I havnt seen the light weight 5/8 come in fire rated type X ( 1 Hour). How much more $. To answer Kam, yes for sound and strength the makers claim.No they have a type x 1 hr fire rated light weight and a light weight that is only rated for 3 min. The type x is more money in ultra light
I haven't seen any 1/2 lightweight put up on a ceiling that was 24 oc. I think that is the main reason.Why have 5/8 lightweight that isn't fire rated when they have 1/2" lightweight for walls and ceilings?