→ Pebble-dash is a coarser plaster surface used on outside wall that consists of lime and sometimes cement mixed with sand, small gravel and often pebbles or shelb. → Rough cast or pebble-dash is same thing. → Sand faced :- Plastering provides a finished surface that is firm and smooth. The plaster act as thermal insulation. Plaster is a layer of cement sand mortar applied over a masonary works which also acts as a damp proof coal over the masonary.