staggered studs insulation detail

Hi Folks, I've got a 10'x20'x9' garage that is being converted to an office with anticipated future use as a control room adjacent to a 20'x20'x10' studio. I'm trying not to do anything now I will regret later if/when the studio materializes. So first question: The existing outside walls are 2x4 16" oc, sitting on the outside of a 2x6 bottom plate, which is atop a poured concrete perimeter foundation. I am thinking of adding staggered 2x4 studs to the inside of the plate midway between the existing ones. The question I have is what would the recommended insulation detail be? Haven't seen the answer to this in Rod Gervais' book or anyplace that talks about staggered studs. One or two layers of R13? Should I be concerned about compressing 3.5" insulation down to 2-2.5" around the alternate studs? James

I got whatever R value says it's for 5-1/2" walls, pretty sure that's R-19. I made a slit lengthwise down each 8' piece so that when I place the insulation and stapled the paper to the inside studs, the cut insulation straddled the outside stud. However, if I had it to do over again, I would probably get the R-13, half of it faced and half unfaced. I'd work the unfaced between the outside studs and then staple the faced to the inside studs like in normal construction. That would be a bit more expensive, but probably easier to do than having to cut each piece. For that, 7" of insulation would be compressed to 5-1/2".

"I've got a 10'x20'x9' garage that is being converted to an office with anticipated future use as a control room adjacent to a 20'x20'x10' studio. I'm trying not to do anything now I will regret later if/when the studio materializes. " Your issue is not the insulation, or what R factor...the issue is, in one room you have dimensions that are multiplies of each other, in the other, it is a square room WITH multiples. You are no where near ready to add walls, let alone insulation.

follow Brien's advice and rethink your room dimensions, isolation requirements, budget, workflow, etc because you are throwing away money with your current approach.