I hope you can help.
I have a 21' by 21' two car garage that I want to insulate and drywall. The problem is that the ceiling only has 3 Collar ties. I have priced installing more ceiling joists to fasten the drywall to but it is expensive.
I would like to find a less expensive solution to insulating the garage ceiling. I have two other options I am considering and would like your comments on.
- Could I just insulate the roof joists, with 3" paper barrier insulation, the joists are 2"x6" 16" OC. I would maintain a gap between the roof sheathing and insulation for air flow.
- Install 4'x8' by 3" thick rigid foam insulation. Fastened to the bottom of the roof joists.
HERE IS MY QUESTION!
Does code require something over the insulation (Drywall...Plywood) or can the insulation remain exposed and pass a building code inspection. I understand local code is different by locality. I am interested in national and your experience with your local codes as many are similar.
Your comments will be appreciated.
Thanks in advance