How many bags of plaster do I need per m²?
One 25 kg bag of multi-finish covers about 10 m² per coat, so measure your wall area and divide by 10 — a 45 m² room needs roughly five bags. Bare brick also needs a bonding undercoat at 2.7 m² per bag.
- Buy one spare bag; running out mid-wall shows in the finish.
- Bonding coat is a separate material from multi-finish.
- Materials are normally quoted separately from labour.
Need this done by a local plasterer?
plastering cost guide for SwindonNext question: Can you plaster over wallpaper?