eTender for the Waterproofing, External crack repair and wall Painting works in TICEL Phase I building, Taramani, Chennai

Amount

Waterproofing Treatment over External wall

Cleaning the surface, removing the laitance, old paints with wire brushing and water pressure jet wash. Areas of algae, mildew or fungus on the wallshould be cleaned with 1 part household bleach and 3 parts water, followed by a power washer rinse using clear water. Tapping & marking of loose plaster / concrete surface on the external wall using nylon hammer. Remove loose plaster with mechanical devices or manually at any height and cleaning the surface etc. Providing and applying 20 -25 mm thick sand faced two coat plaster in the ratio of 1:4 mixed with an integral waterproofing compound @ 200 ml / 50 Kg bag of cement, over the bond coat prepared with SBR and cement in the ratio of 1:1 by volume of the cement finishing, and moist curing for 5 days, etc. complete. All cracks up to 3 mm in width should be opened up 5mm making the V groove and fill with acrylic paste. Apply the primer coat prepared with acrylic Paste and water in 1:1 proportion over the crack surface. Fill cracks with acrylic Paste when the surface is tacky and not dried completely with a spatula or putty knifes and level with the surface. For Large cracks more than 5mm and separation gaps use polymer-modified mortar (PMM) mixed with SBR @ 1.5kg per bag of cement after making the V groove.Apply one coat of efflorescene resistant penetrating primer in a 2:1 ratio with water maintaining a spreading rate of 8-10 square meters per liter for a single coat. Allow the primer application to dry for 4-6 hours. Exterior Waterproof Coating: Providing & Apply one coat of Basecoat without any dilution Maintain the spreading rate of 3.70 - 4.20 Sqmtr per liter/ coat application to achieve about 110-130microns DFT. The base coat shall achieve a technical parameters of solid content: 58% to 63%, elongation: 150% (ASTM D 412-02) and a tensile strength of 2MPA (ASTM D 412-02) Followed by, Applying a coat of Top Coat made of reactive acrylate copolymer technology of desired shade & color with interval of 6- 8 hours without any dilution; maintaining a spreading at rate of 6.0 – 6.40 Sq mtr per liter / coat (60 - 65 sq ft per litre / coat) to achieve DFT of 50 - 60 microns. The material having following technical properties, Attains hairline crack bridging up to 2 mm, Elongation of >100 % as per ASTMD 412; Tensile strength 2.50 Mpa per ASTM D 412, Complies to anti carbonation test as per EN 1062 part 6 the system.The quoted rate shall include the cost of all materials, labor, tools, and equipment, including provision of scaffolding or suspended platforms, or rope access systems, as required for safe working up to G+5 floor levels. The contractor shall provide a 10-year warranty for waterproofing and a 10-year performance warranty for painting works. (Approved Make: Dr.Fixit/Fosroc/Sikaa/Asian Paints)

Sealant Application in External ACP/Glass panels and Windows

Sealant application: Removal of the existing sealant between the panels and exposing the joint for a minimum of 2 to 3 days to sunlight to remove the residual moisture, if present below the sealant. Providing and applying single component high modulus hybrid silyl modified PU sealant with masking tape on either side of the joint and the sealant shall require no primer. Once the sealant is applied, the masking tape shall be removed and the top surface of the hybrid sealant shall be tooled in order to form a concave shape. Care to be taken so that there is no air entrapped/bubble formation in the sealant application. The contractor shall provide a 10-year warranty.

Waterproofing Treatment over terrace

All loose and de-bonded concrete/ screed, loose particles, dirt & should be removed. Roof substrates must be pressure-washed with water with a minimum working pressure of 1,400 psi to be used to and/or remove all dirt, dust, chalking and waste products. Remove algae, mold by using bleach solution or biowash. All visible hairline cracks on concrete roof screed more than 0.50 mm and not giving hollow sound, should be cut and widen in V shape with mechanical cutter in the size (8mm W x 6mm D). Fill cracks with Hybrid Sealant with suitable gun and smoothed with a putty knife or trowel. Allow sealant to cure a minimum (72 Hrs.). Remove loose and damaged concrete roof screed in pockets with mechanical cutter. Clean the concrete screed with high pressure water jet to remove dirt and loose particles. Brush applies a bond coat of SBR mix in the ratio of 1:1 (SBR 1: Cement 1) by volume to make it lump free slurry when applied on in the pre wet surface. Laid to fall roof screed in correct slope and gradient. Mix SBR 2kg per of cement in (M20) concrete in ratio of 1:1.5:3. Level the repair mortar and finish with trowel. Moist cure and Air cure screed before application of roof topcoat coating system. Providing 100mm x 100 mm Square / rectangle upstand of M20 grade concrete or with PMM around mechanical equipment like HVAC, air?conditioning, solar panels. Etc. Apply self priming coat followed by two coats of high performance acrylate-silicon based solar reflective waterproofing coating over the entire upstand, embedding it 45 GSM glass fiber mesh while the waterproofing coating is still wet. Apply Hybrid silyl modified PU Sealant around the junction of fabricated stand inserted and wall mounting mechanical fixtures. Apply a coat of high performance acrylate-silicon based solar reflective waterproofing coating (diluted with water in the ratio 2:1) self-priming coat at the rate 8–10 sq.mt./liter/coat in the SSD condition. Apply 1st coat at the rate of of 0.45 – 0.5 / litre / Sq.mt / Coat. Laying a 45 Gsm glass fibre mesh of 2.5 mm x 2.5 mm sandwiched between the first and second coat. While the 1st coat is still wet. Allow the first coat to dry for 4-6 hours. Apply second coat with the same application coverage. Application direction of second coat should be perpendicular to that of the first coat. Allow second coat to dry for 4-6 hours. Apply third coat at an application direction that is perpendicular to that of the second coat with same application coverage rate to achieve total dry film thickness of 900 to 1000 microns at forced coverage at the rate of 1.50 – 1.60 litre / Sq.mt in 3 coats. Check to see no void surface is left untreated / uncoated. Allow the system to air cure for 7 days minimum. The material having following technical properties: Attains a Tensile Strength with Fiber N/mm 2 ≥6-8 as per ASTM D 2370; Elongation at break ≥ 200% as per ASTM D 2370, Crack bridging ability up to 2 mm, Shore-A Hardness 80 as per ASTM D2240-2015, Tear Resistance with Fiber N/mm 34 as per ASTM D 624. For vertical surfaces and parapet walls should be enveloped & coated / painted with waterproofing coating system adopted for external walls. Note – Coating should be terminated below the drip mould on the vertical surface. The contractor shall provide a 10-year warranty for waterproofing and a 10-year performance warranty for painting works. (Approved Make: Dr.Fixit/Fosroc/Sikaa/Asian Paints)

VEKAY ENGINEERING SOLUTIONS AND ASSOCIATES (BID ID -1371208)