Black Roof Energy Efficiency

How they can be made cool.

Black roof energy efficiency.

Modern energy efficient metal roofing acts as a giant mirror of sorts by reflecting the heat and energy up into the air. There are different cool roof standards for commercial low slope roofs and residential steep slope roofs. Reformulate or coat black membranes to make them reflective. The energy star energy efficiency criteria do not include a specification for roof insulation.

Roof products key product criteria. They are used in about two thirds of new roof or re roof installations in the western u s. 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. Built up roofs consist of a base sheet fabric reinforcement layers and usually a dark protective.

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. 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. Energy efficiency can be achieved through broadly available non proprietary technologies offered by more than one manufacturer. This is known as the albedo effect and many studies have documented significant energy savings from simply lightening the color of a roof.

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. Labeling would effectively differentiate products and be visible for purchasers. So in 1999 the u s. 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.

Environmental protection agency s energy star program began rating roofing materials for energy. Product energy consumption and performance can be measured and verified with testing. 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. 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. 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. Solar reflectiveness affects energy. From leed the cool roof rating council and energy star program all the way up to the u s.