, etc. measuredseparately) Capacity exceeding 250 l but not exced 500 litre

Disconnecting existing tanks, setting aside (or lowering if required) for repairs, cleaning, etc. and hoisting if required reconnecting and re-fixing in position. (Cleaning repairing, etc. measured separately) Capacity exceed 500l but not exceeding 1000 litre

M&L PVC (SWR) pipes 110mm dia single socketed, in any length with rubber ring joints, laid in trenches or in floors

M&L PVC (SWR) bends any radius 110mm dia

Taking down existing water proofing treatment of any thickness from the roof /parapet including cement mortar bedding, PCC tiles, padding concrete if any, upto the RCC slab, incl washing and scrubbing removing debris off the premises and cleaning the roof complete all as specified

Cutting the V grooves on the terrace slab where ever cracks are observed and fill the grooves with Fosrocs heavy duty non shrink grout Convextra GP2 , coving all the 90 degree angles , slab/wall junctions with Conbextra GP2 all as per manufacturer's instruction.

M&L providing a leveling course of cement concrete Type B-0, 1:2:4, using 12.50 mm stone aggregate, 40 mm thick maintains a slope towards the drain water pipes by adding a water proof admixture @ 250 ml per bag of cement. Note :-Admixture shall be measured and paid separately.

M&L for rendering with CM 1:3, 10 mm thick mixed with water proofing admixture of approved make, all as specified and directed. Note :-Admixture shall be measured and paid separately.

Supply only liquid water proofing admixture.

M&L for Poly Urethane based water proofing treatment to existing RCC roof slab with the following specifications. i) Cleaning the existing surface by mechanical means to make it free from any bituminous residue/dirt, oil and grease all as directed by Engineer In Charge. ii) M&L for cracks treatment by cutting open cracks and cleaning it from dirts, loose materials etc and filling with Polyurethane based sealant with and including application of PU based primer all as directed by Engineer In Charge.

iii)M&L applying water based polyurethane modified dispersion (single component, cold applied, non toxic VOC compound) in three coats including one coat of primer of same material after dilution of water at 50% or specific primer matching same material as per manufacturer specification and as directed by Engineer In Charge. Note:- Properties of Poly urethane based chemical shall conform to following technical parameters a)Highly elastic b) UV resistance c)Adhesion to concrete > 1N/ Sqmm d)Tensile strength-not less than 2.0 N/Sqmm for free film e) Elongation not less than 300% f) Solid content by weight not less than 60% g)Air/Water permeability BSEN 12390 at 5 bar -72 hours should be NIL and minimum dry film thickness of water proofing membrane must be 1.00mm h)Accelerated weathering(ASTM 453) Pass 1000 hours

j) Reaction to fire - Non inflammable k) To be applied by the rep of manufacture’s authorised applicator only. Contractor has to provide manufacture’s test certificate for the above mentioned Technical parameters and purchase vouchers. m)Removal of existing treatment to be paid separately n)Roof slop to be ensured to avoid water ponding/logging p) 300mm height of vertical surface/parapet wall to be treated with the same specification .Make:-Berger,Fosroc, Sika, Asian, STP or any other make approved by E-In -C's branch

ZOOM ENTERPRISES (BID ID -3261342)

Johnson Raiju (BID ID -3256879)

PARAMBIL ENTERPRISES (BID ID -3262217)