dunno mate, on a cavity i wouldnt agree but ive done a couple on a 9" solid, get the course right underneath the headers, 2 course out, 2 course engineerings back... outside only though... dunno who done the inside, bit of cash work years ago...
I see then it's below the header on 9" solid wall. I know they just pack them back up with slate you would think useing an epoxy grout of some sort would be better long term.
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