My opinion is the best solution is the California corner (the 3 stud), but one stud can be made of short scraps of blocking (saving trees). Headers should not be box headers, they should leave a cavity to the inside. Then spray foam gives the best continuous envelope insulation.
My $0.02.
Do I need to insulate the interior walls?
I am planning on insulating myself to save money.
No.
Insulation in interior walls doesn't do much other that quiet sound transmission. I doubt you care about that in a garage.
SV reX said:No.
Insulation in interior walls doesn't do much other that quiet sound transmission. I doubt you care about that in a garage.
Well what is going into that room that he is making? How is he going to use it? How big is it? Will he be considering insulating the exterior walls of that room? Because if he's going to throw a window unit in, it could make a difference. Probably not worth it, but it is worth it to ask.
In reply to mtn :
You're right
In reply to mtn :
I am going to do A/C in the whole garage cause I am done working in the heat and cold. No idea how yet. I am planning on making another thread on that.
The two smaller rooms are going to be an office (9.5x11.5) and a gym (13.5x11.5). Main workshop will be 23.5x30ish ft. I will be insulating exterior walls and ceiling.
In reply to 93EXCivic :
Then I would insulate the interior walls.
You may grow tired of paying to heat/cool the entire garage at some point, and only want to condition the office. It will be hard to change later
In reply to SV reX :
Makes sense. Also probably would be good if my wife wants to use the gym and I am banging away in the garage.
When considering sound insulation, think "density of material". Standard fluffy insulation provides a little reduction, but adding another layer of a dense material like drywall will add way more sound reduction.
If are really interested in significant sound reduction, you can isolate the drywall from the studs with isolating standoffs. That may be going too far for your application. It will add a bit of cost, but will prevent sound from transmitting directly through the studs to the inside drywall.
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