I am sound insulating the ceiling between the joists with mineral wool. I am thinking to use either 45k/m3 or 60k/m3 density mineral wool. The joists are set 30cm apart so I will have to cut to size the mineral wool to fit between the joists. What density will be easier to:
1. Cut to size?
2. Fit tightly between the joists?
1. Cut to size?
2. Fit tightly between the joists?