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Stick to the 6x3 size unless you're a giant or have some experienced help. 8x4 doesn't float in the air very easily :)
Lath and plaster is a bitch, sometimes a sharp multitool will cut the lathe instead of just dislodging it from the plaster. Sharp box knife is your friend when cutting plaster especially if you don't have a multitool. Stanley Fatmax saw is quite useful, drill a hole and cut :-
It's a savage piece of kit, never let it near your skin.
2 questions if I may
I’ve decided to board the ceilings downstairs now To get a better finished. Is there a particular size width to go for? I was going to use 12.5mm? And is there a way to determine what size boards to use to avoid wastage?
And can anyone give me a guide in how to chase a lath and plaster stud wall for a back box