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Cool Roof

Nov 09, 2006

Beginning September 1, 2006, retrofit low slope and steep slope replacement cool roof rebates for existing residential and mobile homes are available. Specifications vary based on the type of product purchased. The specifications below are for residential customers. Be sure to read all the information carefully before submitting your application.

Why install a cool roof?

Cool roofs keep your home cooler in the summer, reducing your air conditioning bill. A cool roof installation not only reduces your energy costs, you will also benefit from:

  • Lower energy costs compared to using conventional roof materials
  • Reduced air conditioning load
  • Lower maintenance costs on your roof
  • Increased life cycle on your roof
  • Improved occupant comfort

What is a cool roof?

Cool roofs are highly reflective and emissive materials that stay 50 to 60 degrees Fahrenheit cooler in the summer sun, thereby contributing to the reduction of urban heat islands and associated smog. The term "heat island" refers to urban air and surface temperatures that are higher than nearby rural areas. Many U.S. cities and suburbs have air temperatures up to 10°F (5.6°C) warmer than the surrounding natural land cover.

What is the difference between a low and steep slope roof?

Low Slope: A "low slope roof" is a roof surface with a maximum slope of 2 inches "rise" for 12 inches "run" as defined in American Society for Testing and Materials Standard E 1918-97.

Flat roofs generally have a small degree of pitch to them so that water will run off to a drain system and not pond. Thus "flat" roofs are classified as low slope roofs.

Steep Slope: Steep-slope roofs, or sloped roofs, are roof surfaces with a slope greater than 2 inches "rise" for 12 inches "run."

Rebate by Square Footage

There is a $ 0.10 per square foot for Tier 1 or a $ 0.20 for Tier 2 rebate offered for cool roof installation, depending on your specific roof requirements. This roofing material offers a great energy savings alternative compared to the conventional materials and will assist in reduction of your air conditioning load.

Ask your contractor to convert the "roofing square footage" into the actual square footage and indicate this information on the final invoice. A roofing square typically measures ten feet by ten feet square that equals 100 square feet (10 x 10 = 100 square feet) of a roofs surface area. This is an option that will be helpful in determining the square footage of the roof area.

Rebate Level and Product Specifications

The below table can help you and your contractor determine which rebate you qualify for and your contractor can advise you on which cool roof product is best suited for your home.

Roof Type Tier Level Initial Solar Reflectance* Initial Thermal Emittance* Rebate
Low Slope N/A ≥ 0.70 ≥ 0.75 $0.20 per sq. ft.
 
Steep Slope Tier 1 0.25 - 0.39 ≥ 0.75 $0.10 per sq. ft.
Tier 2 ≥ 0.40 ≥ 0.75 $0.20 per sq. ft.
*Note: Initial Solar Reflectance and Initial Thermal Emittance specifications must be rated by the Cool Roof Rating Council.

To Qualify:

  • You must have electricity distributed by PG&E to the installation address.
  • You must have a central air conditioning system (portable A/C systems and evaporative coolers a.k.a. swamp coolers do not qualify).
  • Your home must be in climate zone 2, 4, 11, 12, or 13. To determine if you live in an eligible community, check the climate zone map.
  • Purchase and install roofing materials that meet the Initial Solar Reflectance and Initial Thermal Emittance specified below as rated by the Cool Roof Rating Council. The Cool Roof Rating Council maintains a complete list of products on their website, www.coolroofs.org.
  • Steep slope roof products must have an initial solar reflectivity of 0.25 or greater.
  • Low slope roof products must have an initial solar reflectivity of at least 0.70.
How to Participate:

  • Download an application package or call the Smarter Energy Line (SEL) at 1 (800) 933-9555 to request an application package.
  • Contact a licensed C-39 contractor of your choice to provide an installation proposal for the qualifying product. You may wish to contact more than one contractor to obtain multiple proposals. You can contact the Contractors State License Board, CSLB, at 1 (800) 321-CSLB or go to their website, www.cslb.ca.gov, to confirm your contractor's license status.
  • Inform each contractor from whom you obtain a proposal that you will be applying for a PG&E rebate and must choose qualifying products in order to participate.
  • Visit the Cool Roof Rating Council website for a complete list of qualifying products.
  • Ask your contractor to help you estimate the total square footage of roofing. Conventional architectural overhangs are allowable in this calculation.
  • Sign and submit the original application form(s) and all required documentation.

 

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