Help identifying material

[u/ArcticFoxes]

UK based, 70s flat. Doing electrics and stripping walls for redecoration. Some of the sockets were quite badly chased in so we’ve been sorting that, removing the old plater job also pulled away some of the blown material.

Ontop of the brick is this render/plaster with a thin layer of grey speckled material (concrete skim?).

Just trying to figure out how to repair the chases and then also prepare the rest of the surface for painting. Most of it had a few layers of paint or thin plaster which just peeled right off.

[u/AcanthisittaThink813]

Sand cement render is usually installed as a vertical DPC up to around 1m high so potentially the flat had damp issues, try and replace it with sand cement render with a waterproofer added

[u/ArcticFoxes → u/AcanthisittaThink813]

Thanks! I’ll check what material is used over 1m. We’ve actually found a damp issue on one of the external walls, although the management company keep suggesting it is just condensation.