@Dave-1 Thank Dave. Its definitely brick, I've drilled through some other parts of my house to mount cupboards to walls. Did you have a suggestion ...

Thanks for the response. Do you have a suggestion for how to fix it once I've got it tested?

Thanks Mitchell, I am going to use corrugated sheets (something similar to this https://www.bunnings.com.au/fielders-s-rib-corrugated-steel-cladding-2 ...

Really helpful blog. I've got a similar flashing to install but mine is longitudinal to the roofing so I won't have the foam infills (and I'm using me ...