I have a project with a very curvy roof. We want to put the insulation on the exterior of the structure so as to showcase the structure in the interior. The contractor wants to use spray foam as the exterior insulation, but I understand that spray foam is quite toxic. Is there any other option for exterior insulation that could curve with a curvy roof? All I could think of was rockwool, but is it advisable to be used on roofs? does it need to be kept from getting wet from rain/snow?

Topics: architecture, construction, building, green, materials, insulation, sustainability