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Special hemmed edges

Hemmed edges are used on most metal flashing systems. The hem or fold makes the flashing strong at the hem and helps control water flow. The hem can be turned up or down. Hems turned up are used at the high edge of flashings around roof penetrations, such as skylights, soil pipes and chimneys. Upturned hems are also used on the roof side of continuous sidewall flashings and on the vertical edge of open metal valleys. An upturned hem creates an air gap that resists the capillary migration of moisture from the metal to the roofing. They should never be hammered flat. Upturned hems also serve as hooks for attaching cleats. Downturned hems are used when flashings are lapped over the top of roofing or other materials, such as skylight glass.

The production of colored granules is basically a process where the blended stones with different sizes are coated with a combination of organic and/or inorganic pigments similar to paint. The pigment mixture, once applied to the stone, is baked on at high temperatures causing the pigment color to be fused to the stone in a ceramic process. The selection of the type and quantity of pigments utilized will determine the final appearance and color of the granules. Once the roofing granules are cooled, they undergo a rigorous set of tests to certify the quality and longevity of the product.