Terrace waterproofing works

Amount

CRACKFILLING ON PARAPET WALL (UP TO CHAJJA) & MUMTY ROOMS: Providing and applying crystalline mortar by mixing in the ratio of 4.5:1 (4.5 parts crystalline mortar: 1 part water) for the treatment of cracks and spalled & honeycombed surface of parapet wall and mumty rooms. The crystallie mortar shall conform to the EN 1504- 3 having compressive strength Class R4 >= 45 MPa and adhesive bond strength Class R3 >= 1.5 MPa. The work shall be carried out all complete as per specification and the direction of the engineer-in-charge. The product performance shall carry guarantee for 10 years against any leakage. For sealing cracks, routed out/ making U-shape groove size 25x25 mm and then primed the area with integral crystalline slurry @0.05 kg/running metre and while the surface is tacky filled the groove upto surface with crystalline mortar @1.50 kg/running metre. Once crystalline mortar is touch dry then finally applied two coats of integral crystalline slurry @0.05 kg/running metre per coat.

REPAIRS TO PLASTER ON PARAPET WALL (UP TO CHAJJA) & MUMTY ROOMS: Repairs to plaster with sand faced plaster in patches of area 2.5 sq.meters and under. Cutting the patch in proper shape, raking out joints and preparing the surface. Providing sand faced plaster in cement mortar using approved screened sand, including base coat of 12 mm thick in cement mortar 1:5 (1 cement : 5 coarse sand) using waterproofing compound as per manufacturer specification and curing the same for not less than 2 days and keeping the surface of the base coat rough to receive the sand faced treatment 6 to 8 mm thick in cement mortar 1:3 (1 cement:3 coarse sand) finishing the surface rough with sponge by taking out grains and curing (for fourteen days). Including disposal of rubbish to the dumping ground, including cost of Jhula and Complete in all respect as per the direction of Engineer- in-Charge.

PMM REPAIR WORK UP TO 30 MM ON WALL (UPTO CHAJJA) & MUMTY ROOM :Repairing to the existing RCC structural members (vertical or horizontal) using ready mix Polymer Modified Mortar (Fibre reinforced structural grade repair mortar) of approved brand where the thickness of repair is up to 30 mm. Surface preparation- All loose traces of concrete or mortar, dust, grease oil, etc. must be removed. Damaged or contaminated concrete shall be removed to obtain a keyed aggregate exposed surface. Clean the surface using high pressure water blasting. Clean all exposed reinforcement to a minimum grade of Sa 2 according to ISO 8501-1 / ISO 2944-4. Ensure all visible portions of the reinforcing bar is clean. Where reinforcing bars are corroded, cut back the concrete around the reinforcing bars, Grit blast to remove corrosion products from around reinforcing bars and coat with approved epoxy coating for corrosion protection as recommended by the Engineer. Replace the affected part of rebar if the diameter after grit blasting is found reduced by more than 20% of the original diameter on the advice of the engineer. Bond Coat- Providing & applying One coat of structural grade epoxy bond coat by brush conforming to ASTM-C-882-87 to the prepared concrete surface to be repaired / strengthened and repairing with PMM shall be done when the surface is tacky. Mixing - Only full bags are mixed. Damaged or opened bags should not be used. Mix the ready-mix Polymer Modified Mortar in a forced action pan mixer, or with a helical paddle attached to a low speed (300-600rpm) mixer for 3 minutes until a lump free, thixotropic consistency is achieved. Only use clean water. Mixing water needed: 3.75 to 4.25 litres per 25kg bag or as recommended by the Manufacturer of Polymer Modified Mortar. Allow the mortar to rest for 2 - 3 minutes and then remix briefly before pouring into formwork. If temperature more than 40°C then use chilled water for mixing. Mortar application - The minimum temperatures must be maintained during application and for at least 24 hours thereafter for optimum curing of the product. The prepared substrate should be presoaked, preferably for 24 hours, but at least 2 hours before applying Polymer Modified Mortar. The surface must be saturated surface dry, but without standing water. Polymer Modified Mortar can be spray- or hand-applied. Apply mixed product directly to the prepared damp substrate, or wet on wet onto the primed surface. Spraying the material with the necessary pressure will ensure good adhesion of the material. A thin scrape coat or contact layer before building up to the required thickness, wet on wet, will improve adhesion especially in case of hand application. Apply to the desired layer thickness upto 15 mm in single layer and after hardening, provide second layer of required thickness (total upto 30 mm) and level using a screeding bar, trowel or wooden board. If required, bond coat shall be provided as per the recommendation of manufacturer between two layers of polymer. Protective coatings- Subsequent coatings of any ant carbonation barriers or silane impregnations should be applied if recommended by the Engineer. Plaster- The repaired surface shall be matched to the surrounding surface by providing required thickness of plaster internal or external plaster. Curing - Minimum 7 days curing shall be done to the newly repaired area using any suitable method.

