image courtesy of energy.gov

Two strengths of the Power Shield roof system – energy production and energy efficiency, are components in the design of Net Zero Energy Buildings.

Energy is produced through the 16 watts of power per solar tile.   Building Envelope thermal performance (1) is improved through:

Cool Roof coatings on tile keep it cool and improve energy production.  The cool roof coating has high emissivity on the sun side to allow heat to be radiated out, and low emissivity underneath, making the tiles a radiant barrier;

The efficient Above Sheath Ventilation on the tile system provides a chimney effect as warm air flows between the tiles and the roof deck and out from the building.  In winter, the air gap between the tiles and roof deck are insulating, reducing the heat transfer out of the attic.

LEED points are also available from the recycled material in the metal roof and the reduction of the heat island effect.

1.   http://web.ornl.gov/sci/buildings/2012/2010%20B11%20papers/64_Miller.pdf