Nogging pieces for fastening boards?

[messe]

Do I need to cottla between the wall studs at the ceiling to screw the sheets? Used cc600 and on top of that will be chipboard and gypsum. There's always something that has been missed...

 

[imported_jo]

Hi, I had the same in my vacation house that I built this summer, I toe-nailed a stud between at the same angle as the roof slope, so you have something solid to attach the OSB board to. Similarly up in the ceiling. A bit tricky but it's worth the effort.