Clean the top of the chajja and chisel extra mortar, if any.
Apply a thick cement slurry over the top of the chajja.
Apply 1:1:3 metal screen coat.
Make rounding (watta) at the junction of chajja and wall of the building.
Cure this coat for seven days.
Apply a finishing coat with C.M. 1:4 with water-proofing compound.
Apply cement slurry with the water-proofing compound for smooth finish (ghotai). Polish with a metal float and make impression with a 2mm diameter cotton line dori, to avoid cracking.
Cure the water-proofing for at least seven days.
Details of Chajja Waterproofing
