SPECIAL REPAIR TO ROOF TREATMENT AT VARIOUS LOCATIONS IN DOMESTIC AREA AT AFS TEZPUR

M&L for providing the roof water proofing treatment in following steps: - (a) Removing of existing APP membrane on the substrate with using torch machine & heating and mechanicals tools for hacking the surfaces all as specified and directed. (b) Chipping & cleaning of surfaces with the help of wire brush, wash the roof with clean water & remove all loose concrete, grease, oil using wire brush and scrubber all as specified and directed. (c) Providing, mixing and applying polymer modified bond coat of Dr Fixit, pidicrete URP mix in the ration of 1:1 (URP 1 : Cement 1) by volume to make it lump free slurry when applied on the pre wet surface apply a single coat all as specified and directed. (d) Providing mixing and applying Dr Fixit pidicrete URP (301) SBR polymer (Styrene-Butadiene Rubber latex) (@ minimum 2% wt of cement used) modified cement concrete for structural members with ratio 1:2:3 (ordinary portland cement, coarse sand and graded stone aggregate of 10mm maximum size with 25mm average thickness and finished the top surface without using extra cement all as specified and directed.

Item 1.00 Contd.... (e) Apply one coat of self primer 1 liter of Dr Fixit Roof seal classic (based on acrylate PU Hybrid Elastomeric emulsion technology reinforced with Nano fibers) diluted with 500 ml water in the ration 2:1 spreading at the rate of 0.80-10 /Sqm/Litre in the SSD (Saturate Surface Dry) condition. After 3 hours of primer application, apply 1st coat of Dr Fixit roof seal classic without dilution spreading at the reate of 0.500/Liter/Sqm/Coat until all surface is covered. Allow the first coat to dry for approximately 4-6 hours before applying the 2nd coat at 90 degree to the first coat. Ensure there are no pinholes or air bubbles of the membrane surface. Apply secound coat of Dr Fixit roof seal classic without dilution spreading at the rate of 0.5 liter/Sqm/coat to achieve total dry film thickness of 1.00 mm at forced coverage at the rate of 1.00 litre/sqm in 2 coats meet the exceeds the ASTM D 6083-97a standard specification. Attains a Tensile strength of >2.1 N/sqmm with 45 GSM glass fiber mesh confirming to ASM D 412, Elongation at break > 300% and crack bridging ability upto 2mm., solar reflectance index as per ASTM E 1980-106, Air cure the coating for 7 day all as specified and directed. Note : (a) Work shall be carried out through manufacturer authorised applicator & contractor to submit MTC and test certificates alongwith gaurantee certificate from manufacturers. (b) Work shall be carried out upto 3rd floor roof of the building, Cost of necessary scaffolding and safety precautions shall be provided without any extra cost to the Govt. (c) Equivalent makes may also be user subject to prior approval of the GE.

Demolition of existing cement concrete (un reinforced) in padding of roof slabs, covings of chajjas, including any type of tarfelt etc, roughening surfaces of old concrete roof slab/chajjas by picking, sweeping clean and washing down with water to remove dust, etc, brushing neat cement slurry with 3.0 kg of cement per sq metre and rendering 10mm thick cement plaster in cement mortar 1:3 mixed with water proofing compound as per manufacturers instruction over and including 25mm thick plain cement concrete type B0 (1:2:4) using 12.5 mm graded aggregates and including two coat of damp proof ultra through mechanical mean as directed by manufacturer complete. Make : Asian or equivalent make of Sika/fosroc/including all necessary scaffolding and safety measures complete all as specified and directed by Engineer-in-Charge. Note : (a) Work shall be carried out through manufacturer authorised applicator & contractor to submit MTC and and test certificates alongwith gaurantee certificate from manufacturer. (b) Work shall be carried out upto 3rd floor roof of the building, Cost of necessary scaffolding and safety precautions shall be provided without any extra cost to the Govt.

Providing Plain cement concrete in 1:2:4, type B-0 using 12.5 mm graded crushed stone aggregates as in roof kerbs, benching rounded or chamfered on edge including rounded or chamfered edges with necessary form work etc, complete all as specified and directed.

Disconnecting water tank from roof slab/staging upto triple story building, float valve with float arm and outlet pipe from PVC service water tank, empting, cleaning and removing all scales and dirt etc from tank and finally washing the internal surface with bleaching powder, closing wash outlet, refixing water tank in original position incl replacement of old tank nipple & GI union, including writing "Cleaned on dt___ and due date _____for cleaning, using paint , for tank capacity upto 500 litres, complete all as specified and as directed.

Taking down steel 15mm dia tubing and connections, including cleaning for refixing or removal to store, complete all as specified and as directed.

Refixing 15mm old steel tubing with and including new GI fittings in new or old position on walls, complete all as specified and as directed.

S & F 15mm dia steel water tubing medium grade galvanized with and including all fittings such as bend, tees , union etc and fixed complete to walls and ceilings or laid in floors, complete all as specified and directed.

Taking down steel 20mm dia tubing and connections, including cleaning for refixing or removal to store, complete all as specified and as directed.

Refixing 20 mm old steel tubing with and including new GI fittings in new or old position on walls, complete all as specified and as directed.