I’ve done a little more research during the weekend and I think the current trend is closed cell foam insulation with Hardie 4x10 sheets and 1x3 trim to cover the joints -like a board and batton pattern.  

@Wendy S. Have

You can  shave a grand off of them, and you have horrible reviews, or just let it go and they will praise you for it...It's a tough one..

If a 15 year mortgage shaves a 1/4 percent off your loan, but decreases your money available to save and invest, then maybe it is not such a great deal. 

It looks like someone tried to patch with cement and foam.

A silicone caulk, some type of expandable spray foam, or mortar?

But he basically used a spray foam dispenser to areas which had largergaps and used a special sealant to seal it.

I also added a 1.5" gel foam topper and a Serta waterproof cover over it all.

We used closed cell foam for the insulation and had a custom roof system fabricated out of aluminum trusses and coretin, in addition to having a porch on the south side of the container, all of which have mitigated any heat transfer. 

At the end of the day, its not about shaving off the last 10 basis points, but instead it is about actually closing the deal.