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Study Proves White Thermoplastic Roof Saves Money
In a two-year scientific study, commissioned by the U.S. Department
of Energy (DOE) and the Environmental Protection Agency (EPA), researchers at the Lawrence Berkeley
National Laboratory set out to monitor and verify summertime air conditioning savings and peak electrical
demand reduction at a 100,000 square foot retail establishment in Austin, Texas. Building temperatures
and energy usage was monitored for a period of 1 year with the existing black rubber EPDM roof. The
roof was then replaced with a white, reflective Sarnafil roof membrane and the test was run again during
the same time of year as the previous test. Below are the results:
- Total annual air-conditioning savings
were estimated to be $7,200 or 7.2 cents per square foot. This does not include savings from taxes or
other utility charges.
- The estimated saving over the lifetime
of the membrane was calculated to be between $62,000 and $71,000 (present value). This was based on
an industry average of 13 years for a single-ply roof membrane. Sika Sarnafil roof systems have been
proven to last much longer than this, further increasing the store’s savings.
- Additional
savings of thousands of dollars could be achieved if the building owner participates in the state’s
load curtailment and/or reflective roof rebate programs.
Analyzing the Data
Scientists
from LBNL’s Heat Island group used advanced collection techniques for recording site-specific weather,
temperature and energy consumption data. The monitored input was gathered over a two-year period
in a pre- and post roof retrofit analysis (1999 – 2000).
Click on this
link to download the report titled, "Measured Energy
Savings and Demand Reduction From a Reflective Roof Membrane on a Large Retail Store in Austin"
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Dan Road | Canton, MA 02021 | 800-451-2504 |
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