SIKA CORPORATION • ROOFING 100 Dan Road • Canton, MA 02021 Tel: 781-828-5400 • Fax: 781-828-5365 • usa.sarnafil.sika.com

COOL ROOFING SUMMARY Definitions:

Solar Reflectance – a measure of the ability of a surface material to reflect sunlight – including the visible, infrared and ultraviolet wavelengths – on a scale of 0 to 1. Solar reflectance is also called "albedo."

Emittance – refers to a materials ability to release absorbed heat.

Solar Reflectance Index (SRI) – a value that incorporates both solar reflectance and emittance in a single value to represent a material's temperature in the sun. SRI quantifies how hot a surface would get relative to standard black and standard white surfaces. It is defined so that a standard black (reflectance 0.05, emittance 0.90) is 0 and a standard white (reflectance 0.80, emittance 0.90) is 100.

Materials with the highest SRI values are the coolest choices for roofing. Due to the way SRI is defined, particularly hot materials can even take slightly negative values, and particularly cool materials can even exceed 100.

Cool Roofing Programs Solar Reflectance Emittance Solar

Reflectance Index Energy Star® Low slope1 Initial Aged2

0.65 0.50

Steep slope Initial Aged2

0.25 0.15

Calif. Title 243 Low slope Initial Aged2

0.70 0.63

0.75

75

Green Globes Low slope 784 Steep slope 29 USGBC LEED® Low slope 784 Steep slope 29 ASHRAE 0.70 0.75

1 Roof pitch 2/12 or less. 2 Three year field exposure. If CRRC testing for 3-year field aged reflectance is not available, it can be derived using the California Title 24 calculation method for aged solar reflectance.

3 Requirement for conditioned spaces only. 4 Roughly equivalent to, for example, 0.65 reflectance and 0.90 thermal emittance, although a

number of different combinations of reflectance and emittance can achieve this value.

SIKA CORPORATION • ROOFING

Characteristics of Common Roofing Systems1

Solar Reflectance

Emittance Solar Reflectance Index

Black EPDM 0.06 0.86 -1 Smooth Bitumen 0.06 0.86 -1 White Granular Surface Bitumen

0.26 0.92 28

Dark Gravel on BUR 0.12 0.9 9 Light Gravel on BUR 0.34 0.9 37 White Thermoplastic 0.83 0.90 104

1 Lawrence Berkeley National Laboratory Cool Roofing Materials Database

Sika Sarnafil’s EnergySmart Cool Colors

Initial Solar Reflectance

Aged Solar Reflectance

Initial Thermal

Emittance

Aged Thermal

Emittance1

Solar Reflectance

Index

Aged Solar Reflectance

Index

Listings Approved Slope

Sarnafil EnergySmart White 0.83 0.70 0.90 0.86 104 85 CRRC &

Energy Star Low & Steep

Sarnafil EnergySmart Tan 0.73 0.65 0.85 0.86 89 78 CRRC &

Energy Star Low & Steep

Sarnafil EnergySmart Light Gray 0.50 0.44 0.84 0.85 56 49 CRRC &

Energy Star Steep

Sarnafil EnergySmart Patina Green 0.55 0.46 0.86 0.85 64 51 CRRC &

Energy Star Steep

Sikaplan Fastened 45 EnergySmart White 0.83 0.642 0.89 Pending 104 Pending CRRC &

Energy Star Low & Steep

Sikaplan Fastened 60 EnergySmart White 0.85 0.662 0.89 Pending 107 Pending CRRC &

Energy Star Low & Steep

Sikaplan Adhered EnergySmart White 0.85 0.662 0.89 Pending 107 Pending CRRC &

Energy Star Low & Steep

1 Applicable only to CRRC 2 Derived using the California Title 24 calculation method for aged solar reflectance

DOE Cool Roof Calculator http://www.ornl.gov/sci/roofs+walls/facts/CoolCalcEnergy.htm

ENERGY STAR Roofing Comparison Calculator http://rsc.ornl.gov/ Cool Roof Benefits

Potential to reduce A/C tonnage Lower cooling costs Improved occupant comfort Longer roof life Urban heat island mitigation Less smog Lower peak demand on the electricity grid

SIKA CORPORATION • ROOFING

Cost Savings

Americans spend about $40 billion annually to air condition buildings – one-sixth of all electricity generated in this country. White, reflective roofing can help reduce the amount of air conditioning needed in buildings, and can reduce peak cooling demand by 10 - 15% and can provide 10% - 20% air conditioning cooling savings for the building owner. This could possibly save 30 -40 mega watts per year in California.

Case Study

“Measured Energy Savings and Demand Reduction from a Reflective Roof Membrane on a Large Retail Store in Austin”, Ernest Orlando Lawrence Berkeley National Laboratory, June 2001, LBNL-47149.

The study measured and documented summertime air-conditioning daily energy savings and demand reduction from a reflective roof membrane retrofit on a large retail store (100,000 sq. ft.) in Austin, Texas. The original black rubber (EPDM) membrane was replaced with a white thermoplastic membrane with the following results:

- decrease in average maximum roof surface temperature from 168oF to 126oF

- estimated total annual energy savings of $7,200

- estimated present value of future abated expenditures of $61,000 to $71,000 over a conservative roof life estimate of 13 years

Federal and State Rebate & Incentive Programs

Established in 1995, the Database of State Incentives for Renewable Energy (DSIRE) is an ongoing project of the Interstate Renewable Energy Council (IREC), funded by the U.S. Department of Energy and managed by the North Carolina Solar Center. The website provides a comprehensive listing of federal, state and local energy efficiency and renewable energy rebate and incentive programs. http://www.dsireusa.org/