Single ply roof systems can provide an easy to install seamless roof assembly.
Roxul on roof.
Single ply roof insulation.
A few washer nails hold the comfortboard in place.
Known as comfortboard is this insulation has impressed us with its green virtues versatility and price.
An underlayment will be installed over the insulation and overhang and then the metal roof is installed directly on top of the underlayment.
The brief answer is that you can substitute semi rigid mineral wool panels for rigid foam in any roof assembly that requires rigid foam.
The walls are covered in two layers of 2 in thick rockwool.
The insulation planes with the roof overhang on the left.
The siding will also secure it.