Roofing Accessories Roof Curbs Roof curbs are used where ventilation systems need to be installed on a roof. Our Roof curbs are custom made to order in a variety or profiles, colors and dimensions. Brochure Downspouts These hand laminated accessories are used to drain water collected by the gutters on a roof. They are commonly fabricated in standard diameters of 4,6,8,inches but can be customized to your requirement. Brochure