Sticking insulated cement board to rsj

hail hail

Private Member
What's best method of sticking some cement board to an rsj.

Have to board and plaster around a double sided stove. Ive screwed metal stud and cement board to the inside walls. There's this small section around the rsj that needs boarded to hide it, but wondering what's best method to install the cement board. Was thinking drilling few small holes in rsj for screws but is there any quicker methods thatll save me drilling.
 
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