beams 45*70 in a sloped ceiling 33 degrees.
planning to use gypsum boards 13*1200*2400 on these beams.

How closely should the beams be placed? is cc 60 ok?
How close should the screws be? one layer of gypsum or two layers?

Grateful for answers!
 
Thank you, no, no sound or special fire requirements.

Another question. Is there OSB or plywood for a ceiling height of 250 cm?
Unfortunately, it doesn't seem so.
 
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