I have a bonus room over my garage. The bonus room has knee walls about 5' high on both sides, and a vaulted ceiling. I am planning to build cabinets in the walls to use the space behind the knee walls for storage.
Currently, there is pink fiberglass insulation below the finished room, in the knee walls, and in the ceiling above the room.
I'm seeking advice as to how I should plan to insulate when I put these cabinets in the wall. The cabinets will be stepped, with a 12" deep section near the top and a 24" deep section for the lower shelves.
My first thought is to insulate the space which will contain the cabinets. I think this would involve continuing the air baffles (is that the right term?) from the roof vents all the way down to the eaves, then continuing the fiberglass insulation in the rafters and in the floor joists.
This image is looking "up" the rafters towards the peak of the roof:
This is looking toward the eaves:
This attic space extends the depth of my house, maybe 40'. I plan to put the cabinets in the portion of the bonus room which is the front 12' of the space. I suppose I would either need to insulate the entire space, or build an insulated wall in the attic to enclose the section with the cabinets.
I have not done any insulation work before, so I have a general idea that I need to be worried about a vapor barrier and fire safety. What else? Am I headed in the right direction?
I live in North Carolina where we are dealing with heat and humidity for much of the year and the temperature rarely goes into the 20's or below.
Thanks for any advice and tips!