Cool pavements—reflective coatings or additives applied to concrete and asphalt—could have an unfortunate byproduct.
New research conducted in Los Angeles’ San Fernando Valley examined the impact of pavements that had been mixed with a reflective additive. The finding: reflected energy from sunlight can make people walking on the pavement significantly hotter.
According to a researcher’s sensors, on a hot, dry day, a pedestrian could feel more than 7 degrees warmer on a “cool pavement,” compared to how he or she would feel on a standard blacktop. The standard dark pavement stores some of the energy and converts it into heat, while the cool pavement reflects more energy.
Studies support the notion that reflective surfaces can reduce the heat island effect by a few degrees in urban areas, but at least in the brightest times of the day, they can make people walking on them feel hotter. Since 2015, Los Angeles has covered about 50 city blocks in reflective coatings and seals, and plans to continue with this initiative.
Related Stories
| Jan 16, 2013
New standard for geothermal heat pump systems piping to be included in 2015 International Mechanical Code
NSF International, an independent global organization that writes standards, and tests and certifies products, has published the first in a series of American National Standards for Ground-Source Geothermal Piping Systems – NSF/ANSI 358-1.
| Jan 16, 2013
ANSI passes new safety standards for reinforcing steel and post-tensioning
The ANSI A10 Accredited Standards Committee for Construction and Demolition Operations recently approved amendments to the ANSI A10.9 Concrete and Masonry Standard.
| Jan 8, 2013
Congress passes Drywall Safety Act
Congress recently passed the Drywall Safety Act; President Barack Obama is expected to sign it soon.
| Jan 8, 2013
Building-integrated PVs could help boost green standards over the next few years
A developing technology could begin to have an impact on sustainable standards over the next few years.
| Jan 8, 2013
Revamp of codes among nine low tech steps to raise community resiliency
Updating of local zoning and building codes is one of nine low-tech steps that can boost sustainability and storm resiliency, according to this article.
| Jan 8, 2013
Group releases safety and building codes from 24 countries
Public.Resource.Org released 10,062 public safety documents including building codes covering 24 countries and 6 regions.
| Jan 8, 2013
Montana developing high-performance building standards for state projects
The Montana Department of Administration is developing a single building standard for all state facilities, and hopes to have a plan in place this spring.
| Jan 4, 2013
AGC economist says "fiscal cliff" deal will give construction a boost
The deal in Congress to avoid going over the so-called fiscal cliff "should encourage many businesses to go ahead with projects they have held in reserve," said Ken Simonson, chief economist of the Associated General Contractors of America.
| Jan 4, 2013
California standards on furnishings, insulation to be revised
California is revising the state’s standards on interior furniture and insulation to maintain or improve fire safety while reducing or eliminating the use of toxic chemicals.
| Jan 4, 2013
Tilt-Up Concrete Association releases new temporary wind bracing guidelines
The Tilt-Up Concrete Association has released revised guidelines on Temporary Wind Bracing of Tilt-Up Concrete Panels During Construction.