I had to completely reomve a section as it was attached to a stud wall built by a creting. It is a long thin area. 2.4 metres by about 80 cm which is the whole area.
Can you clarify?
So is this the whole area, ie no other boards butted up to or going to be joined when you make repair?
or is the area part of an existing wall and you are going to have to butt/join up to other boards on the wall?
If this section is part of an existing wall surface, are the boards on that wall plaster finished or not?
Do you now if the board you removed is 9.5mm or 12.5 thick, not including any plaster on it's surface or could you tell us the depth between the stud work and your finished wall surface?
I ask these question because if wish to avoid plastering you will the replacement close to level, ideally with a tapered edge on the joints, if the joints are not in either external/internal corners.
May I add, there is likely to be no cost or time saving using a joint taped method, over a plaster finished method.
Joint tape method will involve:
taping joints
applying joint compound (three applications at different widths over tape)
sanding down (after each application)
priming surface for decoration