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Are timber battens half and half overlapped at the supported edges good enough or do they need to be attached to the joists too.
I quite often use backing strips, thin pieces of steel (i think). Basically when you are fixing the board you don't put screws sown the edge of the board that the next board is butting to. When the board is fixed, slide the backing strip under the back then screw the board to the joists , screwing through the backing strips, once you have fully fixed the board you can then add screws between the joists for extra strength.
Bobbo
Cheers @TooTallTim and @Bobbo . I'm confused about why boards need to be perpendicular to joists though? I'll end up with far more unsupported edges that way vs if I run them parallel. Are timber battens half and half overlapped at the supported edges good enough or do they need to be attached to the joists too.
I'll have a second person helping me. Was planning on just using a drill driver and one of those drywall bit holders to get the screw depth correct. I'll be doing the job bit by bit over a couple of weeks or so don't really fancy hiring any equipment. I was going to make a couple of T shaped upside broom things to help wedge the boards in places while I drive the screws in.