SPECIAL REPAIR TO ROOF TREATMENT, VERTICAL SHAFTS AND SEEPAGE IN PIRU VIHAR UNDER GE (WEST) DELHI CANTT-10

Demolition of cement concrete (Un reinforced) in ground floors n.exc 15cm thick (above or below grnd level) complete all as specified

Demolition of cement ( Un-reinforced) in above Ground floors and paving exc 15cm thickness above ground level) complete all as specified.

M & L for 750 mm wide as in plinth protection, 75 mm thick cement concrete 1:3:6 type C-2 (Nominal Mix) with 40mm crushed stone aggregate finished even and fair, laid to slope of 1 in 12. It shall be laid in alternate bays, each bay not exceeding 3 m length with joint to be filled with bituminous mastic filling comprising a mixture of 1 part of heated hot blown bitumen 85/25 penetration and two parts of heated sand, complete all as specified and directed by Engr-in-charge.

Pre-painted galvalume aluminium zinc coating GI based plain steel sheet 0.50mm of any colour having tensile strength of 550Mpa as in roof covering/cladding to wall, fixed with self tapping screws as specified Note :- steel sheet , provide over chhajja upto G+8 storey building using scaffolding .

Dismantling of brick tiles or terracing tiles single layer on roof complete all as specified and directed.

Demolition of mud phuska on roof slabs, any thickness including cleaning of roof surfaces and removing the debris upto the distance exc 1.00 Km but not n.exc 1. 5 Km complete all as specified and directed.

Scraping old tar from roof treatment over concrete padding of any thickness etc from roof including finishes or junction or parapet and cleaning the surface completely all as specified

M&L for cement concrete 1:2:4 type B1 (using 20mm graded stone aggregate) on roof padding surface finished even and smooth without using extra cement complete all as specified and directed.

M&L for protection plaster 15mm thick on cement mortar 1:3 admixed with appropriate integral water proofing compound complete all as specified. (Note : Supply only WPC shall be measured and paid separately)

M&L for water proofing treatment to roof surface, with APP polymeric based water proofing membrane 3mm thick & weighing not less than 3.0 Kg / Sqm of approved make black finish consisting of a central core of high molecular high density polyethylene film (HMHDPF) & reinforced with non woven polyester matt of min 150 gm/sqm with a thermo fusible finish laid over a coat of hot blown bitumen of 85/25 grade conforming to IS 702 @ 1.2 kg/sqm over a coat of an bitumen primer conforming to IS-3384 @0.4 Ltr/Sqm over prepared roof surfaces, forcing overlap with a propane or a butane gas torch with a overlap of 75mm at sides & 100mm at ends & sealing including applying a coat of cold emulsion bituminous primer complete as per manufacturer's instructions complete all as specified and directed. Note :- 1. Water proofing treatment shall be got carried out by the manufacturer or their authorised applicator only. 2. Bitumen primer, bitumen and membrane shall be of same make / manufacturer. (ii) The APP Membrane to be inserted in the parapet wall/wall by cutting chases of atleast 65mm X 50mm size& making good in CM 1:3.