My kind of iong story so skip it if you wish...
I had a basic idea of what I wanted in my 28x40x12 garage back in 2009 (during the mortgage crisis so a lot of people were not too busy) and took my general plan to my local building supply company. They drew up the plans on autocad for me for $100 (and applied the $100 to my first lumber purchase).
My local excavator guy was a huge help. He knew everyone. He pointed me to the good concrete guy, the good electrician, and the good paver guy for the driveway. I wanted good guys and was willing to pay them to do good work. They all did without exception.
It helps to have a good concrete guy. The guy I used was used to doing commercial buildings and my job was so small he did it in his "slack time" and gave me a deal since I was not in a big rush. He able to get the 8" thick stemwalls (4' deep for me) on 24" footers level and square. He was right on the money for square and within about 1/4" for level. That was good.
My carpenter guy (a buddy) had never put one together before, but he and his teenage helper guy and me sometimes did it all without a crane. In a week we had the "box" up and secured. The panels were only about maybe 200 pounds each and were basically 4' wide x 12' tall.
A PT 2x8 was screwed to the top of the stemwalls and a 2x6 was screwed to that. My SIPS were sort of grooved to straddle those 2x6. My panels used a "cam" to sort of lock them to the next panel. Lots of construction adhesive, spray foam between panels, and big nails. 2x6s screwed together locked up the corners. On top of the SIPS another 2x6 locked them together from the top and another 2x6 on top of that for the tusses. Again lots of construction adhesive and nails. LDLs beams were used over my 2 8x8 garage doors.
The guys who built the trusses delivered them to the roof for an extra $100. Money well spent.
My ceiling SIPs hang from the trusses (with more adhesive, spray foam and screws, and that really tightened up the whole building. The actual roof is cold though and has soffit and a ridge vent vents. I put sheetrock on the bottom of the ceiling panels and painted it white. My interior walls are all 1x8 shiplapped pine that I put poly on because I wanted it that way. My exterior uses pine log siding stained to of match my cedar log house. It works.
My shop is sort of over built though. I beefed up the roof trusses from 2x4 24" OC to 2x6 ones 16" OC. I used Advantek plywood roofing 5/8" thick vs 1/2". I wanted it to be strong and for me not to worry about snowloads. It is quiet also since I live with close neighbors.
I paid about $20K for the high quality SIPs delivered. They are likely more than that now but I would still do it again that way.
I have radiant floor heat in there on top of 6" of 4000 psi insulated concrete and it stays very comfy all winter and summer. For cheap money heat.
The big savings for me using SIPs over stick built is that they are all built in a factory where everything is controlled during the construction process. Everything was delivered to my jobsite on one semi in about 4 weeks well packaged. All of the adhesive, spray foam, big screws, etc. and instructions came with it. My big savings were in the labor to make it happen quickly and there was very little waste for me to deal with (at $120 per ton). Even here in Maine it can be tough to find really good quality lumber stock even though I had a really good local lumber company to work with and they did very well and saved me numerous times.
My wife's next husband will be impressed.
Sorry that was so long.
