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It will be office space, man cave, play room, etc. So, heated "living space", but not an apartment. My town would require a special permit for an apartment/bedroom. I built the slab with radiant tubing so I could add heating in the garage in the future. So I plan to have it heated at some...

I intend to turn the attic into living space at some point. What do you mean by ceiling material, the ceiling of the attic or the ceiling of the garage?

Top chord is 2x10s. I could do 7.5 inches of sprayed foam and leave 1.5 for ventilation. That'd give me R49 from knee wall to the ridge, right?

My goal is to first and foremost understand what R-values are required in Mass (in trusses, knee walls, attic ceiling, and even garage ceiling-other than below the attic subfloor), assuming we don't insulate the walls in the garage. Funny enough the garage doors will have a higher r-value 18...

Thanks. All good ideas! I do have a vented ridge and plan to drill holes in the soffit to allow for ventilation.

The idea is to insulate in between the trusses, in the attic. I just don't know how much do I need.

Perhaps 2 more pictures help...

Hi I've built a detached 3-car garage and I'm trying to understand the insulation requirements to have it heated. It's 50 by 30 and has an attic space of 600 sq. I've built it with trusses. It's 11ft in height and logs provide an R8 value. I've tried using rescheck to understand the attic/roof...

Also it's not a mono slab. There's foundations with footings for the walls.

Thanks for your comment. The heaviest load for my would be my Toyota tundra or similar kind of truck, 5,480 lbs. Did you mean to include a link?

I'm building a detached garage with a radiant heat floor, and currently deciding on the design of it. Initially I was thinking of pouring 8" of concrete on top of 2-inch 25-psi insulation foam boards, with reinforced steel mesh and chairs to lift the PEX about 2 inch up from the boards. However...