There is one entire wall in my shop that has 3 1/2 inch R13 insulation, and it's covered by 1/4 inch peg board. There is also a layer of radiant barrier on the inside of that wall which is 3/4 ply. That makes it R17. The ceiling has about 6 inches, but that insulation is sealed in with 2 inch thick foam with a reflective coating on the inside. I also have radient barrier (Bubble type) just under the roof, which keeps heat out in summer, heat in in winter. I think it took about 2 days to get all the insulation in.
The ceiling in the garage has 6 inch (R38) that was put in by a professional crew, with blown in insulation in all the walls. The ceiling was done in a couple of hours, including putting in the radiant barrier under the OSB roofing. The same crew also installed venting so there's air flow into the area and a powered exhaust fan so if it gets more than 120 up there, it changes the air.
I found that having a good powered staple gun makes installing insulation much faster and easier.
I've mentioned it before, but we did a IR heat check comparing the bare OSB to the radiant barrier covered side and there was about a 35 degree difference. Out here in the Mojave, that counts big time. I mention the details because, while we don't get condensation and mold problems here, where you are Rick, that attic ventillation is likely to be necessary.
I bet you could have that insulation fully in with about 4 evenings of work. Install one wall per day, and then the ceiling. Get the stuff in and worry about the wall materials later. I think you will seriously regret putting your new CNC through a winter of freezing in that ice box.
Tom I stored all the cnc stuff in the basement. Thought I’d assemble it when the garage is complete inside ,which may be never if this new job turns out .
I thought I’d try and get some part time work ,as that would give me time to work on my house and shop .
But in a strange turn of events , one of our main contractors just crashed his quad breaking his leg and also receiving some spinal damage .
So now they want me full time . This will be a lot more work than I’m used to , and I suspect I’ll be pretty much bagged when I get home . But if I’m working out of town , the shift is 8 in and 6 out ,and that would free me up .
I could certainly use some decent income for the time being , as I still have way to high of a mortgage .
Things change rapidly around here , so I’m going to make the best of it and save as much as I can for now , as you never know what tomorrow brings .
I’m hoping this works out till I’m at least 60 ,which is in April 2021, then I can apply for CPP early .
Maybe hard work will get me in better shape and I’ll really enjoy this job and stretch it till I’m 65