Flashing with traditional roofing materials is a difficult task. Unfortunately with older roofing methods, the joint between the roof and the protrusions will have seams, which are the main source of roof leaks.
Residential Roof Replacement/Installation
Foam roofing systems don't have this flaw, due to their seamless, monolithic nature that prevents air and water infiltration; as well as the fact that they are 'self-flashing.' This means that they can be applied to adjoining vertical surfaces in a contiguous manner. Therefore there are no seams or cold joints to worry about.
Spray Foam Closed-Cell Insulation installed inside a quonset style metal building, reduced movement, stopped air and moisture vapor transmission, and reduced exterior noise levels while seamlessly insulating the entire structure.