Specification for Waterproofing of Water Tanks
Method statement
1. Surface Preparation
Surfaces to be applied upon, must be clean, reasonably dry, free form dirt and loose
material, and be as smooth as possible. All voids and pinholes shall be filled using a
non-shrink grout material. A proper fall / slope should be provided to allow standing
water to drain. Ponding should not be present.
25 mm x 25 mm angle fillets of non-shrink mortar should be placed at the intersection of
all vertical and horizontal surfaces and changes of direction to from a cant for the
waterproofing membrane to turn up.
2. Waterproofing
Grouting of cold joints
All the construction joints in walls shall be grouted with cement slurry admixed with
expansive additive at 500 mm c/c distance using suitable injection grouting pump. The
grouting nozzles shall be removed after the grouting is over and shall be finished using
polymer-modified mortar containing ApcoBuild Seal n Safe
Application of ApcoBuild SureSeal waterproof coating
Apply by brush or roller a coat of ApcoBuild SureSeal a polymer modified cementitious
seamless waterproofing membrane at a rate of 2 to 3 square meter per kg to all required
areas, at a thickness of 500 – 600 microns.
Lay 200-micron glass fiber cloth uniformly over the 1st coat of ApcoBuild SureSeal
when it is still wet. Allow it to dry for 4 to 6 hours.
Apply second coat in the opposite direction at the same rate. The total thickness of
waterproof coating shall not be less than 1.2 mm at any point. The treatment shall be left
as it is for 72 hours for air cure before carrying out further work.
The care shall be taken to apply the coating in the internals of drain out let pipes.
3. Finishing
Apply neat coat of ApcoBuild Hydrocrete over the cured (after 72 hours) film of
ApcoBuild SureSeal and allow it to become tacky.
Apply 10 to 12 mm plaster in cement mortar in 1:3 admixed with integral waterproofing
compound ApcoBuild Hydrotite IWC at 200 ml dosage per 50 kg bag of cement over
the bond coat when it is still tacky and finished it smooth.
Cure mortar for 15 days by filling the water.
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