Technical Bulletin: INSULATION ALERT!!!

Algae Discoloration of Roofs

For many years, roof discoloration caused by algae has been observed throughout the United States and Canada. The discoloration usually has a brown to black appearance, and may be mistaken for fungus growth, soot, dirt, moss, or tree droppings. Gloeocapsa magma is probably the most prevalent of several algae species that contribute to discoloration. All […]

Photovoltaic Systems and Asphalt Shingle Roofs

Introduction Photovoltaic (PV) systems convert sunlight into electricity. These systems have been successfully installed on residential asphalt shingle roofs for many years. The two common attachment methods are rack-mounted and roofintegrated: The latter method is sometimes referred to as building integrated photovoltaics. Framed rigid PV panels/modules are commonly mounted on racks attached to the roof’s […]

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