Hi Audi;

How much time is the building going to be heated and to what temperature?

I am questioning the cost-benefit of insulating at all. Most of the cost of heating a house is the 24 hour a day 70 degree temperature. The fuel needed to occasionally heat a small space to a 60 degrees may not justify the cost of insulating.

I have an unheated, uninsulated, part-time shop, but I admit the cold temperature discourages me from working if I have a choice. I can run a kerosene heater as needed. I take the work to my basement (55 degrees) if I need to glue or paint it.

My point is that it does not take nearly as much energy to temporarily heat a space than to heat it full time so the need to insulate a shop/garage may not be justified.

Jim