Fillets:
Similarly at all the junctions of the parapet wall and the slab, the fillets must be built up with a mix of cement/sand/quartz sand mix with Koster SB Bonding emulsion and water at least 24 hours prior to the application.

Down take / Pipe Insertions:
Pipe inserts must be installed prior to the application of the Koster NB\Koster NB Elastic waterproofing system. At the opening in the slab around the pipe the substrate should be similarly opened up by cutting back around the pipes to give sufficient depth and cleaned thoroughly. This must be then built up with a mix of cement/sand mix with Koster SB Bonding emulsion and water at least 24 hours prior to application.

Construction Joints:
Finally dampen all the surface areas thoroughly with clean water using high pressure water jet apparatus, as this is necessary prior to the application of the Koster NB system. The dampness in the substrate will ensure that the chemical reaction between the Koster NB system and the chemicals in the concrete substrate takes place completely. However the application of the Koster NB system should not be made over standing or running water.

Application:
The Koster NB system is brush applied, on to the already damped surface. The brush on is done in 3 coats. The coverage is 0.65 kg per sq. meter per coat and each coat is done perpendicular to each other. After the 1st coat there should be a gap of 12 – 24 hours before the 2nd coat is applied. Prior to the 2nd coat application the 1st coat surface should be dampened to ensure that the chemical reaction is complete on the underside. No water curing is required. Similar procedure must be followed for the 3rd coat. The finished surface should be left exposed for 48 hours.

For all the pipe insertions, cold joints, construction joints, separation joints masonry joints areas the Koster NB Elastic system should be applied to make it completely watertight as 4th coat. The Koster NB elastic properties of the system will eliminate the possibilities of cracks developing at these junctions.

For the expansion joints care must be taken to complete the application of the Koster NB system right into in insides of the expansion joint first. Once this is complete and cured then a backing of thermocole is provided as a filler material and the final 25-mm must be filled with Polyurethane sealant. This will help to take care of the high expansion/contractions of the substrate at these points. This treatment is carried out at additional cost.

All vertical and horizontal watas must be built up and then treated with the Koster NB and then the Koster NB elastic system as given above.

LIMITATION:
The Koster NB system cannot be applied on running or standing water.
The Koster NB system must be protected from acid or sulphurous attack in concentrations exceeding that in Portland Cement Type I / II
The Koster NB system once installed must be protected from damage by other agencies working in the installed area. Further if applied on the positive side protection must be provided against mechanical damage.