White roofs can be more effective at reducing the urban heat-island effect than darker roofs and roofs covered with plants, according to a report by the Lawrence Berkeley National Laboratory. White roofs also cost less.
The report, Economic Comparison of White, Green, and Black Flat Roofs In the United States,says that white roofs are three times more effective than green roofs at “cooling the globe.” Researchers analyzed 22 commercial flat roof projects in the U.S. and performed a 50-year life cycle cost analysis.
They assumed a 20-year service life for black roofs and white roofs, and 40 years for green roofs. White roofs save $25 per square meter compared to black roofs and green roofs cost $71 per square meter more compared to black roofs, the report says.
Green roofs provide benefits that white roofs do not offer, however, such as controlling runoff and curbing air pollution.
Related Stories
| Oct 6, 2011
Constructed properly, green roofs hold up well in a hurricane
The heavy rains and high winds of Hurricane Irene didn’t cause any problems for a Con Edison green roof in New York City. The roof contains sedum, a plant that adapts well to drought and handles periods of heavy rain well.
| Oct 6, 2011
RoofPoint: A new green standard for roofs
Structured much like other rating systems, RoofPoint, establishes green standards specifically for roofs.
| Oct 6, 2011
Roofers critical of new OSHA harness rules
Roofers say a new OSHA rule requiring all residential roofers to wear a safety harness makes workers less safe, and is causing lost business for those who comply with the rule.
| Oct 6, 2011
Florida county proposes saving on construction costs by trumping city regulations
This summer, Pinellas County, FL wanted to save money on an $81 million public safety complex in Largo by using the county’s own building regulations and permit fees, not the city’s more expensive fees.
| Sep 30, 2011
OSHA Releases New Nail Gun Safety Document
The Occupational Safety and Health Administration and the National Institute for Occupational Safety and Health have developed a new guidance document, Nail Gun Safety—A Guide for Construction Contractors.
| Sep 30, 2011
Cement Industry Advocates For Environmental Regulatory Relief
EPA regulations impacting the cement industry could force the closure of 18 of the nearly 100 US cement plants and cost 4,000 manufacturing jobs .
| Sep 30, 2011
IRS Releases New Rule On Reclassifying Independent Contractors
The Internal Revenue Service (IRS) has a new Voluntary Classification Settlement Program that allows an employer to reclassify independent contractors as employees if those workers previously were misclassified.
| Sep 29, 2011
Illinois Grapples With Definition of ‘Clean’ Construction Debris
The Illinois Pollution Control Board holds hearings this week about construction debris rules proposed by the state Environmental Protection Agency.
| Sep 15, 2011
Alabama Prepares First Statewide Residential Building Code
Following a series of devastating tornadoes that ripped through Alabama on April 27th, the state is preparing to implement the first statewide building code for residential structures.
| Sep 15, 2011
New Label Established For Energy Efficient Doors in UK
The British Fenestration Ratings Council (BFRC) has established a labelling program for all types of domestic pedestrian doors.
