Insulating a metal shop?

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ESP47

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I recently got my 30x50 square tube metal shop put up and am currently going through sticker shock on insulation. Not only that but researching it is making my head spin. It seems like no matter what I read, everything is always wrong with every form of insulation. I'll admit I have zero experience with this topic.

I'm much more concerned with keeping the heat out during the summer than I am keeping the heat in during winter. We have hot summers and mild winters here. I'm looking at polyiso foam board at Home Depot. 1 1/2" thick at an R value of 5.78. Was thinking about applying a double bubble radiant barrier to it while keeping a 1/2" gap between the foil and the metal siding. Would probably cost around $3-3.5k. What scares me is potentially spending all that money, doing all that work and having it still be hot as hell during the summer.

www.homedepot.com

R-Tech 1 1/2 in x 48 in. x 8 ft. R-5.78 EPS Rigid Foam Board Insulation 320817 - The Home Depot

Visit the Home Depot to buy R-Tech 1-1/2 in. x 4 ft. x 8 ft. Foam Insulation 310880
www.homedepot.com


Does anyone have any recommendations?
 
spray in foam

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Insulation on metal buildings is brutal. I just put one up and put a door on each end for flow through ventilation ! And will have a big fan when it gets hot. Not t mention they suck to finish out on the inside.
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Is/are the frame (studs, joist, etc) metal, as seen in the pics above, or just the panels and roof, like mine seen here?

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I have a friend with a 40 x 60 I believe it is. He had it spray foamed. I'm tellin you now, if there's any way in heck you can get the money up, do it. Here in middle Georgia it gets HOT in the summer. We saw almost a 15 degree drop in air temp inside his building.
 
Anything would be better than nothing, though those metal studs will still conduct some heat to the interior. For an example, I insulated a metal garage door that sees direct sunlight to help keep my garage cooler in the summer. I used foam boards similar to the ones posted in post #1. It helped a lot with heat transferring from the door panels themselves, but the door frame members still get warm to the touch when the sun is beating down on the outside of the door.

Does the shop receive direct sunlight? If so, each on of those metal studs will be a longer heater on sunny days if they're in contact with the outside panel unless you somehow insulate those as well.
 
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