All static cracks wider than 1 mm. in the substrate must be opened up to 12 mm X 12 mm. and treated with a mix of cement/sand mix with Koster SB Bonding emulsion and water at least 24 hours to application.

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 pressurized water, 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.

MIXING AND APPLICATION:

Materials:
Koster NB cement based crystalline waterproofing system
Koster NB Elastic cement based crystalline waterproofing system
SB Bonding Emulsion liquid
Water
Brushes

Mixing:
To one bag of Koster NB-1(25 kgs), add 7 - 8 liters of water premixed with 10 % SB Bonding Emulsion. Mix thoroughly to a slurry consistency. The system is now ready for application.
The two components of the Koster NB Elastic system must be mixed together. Mix thoroughly to a slurry consistency. The system is now ready for application.

Application:
The Koster NB system is brush applied, on to the already damped surface. The coverage is 0.80 kg per sq. meter per coat. After the 1st coat there should be a gap of 12 – 24 hours before the 2nd coat is applied @ 0.80 kg per sq. meter per coat. Prior to the 2nd coat application the 1st coat surface should be dampened thoroughly to ensure that the chemical reaction is complete.
Coating to be done on entire floor taking on the parapet wall and terminating on other side of top of parapet wall.

For all the pipe insertions the Koster NB Elastic system should be applied right around and onto the pipe section to make it completely watertight. The Koster NB elastic properties of the system will eliminate the possibilities of cracks developing at these junctions.

The area along the construction joints will be treated with Koster NB Elastic after opening the joints in a ‘v’ notch & applying bond coat. Then after it becomes tacky filling the crack with Polymer mortar & leveling the surface. Koster NB Elastic system should be applied in a single coat over the joint in 150mm width over two coats of Koster NB System to make it completely watertight. The Koster NB elastic properties of the system will eliminate the possibilities of cracks developing at these joints.

Testing:
Testing to be conducted after 24 hrs of application of Koster NB Elastic in waterproofed area.
Make a watta around the periphery of the area over which the waterproofing system is applied. Care to be taken that the height of the watta should 75 mm so as to take care of water height of up to 50 mm. Water will be filled and left standing for 48 hours.

Down takes:
A PVC pipe, with ring, of suitable diameter will be inserted into the down take so that the mouth of the down take pipe is totally sealed. Water will be filled and pounded for 48 hours.

Note: All de-watering will be done with the help of Tullu pump or manually and built up watas will be carefully cut and the area will be cleaned.

Failure:
Incase of failure, the affected area will be redone with single coat over the existing waterproofing system and the pond test will be carried out once again. Incase of failure resulting from crack in the watta along parapet wall, the entire section of the wata along the length will be cut open and redone. After 24 hours the waterproofing system will be reapplied overlapping the existing waterproofing by 150 mm on either side. Pond test will be carried out again.

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.