Cool Roofs in hot climates can help reduce air conditioning loads, which in turn reduces emissions associated with fossil fuel-generated electricity used for air-conditioning.

A roof with a lower solar absorbance will reflect more heat than a roof with a higher solar absorptance, and will keep the roof space and dwelling cooler on a hot day.

Find the Cool Roof options in the Attic recommendation details. Each Attic added to a job will have it’s own cool roof detail section.

Roof Absorptance:
Solar Absorptance is equal to (1) minus the Solar Reflectance. For example, if the Cool Roofs rating council website gives an initial Solar Reflectance of 0.27, enter 0.73 for the Roof Absorptance.

Roof Emissivity:
List the Thermal Emittance (or Emissivity) of the roofing material per the manufacturer. Most EE programs request that you use the 3-year aged factor instead of the listed initial factor.

Sample data from Cool Roof Rating Council / http://coolroofs.org/products/results

ENERGY STAR Certified Roof Products

Sample from Energy Star ratings / Energy Star / Owens Corning

Use these product finders above to find your improved cool roof values.

BASE VALUES
The current base values for Cool Roofs in Snugg Pro are from HERS standards, which apply only to dark roofs.

Keep in mind that darker roofs have a higher Absorptance number.

The below values are from FSEC:
​Energy-Efficient Roof, Ceilings and Attics

Additional Reference for existing roofs
​Table 8 in ASHRAE HoF 17

Additional references for cool roofs:

California Advanced Home Upgrade:
Roofing materials must meet or exceed: 1) the Aged Solar Reflectance and Aged Thermal Emittance levels; or 2) the Solar Reflectance Index (SRI) ratings specified below and confirmed by submitting the Cool Roof Rating Council (CRRC) rating (coolroofs.org).