Waterproofing of RCC base (E) : After cleaning of the surface of the RCC base the surface must be thoroughly wetted. This is a definite pre requisite and is required to ensure that all the capillaries, pores, etc in the in the RCC base has been filled with water. On this wetted surface, Koster’s NB 1 system will be brush applied. Koster’s NB 1 system consists of hydraulically reactive powders which on contact with water will react and form a silicate thus effectively plugging all pores and capillaries forming a watertight integrated part of the RCC slab. Together with its crystalline properties it will travel into the capillaries, pores, etc (reacting wherever there is water) thus effectively plugging the entire surface making it water tight. After the first layer is applied and 24 hours have elapsed the surface will be wetted again and then the second layer will be applied. This layer will extend 25 – 35 mm outside the line where the Perlite Concrete installation will be completed. After a period of 6 hours the surface will be ready to take the installation of Perlite Concrete.

Backing Plaster on foam Glass : A backing with vermiculite plaster is spray applied onto the foam glass vertical surface upto a thickness of 25 mm. Approx.

Waterproofing on Backing Plaster : Waterproofing with Koster’s NB elastic system is nstalle on the vertical surface of the backing plaster and allowed to air cure for 24 hours.

Installation of Perlite Concrete ( C ) : Perlite Concrete of mix design 1 : 2.5 (by volume) will then be installed as per the drawing, in the area from Y to X. The concrete will be placed manually with specially made implements so as to push the concrete right to the far end and against the Backing lining on the inner wall. The concrete will be placed in such a manner so that there will remain a gap at the top, ranging from 10 – 20 mm on the far end – Y – and 40 – 50 mm on the outer end – X . The outer surface will be finished smooth.

Curing : Perlite Concrete is will be water cured for 7 days.

Drying : The Perlite Concrete, after the curing period, must be dried thoroughly.

Installation of Modified Perlite Concrete ( B ) : Perlite concrete of mix design 1 : 2.5 ( by volume ) and specified modified with a bonding emulsion and a plasticizer especially designed for this application, will then be installed above the first layer of Perlite Concrete. This concrete which will be sticky will then be inserted into the gap, deliberately left during the previous installation of the Perlite Concrete, and will be thoroughly compacted. The outer surface will be finished smooth.

Curing : Wet Perlite concrete is left in place to cure for 7 days.

Drying : The Perlite Concrete, once again, after the curing period must be dried thoroughly.

Waterproofing of the Outer Face of the Perlite Concrete : After the outer face of the Perlite concrete has been sufficiently smoothened and dried. The surface will be thoroughly wetted and then the Koster’s NB Elastic system will be brush applied. This system will be carefully applied so as to ensure that the application will installed so as to extend well on to the steel plate on the top and extend over the water proofing layer already installed on the surface of the RCC base slab. After a period of 24 hours the surface will be wetted thoroughly and then second layer of NB Elastic will be brush applied over the first and after a period of 24 hours the whole system will be ready to be handed over to the customer.