SPECIFICATIONS FOR WATER TANKS/CHAJJAS WATERPROOFING TREATMENT

1. Cleaning the existing the RCC surface area with wire brushing and washing the same.
2. Filling up the cracks ( if any ) with rich mix cement mortar or Non Shrink Grouts.

3. Applying acrylic co-polymer based, cementatious waterproof coating over the entire surface area to be treated.

4. COVING : Junctions and Joints are the most leakage prone areas of any structure. Utmost care has to be taken by rendering a COVING/ WATTA in CM 1:4 in proper size at the junctions and off course at the slab level.

5. DASH COAT : To provide the mechanical key, apply a dash coat or rough cast in CM 1:4 over the chemical coating for the proper bonding of any renderings.

6. Rendering average 30 to 40 mm thick cement screed ( Sand + Aggregates + cement) with proper compaction at the HORIZONTAL surfaces and 20MM thick cement plaster and finishing smooth.

7.CURING the same for at least 15 days.

IMPORTANT :
Use of Integral waterproofing plasticisers/ fibers makes the cement mortars/screed /slurry flow able, homogeneous by reducing the water cement ratio and enhances the properties.

Also use of Flexible Chemical coating over the joints prevents the re occurrences of the cracks.

WATCH POINTS :
1. Construction joints to be treated with flexible coatings.

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