The wata in your terrace and chajjas, which have cracks need to be attended first. It is recommended to break the existing wata, remove all loose dust particles with the help of wire brush, water jet, etc. Apply a coat of FAIRCRETE SB (L) mixed with cement in the proportion of 1:1.5 on the surface covering sufficient area of slab and wall. Make new wata in 1:3 cement mortar adding FAIRCRETE SB(L) 10 to 15% by weight of cement & apply it when coat is tacky.