Repairs to the waterproofing treatment of TG Building terrace and other areas in HWPM.

Amount

Dismantling of concrete/ brick work manually including safely removing without damaging parent structures and disposing off the dismantled material to dumping yard lead upto 1.05km etc at all heights., all complete as per specification and as directed by the Engineer-In-Charge.

Preparation of roof slab top surface and pre-treatment for arresting leakages as detailed below:(i) Cleaning the surface by hard wire brush and light chiselling for making the surface free from dust, other laitance etc., including removal of old waterproofing membrane and hacking the surface as required and as directed by the Engineer(ii) Washing the surface with compressed air, including clearing all the vegetation if any, to make the surface free from any oil, grease, dust etc. complete as directed by Engineer(iii) Cutting grooves in "V" shape along visible surface cracks in slabs, along the constructions joints, wall slab junctions etc. with cutting machine, cleaning, washing and filling the prepared cracks/ grooves with single compound/ One-part Polyurethane crack filler from CERA/ SIKA/ FOSROC/ Dr Fixit.(iv) Filling local depressions wherever required with 1:2:4/ Cement mortar 1:3 gauged with LATEX SBR from CERA/ SIKA/ FOSROC after applying a bond coat.(v) After preliminary treatment as above, terrace area shall be tested for any leakages by spraying adequate water as directed by the Engineer. Any leakages found shall be rectified as directed by the Engineer.(vi) Prepared area shall be got approved by the Engineer-In-Charge for leak proof before taking up further course of water proofing treatment.

Providing and applying industrial grade two part polysulphide joint sealant of FOSROC/ SIKA/ PIDILITE make for sealing the construction/ expansion joints of depth 6.4 to 12.5mm etc., complete all as per manufacturer specifications and as directed by the Engineer in Charge.

Providing Water proofing with APP(Atactic Polypropylene Polymer) modified, prefabricated five layer, 3mm thick water proofing membrane, black finished reinforced with non woven polyester matt, SIKA/Asian paints WP shield 103/ IWL (meeting vital parameters like, Tensile strength/ joint strength in longitudinal and transverse direction at 23oC as 600/ 450 N/5 CM. Tear strength in longitudinal and transverse direction as 300/250N. Softening point of membrane > 150oC. Cold flexibility shall be upto -2oC when tested in accordance with ASTM, D-5147).The work shall be carried out as per the instructions of the Engineer-In-Charge and the following operations with all materials, labour, tools and tackles etc. all complete :(i) Applying a coat of bitumen primer on prepared surfaces, applied @ 0.40 ltr/sqm. (primer density at 25oC, 0.87 - 0.89 kg/ltr and viscosity 70 - 160 cps). (ii) Applying First coat of hot applied blown bitumen of grade 85/25 or 90/15 (shall be applied @ 1.45kg/Sqm over the entire area along with APP membrane)(iii) A layer of 3mm thick APP modified water proofing membrane shall be laid by applying hot blown bitumen as above with 10cm overlaps and seal the joints/ overlap using hot blown bitumen as per manufacturer's recommendations.(iv) Applying 2nd coat of hot applied blown bitumen of grade 85/25 or 90/15 @ 1.20kg/Sqm over APP membrane.Note:(1) All relevant test certificates for the materials shall be supplied by the contractor before starting the work.(2) The laying of membrane shall be got done through the authorised applicator of the manufacturer of membrane3) It may be noted that the contractor shall execute Guarantee bond in the prescribed format of the department for a period of Five years for leak proof function of the structures wherever this water proofing item is executed.4) All the debris generated during any of the operations shall be dispose to dumping yard with in a lead of 2kms. As directed by Engineer-in-Charge

M/s AYESHA CONSTRUCTIONS (BID ID -3297951)

naresh constructions (BID ID -3301737)