SPECIAL REPAIR TO CERTAIN EM AND BR WORKS IN ELECTRIC SUPPLY INSTALLATIONS AT KANCHRAPARA MIL STN UNDER GE BARRACKPORE

Taking down all existing roof treatment and demolition of cement concrete padding/levelling course (any thickness as available in site) including wire brushing and cleaning loose dust etc from surfaces of RCC roof including flashing and junction of parapet complete all as specified and as directed.

M&L for 40mm thick PCC 1:2:4, type B0 (using 12.5mm size graded crushed stone aggregate) as levelling course, padding on chajjas, etc including angular moulding at junction upto 10cm height mixed with WPC as per manufacturer's instruction, applied over prepared surfaces complete all as specified and directed. Note : (i) WPC shall be measured and paid separately as supply only. (ii) PCC shall be laid to achieve true slope towards the drain/weep holes.

M&L for preparation of RCC roof surface or wall & floor of sunken slab by cleaning the entire roof with Pressure water jet to remove the unwanted dust, loose material or any other material which may impair adhesion of the material. Surface must be cleaned and dried properly so that any cracks on the substrate can be visible. Concrete substrate to be cleaned up to exposed sound concrete cover, remove dust, laitance etc, which may impair adhesion of the material. All surface cracks up to 1-2 mm wide should be filled with single component cold applied elastomeric waterproofing coating (Dr. Fixit Roof Seal Ultra or equivalent) using a brush and adding a coat on the slab on both sides of the crack, up to a distance of 100 mm around it. Cracks more than 1-2 mm should be widen by making V-groove and repaired with PMM (Polymer Modified Mortar) using Dr. Fixit Pidicrete URP or equivalent 10% by weight of cement complete all as specified and as directed. Note : (i) Finished surface shall be as per satisfaction of Engr-in-Charge. (ii) All cracks shall be prepared and checked by Engr-in-Charge before and after treatment for the satisfaction and rates quoted shall be including the quantum of cracks in proposed surfaces which shall be checked on ground by the contractor before quoting bid. (iii) No additional amount shall be claimed further for repairing cracks. (iv) Entire application shall be carried out by trained certified manufacturer applicator only.

Supply only Nanotechnology based Elastomeric Hydrophobic Powder/admixture (EHP) powder for cement plaster and concrete complete all as specified and directed.