400 wide alternative to RWA45

[ChrisZx]

Our drawings spec RWA45 between 400c/c joists - great, RWA45 only comes in 600.

Whats the best alternative? I've seen a few that would do it fine, like Rockwool flexi slab, but it's something like 60% more expensive despite looking exactly the same.

 

[foxhole]

Rolls usually come semi split so you get 400/200 on a 600 roll .

 

[ChrisZx]

I thought the rolls were less dense? Are they a suitable alternative? I'm not sure the sound insulation would be as good