CWE/CHM-64/2026-27 SPECIAL REPAIR TO ROOF TREATMENT AND OTHER CONNECTED WORKS IN PINE MARG AND SUNRISE COLONY AT CHANDIMANDIR MIL STN UNDER GE CHANDIMANDIR

Dismantling brick tiles or terracing tiles, single layer on roofs complete all as specified and as directed by Engineer-in-Charge.

Demolition of mud in roofs, any thickness, including plastering and leeping (whether full thickness removed or only a part thereof) complete all as specified and as directed by Engineer-in-Charge.

Removal of excavated material (soil) to a distance not exceeding 250 metre and depositing where directed at a level not exceeding 1.5 metre above the starting point, complete all as specified and as directed by Engineer-in-Charge.

Material and labour for 40 mm thick (average) plain cement concrete 1:2:4, type B-0 (using 12.5 mm graded stone aggregate) as in levelling courses laid on roof with required slope complete all as specified and as directed by Engineer-in-Charge.

M&L for Screed bed or bedding layer 15 mm thick in cement mortar 1:6, for laying floor finishes complete all as specified and as directed by Engineer-in-Charge.

Supply and fixing Heat Resistant Terrace Tiles, 300 mm x 300 mm x 20 mm with SRI (solar refractive index) > 78, solar reflection > 0.70 and initial emittance > 0.75 on waterproof and sloped surface of terrace, laid over nad including 20 mm thick cement sand mortar in 1:4 and grouting the joints with mix of white cement & marble powder in ratio of 1:1 including rubbing and polishing of the surface upto 3 cuts complete including providing skirting upto 150 mm height along the parapet walls in the same manner complete all as specified and as directed by Engineer-in-Charge.

Material and labour for waterproofing treatment to roof complete in the following stages including removal of existing APP membrane from roof:- (a) SURFACE PREPARATION: Cleaning top surface of roof/ RCC slab using electric wire cup grinder to remove surface imperfections, sharp edges or protrusions at the junctions to achieve a uniform surface profile. Cleaning thoroughly the concrete surface using a high-pressure water jet to eliminate all dirt, dust, oil spillage, laitance, and other contaminants. (b) SURFACE CRACK REPAIR: Cracks on top surface/ RCC slab wider than 1 mm required to be cut and open in V-groove manner (8 mm wide x 6 mm deep) by using mechanical cutter, clean the same and fill with high modulus, moisture curing, silyl modified polymer (hybrid)/Poly sulphide base sealant and allow sealant to air cure for 3 days. Make:- Pidilte Dr. Fixit feviseal HY300 or FOSROC Nitoseal-300 or equivalent product in STP

(c) ANGLE FILLET TREATMENT: Providing and preparing angle fillet at all vertical up stands and junctions/ corners. Moist the surface with water, apply bond coat prepared by mixing universal repair polymer (URP) and cement in 1:1 ratio by volume and apply using brush, preparing PMM by mixing 1 kg of URP, 5 kg fresh cement and 15 kg graded quartz sand, (i.e. in the ratio of 1:5:15 or as specified as per manufacturer's instructions and preparing angle fillet (gola) of size 50 mm x 50 mm over the wet bond coat and finishing the same followed by moist curing the surface for 48-72 hours complete. Make:-Pidilite Dr. Fixit Pidicrete URP/FOSROC Nitobond SBR Latex/ STP Shali SBR Latex.

(d) RAINWATER OUTLET TREATMENT: Hacking and chipping the surface around the rainwater drain outlet up to 25 mm in depth, applying bond coat of universal repair polymer (URP), in ratio of 1:1 (URP 1 : cement 1) by volume, over the corners and pipe insert outlet gaps, filling the gaps around drain mouth with PMM (Polymer Modified Mortar), mixed with universal repair polymer (URP) 10% by weight of cement, in the ratio 1:3 or as specified as per manufacturer's instructions. Providing and fixing 100 mm width, 225 GSM, fiber glass chopped strand mat around the periphery of drain mouth of rainwater outlet, sandwiched with two-component UV resistant poly urethane waterproof top coat. Applying two thick coats of two-component UV resistant poly urethane waterproof coating to completely cover the mesh/ fabric and surrounding area. (e) WATERPROOFING APPLICATION: Preparing premix of two-component high-strength poly urethane waterproofing coating using an polyelectric double paddle mixer at low speed for 2-3 minutes until a uniform blend is achieved without dilution. Applying the waterproofing coating on an SSD (Saturated Surface dry) condition, apply first coat mix at the rate 0.8-0.9 kg/sqm using a lamb's wool roller or as specified as per manufacturer's instructions.

Contd.. While the coating is still wet, roll and embed a 225 gm fiberglass chopped strand mat ensuring full bonding without air bubbles or wrinkles and overlap joints by at least 5 cm at end points & allow the first coat to dry for 3-4 hours. Applying the second coat at 90 degrees angle to the first coat at 0.9 kg/sqm or as specified as per manufacturer's instructions, once the surface is dry enough to walk on. Additional coats may be applied as required to achieve a forced material consumption to obtain a DFT of 1000 to 1200 microns with minimum material consumption of 1.8 kg/sqm over 2-3 undiluted coats or as specified as per manufacturer's instructions. The coating should terminate below the drip mold on vertical surface. Make: Two components UV resistant Poly Uretherane elastomeric water proof of Pidilite Dr. Fixit Wonder Proof 100/ STP Shaliuretherane LHM 2K80 or equivalent in FOSROC