Insulation in Double Studded Walls

[djgizmo]

I'm in the process of building a double studded framed room, however I'm unsure how much insulation I'm supposed to be using.

My room is in a garage which is on the west side of the house, so I don't get a lot of heat till about 4pm(ish) which then starts to bake the garage till sundown.

Should I only use one layer R-13 on the inside of the outside sheetrock wall, or should I use 2 layers? Will I experience any heating/cooling benefit with more than 1 layer?

Thank you!

[xaMdaM]

It really depends on the studs and air gap...

2x4 studs w/1" air gap - R13, or R15 (if you can find 3-1/2" R15)
2x4 studs w/2"-4" air gap - R19 (but it's gonna be real tight)
2x6 studs w/1" air gap - R19

And this should be the insulation in each stud wall.

Generally, the insulation should be pink facing pink in the air cavity. Also, you really do want that dead air space between the studs to have at least 1" of air. That way, the air column is able to act as a spring.

If they are touching a little, it not gonna defeat the whole thing, but you don't want to cram the studs so full that there is a firm surface from one wall to the other.

Make sense?

[djgizmo]

Makes perfect sense.

Thank you for taking the time to help!

[davew]

use ridged fiberglass and be done with it! better for taming bass freq's as well!

[bpape]

Use standard fluffy in both cavities. You'll not have transmission issues and you'll get better damping and better heat insulation.

Bryan

[djgizmo]

Originally Posted by bpape

Use standard fluffy in both cavities. You'll not have transmission issues and you'll get better damping and better heat insulation.

Bryan

Yea, my main concern was heat insulation since I'm in Florida and the room will be in the garage (even though I'll be running an ac line to the room).