Cover Story
 
There are many benefits, both economic and environmental, to having a cool roof.  
By strongly reflecting the sun's rays, a building that employs a cool roof system does 
not need to work as hard to maintain a comfortable temperature for itself and its
surroundings.  Cool roof systems not only reduce utility bills, but they also prolong 
the life of air conditioning systems, lower roof maintenance costs, extend the life of 
the roof, and help buildings and homes meet building codes, all while supporting a 
community's quest to lower their energy impact.
	
With three low-slope commercial warehouse buildings to roof in Castaic, California, Howard Roofing Company, Inc., Pomona, California, knew that Malarkey Roofing Products® would be able to provide the right roofing materials for the job.  Situated in sunny Southern California, just outside of downtown Los Angeles, California, this commercial project became a prime candidate for Malarkey’s new 524G RCap™ Plus reflective granulated cap sheet.  “We’ve been bidding a lot of box stores and the specifications usually ask for two plies and a cap, but for this job we picked Malarkey's new cap sheet,” said Wally Schlieser, project manager at Howard Roofing.
	
Malarkey offers an array of SBS polymer modified base, ply, and cap sheets for a variety of applications and climates.  Designed and engineered to perform in extreme weather conditions, the 524G RCap Plus cap sheet is the newest addition to the low slope catalog at Malarkey Roofing Products.  It is manufactured on a non-woven fiberglass mat, coated on both sides with SBS polymer modified bitumen, and manufactured with a fire-retardant mineral stabilizer.  Then, highly reflective white granules are embedded into the membrane of the cap sheet.  The granules are made using Malarkey’s specialized manufacturing technique, allowing the granules to be packed tightly together to ensure maximum reflectivity.  The granulated 524G RCap Plus cap sheet differs from other RCap sheets in the product category, because the granules themselves are reflective, as opposed to being coated for reflectivity.  
	
The construction of the 524G RCap Plus cap sheet enables it to reflect ultraviolet rays and absorb less heat, making it ideal for any structure in a warm, dry climate, such as Southern California.  As part of a roof system, 524G RCap Plus may help decrease building energy costs and extend roof service life.  The cap sheet is listed with the Cool Roof Rating Council, and meets the California Energy Code’s Title 24, Part 6 requirements.  The 524G RCap Plus also has an initial solar reflectance index of 87, a value that exceeds LEED® v4 requirement for Heat Island Reduction credit.  
	
The Los Angeles metropolitan area is considered an urban heat island, meaning that it is significantly warmer than its surrounding rural areas.  Urban heat islands are caused mainly by the activities of humans, particularly the modification of land surfaces and increased energy usage and waste.  Urban heat islands have a multitude of negative effects, specifically impacts on growing seasons, decreased water quality, and increased pollution.  The urban heat island effect of a developed community occurs when the typically dark, impermeable surfaces of urban roofs and pavements warm under exposure to sunlight and heat the surrounding air.  In more verdant, rural areas, air temperature tends to be cooler because of the prevalence of vegetation and sparse development.
	
“Globally, 2016 was the warmest year on record.  Here in Los Angeles, temperature records were shattered last summer during scorching heat waves that saw highs of 100º for five days straight,” reported the Los Angeles Times in February this year.  Also cited in the coverage was a plan by the city’s mayor, pledging "to reduce the average temperature in the metropolis by 3º over the next 20 years.”  One way to achieve this goal, both locally within Los Angeles as well as nationally, is to incorporate cool roof systems onto buildings in hotter climates.
	
The Los Angeles metropolitan area is a case study for urban heat islands.  The project location in nearby Castaic is in a similar climate and has comparable weather conditions.  Malarkey’s 524G RCap Plus was an optimal product to help keep the warehouses and neighborhood cool.  Finished in February, the buildings are now sealed-up, water-tight, and ready to reflect Southern California’s brilliant summer sun.Cover_Story_files/WR%20Calendar%209.12.doc
Cool Roofing
Reflective Cap Sheet Covers 
Commercial Roofs in Southern California
by Bobby Lambrix, communications coordinator, Malarkey Roofing Products