Workshop ceiling insulation
Hello, insulation people
I have a 24x28 shop that I work out of, and just had a 24,000 BTU mini split installed. It is oversized for the space, supposed to cool 1,100 sq. Ft or something like that. The shop is 672.
The ceiling is not insulated, and I planned on doing that next, but I didn’t expect the mini split to fail quite as bad as it is at keeping it cool. Yesterday it was 90 degrees out and full sun here, and with the mini split running wide open it got up to 86 degrees in the shop. So, I want to quickly make a move with the insulation.
My question is, what the most effective way to do it would be. I have contacted several insulation places about it and they all seem uninterested in messing with it, maybe too small of a job for them. I really hate the idea of doing fiberglass overhead, and wondering if ridged foam board installed directly to the ceiling rafters, and possibly making a vented air space, would be good enough not to work the unit to death.
I would appreciate any ideas! Thanks.