First time post here for me.
I'm laying insulation this weekend. 2 layers - 100mm and 170 mm
Ceiling joists are approx 165mm deep.
What would you lay between the joists - the 100mm and leave an air gap between that and the 170mm that will be laid perpindicular to it?
Or would you lay the 170mm between the joists and cross-lay the 100mm
(or does it really matter?)
I'm just concerned about the gap if I lay the 100mm between the joists.