An underlayment will be installed over the insulation and overhang and then the metal roof is installed directly on top of the underlayment.
Roxul on roof.
The insulation planes with the roof overhang on the left.
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 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.
The siding will also secure it.
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.
Single ply roof systems can provide an easy to install seamless roof assembly.