By the Division of Professional Licensure

Commercial / Industrial Metal Watershed Roofing System- Definition:

Any flat seam, flat locked and/or soldered seam, standing seam, batten seam, horizontal seam, custom designed or prefabricated metal roofing and related components (flashing, trim, gutters, downspouts, conductor heads and scuppers) that are interconnected to the metal roofing system with mechanical fasteners or locks and seams and are installed on projects that are deemed non-residential per 271 CMR.


Residential buildings as defined in 271 CMR

Through wall flashing

Gravel stops


Soffits and fascia

Gutters and downspouts that are not interconnected and fastened to the metal roofing system