Don't think ur gonna get through brick and cement with a multi tool, regardless of blade choice Plaster not a problem but then it's gonna stop.... Or you could say 'hit a brick wall' !! Multi tools are a brilliant bit of kit for so many jobs but this ain't one of them. The tool just hasn't got the power or hammer action needed Choose another method
Soft blocks, breeze blocks, celcon, etc then yep sure, can knock them out with a teaspoon But brick ?? Dunno..... How soft can they be ??
I've been putting back boxes in brick walls for 50 yrs now with a scutch chisel with no problem at all
My workflow is: Old Multi tool blade to make neat hole in plaster then sds chisel, finish off inner corners with scutch chisel. Multitool will get through some older brick styles like victorain/edwardian terracotta like butter. If the bricks are crumbling, then forget the sds and use just scutch chisel. If soft block then just use multitool throughout.
Thanks all Will save me some time. I don't do it every day and as I'm used to wood work I have tried to be a bit too precise. I should of allowed a couple of mm all around. A bit of a ball ache! As I only need to take off mm from the sides I'll try those methods cheers.
What about something like this: http://www.saxtonblades.co.uk/product_info.php/carbide-end-cut-blade-quick-fit-p-452 (Not used them myself)
Same here, Scutch chisel, plus I also have a SDS Scutch version, not quite 50 years here though.... Very good blades,whether sabre, jigsaw or multitool from Saxton Tools.
You can use chisel bits or scutch comb in the holder. http://shop.g-gibson.com/scutch-combs-1371-p.asp
Thanks all managed to get the back box in I was a bit rough and had to patch up where plaste edges had chipped, I used bonding plaster then a easy sand jointing compound come up really nice. Maybe skim would of been better than joining compound but I had time to sand back etc. Next time I will probably invest in the right blade and as scrutch chisel so some great info. Even tho job is done it took way to long but anyway I know now for next time.