That is a carport style shop. Considering it's only 3in thick I'm very happy with it. My climate is fairly mild in the winter (25-30 degree lows) and pretty hot in the summer (105-110 highs) I installed the insulation in the summer and the temp in the building peaked at 128 degrees on a 105 degree day. After insulation I checked the temp inside the shop on the next 105 degree day and it peaked at 99 degrees. I should note this was at 10 ft from the floor so floor temps will be a bit cooler. This winter I have not recorded the temp swing like I did in warmer weather but the average seems to about 15 degrees warmer inside than outside at any given time.
More insulation would be great but for my purposes it keeps my shop at a workable temp all year and helps enough that heating and cooling on occasion are feasible. Plus I no longer get sweating and all my stuff stays rust free.