Most of the room I have been able to double drywall without obstructions at all. In the back right corner, the mini split line set comes down the wall in the stud bay, but then juts out and across the face of the studs. They stick out just far enough to have to notch the first layer of drywall around them. The hat channel just isn't deep enough.
The second layer of drywall does just fine, straight down to the floor.
So the conundrum is ... is a single layer of drywall (decoupled with clips and hat channel) sufficient for like 6" high and 7 feet long? Or do I attach a second layer of drywall along the bottom 6 inches?
There is also a riser going in. I believe the riser goes up against the back wall - no additional decoupling, correct? Can I just effectively use the perimeter 2x10 as the second layer?
Reading the stuff I've found on the forum, even back the 2003 Erskine article that is oft quoted, I see a 1/4" separation with insulation jammed in the gap, but I've seen other designed where the riser is firmly attached to the channels on top of the decoupled drywall.
1. Bolt the riser to the channels on top of the decoupled drywall
2. Add a 6" high pieces of drywall as a second layer and butt the riser up to it
3. Leave is as a single layer
Any thoughts? Sage wisdom here may save me some rework in the coming months ...