PARAPET WALL AND MUMTY ROOM WATERPROOFING: The surface must be cleaned with stiff nylon/wire brushing, followed by water jet cleaning. Algae and fungus on terrace roof shall be treated with a fungicidal solution. Strip all the old paint / putty and remove all the loose particles if any. All cracks up to 3 mm in width should be opened up 5mm making the V groove and fill with approved crack filler paste as per the manufacturer specifications. Mix coating at slow speed with drill and mixing paddle to ensure uniform mixing of material. Apply a self-primer coat if flaking or scaling is observed. Roller/Brush/Spray apply one coat of approved Elastomeric External Waterproofing Basecoat without water dilution maintain the spreading rate of 4 sq. mtr per litre / coat application to achieve about 120 microns DFT. The second coat of approved Elastomeric External Waterproofing Topcoat in desired color shade with interval of 7 hours without any dilution. Maintain the spreading rate of 6 sq. mtr per litre / coat application to achieve about 60 microns DFT. The material should have Tensile strength of minimum 2.5 Mpa; Elongation of minimum 100. Includes cost towards use of Jhula.

REPAIRS TO BROKEN CHINA MOSAIC ON TERRACE TOP: Evaluate the debonding of china mosaic tiles on the terrace roof by tapping with a nylon hammer. Give special attention to areas around roof penetrations, ponding spots, and parapet wall junctions. Wherever proper slope is not there, the area has to be give proper slope by redoing china mosaic flooring in that patch. Tapping and identifying the hollow and broken china Mosaic and Laying the flooring of broken China-mosaic (broken pieces of China glazed tiles) of approved colour set in 25 mm. average bed of C.M. 1:3 with waterproofing compound to correct level and slope (1:100) well compacted and finished; such that China mosaic chips covers total area of slab. Proper slope and neat finishing. Complete including disposal of rubbish to the approved dumping ground.

TOPCOAT WATERPROOFING ON TERRACE: Surface Preparation: The roof must be cleaned with stiff nylon and wire brushing, followed by high-pressure water jet cleaning. Algae and fungus on terrace roof shall be treated with a fungicidal solution. Existing coatings should be removed by mechanical methods like grinding and wherever required, grinding has to be done to enhance the adhesion and bonding of coatings to china mosaic flooring. Rainwater Outlets/Other Areas Treatment: Chipping the surface around the rainwater drain outlet mouth up to 25mm in depth. Apply a bond coat of SBR based polymer admixed with integral waterproofing compound & cement mixed in the ratio of 1:1 (polymer 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 waterproofing bonding agent 10% by weight of cement in the ratio of 1:3. Providing & fixing 100 mm width 45gsm glass fiber mesh all around the periphery of drain mouth of rainwater outlet sandwiched with waterproof coating. Apply the second coat on an interval of 4-6 hours, all over the rainwater outlet. Treatment of other areas may be execuited as per the engineer in charge. Waterproofing Coat On Terrace: Apply one self-priming coat of approved PU based roof waterproof topcoat as per manufacturer specifications, at the rate of 10 sq. m./ltr. Allow it to dry for 3 hours. Apply the first coat of approved PU based roof waterproof topcoat coating at a rate of 2 sq.m./ltr./coat. Allow the coating to air cure for a minimum of 6 hours to walk, and apply a second coat at 90° to the first coat. Apply second coat, at the rate of 2 sq. m./ltr./coat. The system will achieve a total dry film thickness of about 500 microns. The coating should be terminated below the drip mold on the vertical surface. All corners, gaps, joints, and roofleak repair area and outlets shall be coated with two extra coats. Air cures the coating for 7 days. The wtaerproofing coat should have Volatile Organic Compound (VOC) less than 2.5%, Tear Resistance greater than 15 N/sq.mm, Crack Bridging Ability of minimum 2 mm. The work shall be taken up through manufacturer approved applicator. The treamtmet should provide 10 years warranty for the terrrace waterproofing work. Clear horizontal measurement between walls will be paid for actual. All above operations to be done in order and as directed and specified by the Engineer-in-charge.

Chauhan Construction Pvt Ltd (BID ID -3181892)

hirani enterprises (BID ID -3185074)