PROCEDURE OF BRICK BAT COBA WATERPROOFING

1. The surface of the roof slab should be cleaned and washed with water before laying the first course.

2. A fresh slurry is prepared by mixing cement with 1-2% super seal powder (acrylic based acrylintryl chemical).

3. The slurry is first mixed dry and then water is added until it reaches a uniform consistency.

4. This freshly prepared slurry is spread on the cleaned roof surface to create a smooth thin layer.

5. Cement sand mortar is prepared by adding 1-2% super seal powder in a 1:5 cement sand dry mix (1 part cement, 5 part sand).

6. Water is added to obtain a plastic mortar.

7. This cement mortar is spread on top of the thin slurry 
layer to obtain a 20mm thick cement mortar layer.

8. Brick bats are inserted in the 20mm cement mortar layer to create a 100-150 mm brick bat later layer.

9. The cement sand mortar is then used for grouting the previously laid brick bat layer. All voids and joints are filled.

10. Ensure a smooth slope surface over the brick bat layer.

11. Freshly prepared plastic cement sand mortar is further spread on the grouted brick bat layer.

12. The grouted surface is allowed to cure for 2-3 days to avoid surface cracks.

13. Another cement sand mortar is prepared (1 part cement, 5 part sand) with 1-2% super seal powder. Water is added until the mixture is consistent.

14. 20mm thick layer of this mortar is spread over the brick bat mortar layer.

15. A trowel is used for finishing. Square markings can be made by string or trowel. This is to prevent surface cracking due to expansion or contraction in response to temperature change.

16. Curing is continued for 2 weeks.

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