Single ply roof insulation.
Roxul on roof.
The more extended answer is that while this approach is fairly common on flat commercial roofs especially in europe it is almost never done on sloped roofs especially in north america.
Single ply roof systems can provide an easy to install seamless roof assembly.
Made in canada by roxul comfortboard is one product in a line of stone wool products that combine the power of rock with the characteristics of insulation wool.
Known as comfortboard is this insulation has impressed us with its green virtues versatility and price.
The walls are covered in two layers of 2 in thick rockwool.
Rockwool multifix is a mineral fiberglass faced stone wool product that can be installed under many single ply membranes.
The siding will also secure it.
The insulation planes with the roof overhang on the left.