I am located in central North Carolina and getting ready to insulate my shop which is 30x70 w/10' walls. Wood frame with metal roof and walls (metal content = Morton building). I plan to blow R-49 worth of insulation into the ceiling. The building has ridge and soffit vents. A vapor barrier will be installed under the drywall.
My question deals with insulating the walls. I checked with a local insulation contractor and sprayed foam is WAY out of my price range. The wall thickness where there is no support structure is 7"; support structure cuts it to 5-7/16" in some places. R-19 insulation bats are 6-3/4" thick and designed for 2x6 studs. The last 2x6s I bought at Lowes were
1-5/16x5-7/16". Studs will be placed at a mixture of 16" and 24" spacing in the walls.I think I have two choices for insulating the walls.
- Use R-19 fiberglass bats and leave some air space against the metal skin.
- Fill the walls with blown insulation. The construction lends itself to horizontal "shelves" inside the wall at about the four and eight foot levels. Would these be enough support to keep the blown insulation from sagging/compacting over time? The only thing I have found on the WEB about blowing insulation into walls is "dont's do this yourself".
Suggestions?