plaster arch formers

[Chanman]

I have removed door frame in kitchen & am left with opening which I intend to convert to archway using formers already purchased from wickes. I have timber lintel above frame 100mm wide, overall wall thickness is 150mm thick. The instructions state nose should e 13mm proud of surface Do I attach formers to timber lintel and trim them to 100mm wide or should I nail some lengths of batten 126mm long centred across lintel and attach formers to ends of batten thus when plasterer plasters, 13mm would go behind mesh & final coats would build up to existing plaster on outside of mesh making arch flush with existing wall.
Any advice appreciated

Thanks

 

[dazdel]

Hi chanman, let the plasterer fit the arch, if you make it too tight against the head and the face/reveals, he will struggle to get his angle beads on. This will result in starting again, make sure he is a plasterer and not a skimmer

 

[joe-90]

Are you really sure you want an arch? They are so 80's .