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If you keep at it with a sharp 25mm+ chisel take off anything that's not bonded and use Fibrex / Murex for filling/facing you should be able to avoid removing anything that's bonded to the brick.
Often you'll take off 10-15% in chunks especially from around cracks that often go through the cement to the brick on surrounds.
You might still remove quite a bit but you can deep fill with those fillers.
I know the heritage methods guys will burning sand to make mastic etc. but I'm not seeing failures over 15 years with the methods I've used so I feel confident that they have some merit.
The area above the window is often way more solid, you'll be unlikely to crack large chunks off in my experience.
Airhead
chrisbmx116
I’m kinda into that idea too but fear having to strip it all properly.
Will have it as an option depending how it all goes.