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[hbthefirst]

What is the material on the brick wall?
I'm looking to replace it but not sure what is it is.
I was thinking plasterboard but appears too thick for it to be plasterboard

[stoneyboy]

Hi hbthefirst,
It could be any of the base coat plasters, most likely browning if it's an old wall, hardball if it's relatively modern.
Try scraping it with a screwdriver, if it is very soft it's browning.
Regards S