Thanks for the replies. The board around the wood burner is non-combustible cement board installed by the HETAS installer and meets all the regs.
@Monkey Boy I’m tempted to give it a go to see what happens. Still not sure about the arch though.
It’s my first post on here and I’m hoping someone will be able to give me some advice about plastering a chimney breast.
Just had a new wood burner installed after having the original open fire taken out and chimney breast opened up. We have discovered the chimney opening is arched...