Black Roof Energy Efficiency

Learn how a product earns the label.

Black roof energy efficiency. There are different cool roof standards for commercial low slope roofs and residential steep slope roofs. Roof products key product criteria. So in 1999 the u s. 1 cool your roof cool roofs are lighter in color than traditional black asphalt or dark wood shingles and save energy by reflecting light and heat away rather than absorbing them.

Energy star certified roof products can help reduce the amount of air conditioning needed in buildings and can reduce peak cooling demand by 10 15 percent. Product energy consumption and performance can be measured and verified with testing. Modern energy efficient metal roofing acts as a giant mirror of sorts by reflecting the heat and energy up into the air. How they can be made cool.

This is known as the albedo effect and many studies have documented significant energy savings from simply lightening the color of a roof. Labeling would effectively differentiate products and be visible for purchasers. In today s market a cool roof is defined by the reflectivity and emissivity requirements set by either title 24 from the california energy commission or by the energy star program. Single ply membranes are pre fabricated sheets rolled onto the roof and attached with mechanical fasteners adhered with chemical adhesives or held in place with ballast gravel stones or pavers.

However the black roof heated the air within 5 inches but there was no difference in air temperature impact for black or white roofing beyond that distance. Built up roofs consist of a base sheet fabric reinforcement layers and usually a dark protective. From leed the cool roof rating council and energy star program all the way up to the u s. Environmental protection agency s energy star program began rating roofing materials for energy.

In california they have been part of prescriptive requirements of the title 24 building energy efficiency standards since 2005 for all new nonresidential flat roof buildings including alterations and additions. Department of energy there is widespread belief that white reflective roofing systems even on buildings in northern cities like new york and chicago are more efficient and more cost effective than dark roofing and that these systems also reduce global warming and the heat island effect in which. Energy efficiency can be achieved through broadly available non proprietary technologies offered by more than one manufacturer. Florida solar energy center and while asphalt tiles don t have the power of a magnifying glass.

The hotter the roof the more energy it takes to cool the building beneath it. A white or light colored metal surface reflects best under testing at about 67 percent reflectivity and even some newly developed cool colors send the rays away source. Solar reflectiveness affects energy. Cool roofs have been proliferating.