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Reflective Cap Sheet Covers Commercial Roofs in Southern California

*This article first appeared in Western Roofing Magazine’s June 2017 issue.

With three low-slope commercial warehouse buildings to roof in the Castaic, California, Pomona-based Howard Roofing Company, Inc. worked with Malarkey Roofing Products for the right roofing materials for the job. Situated in sunny Southern California, just outside of downtown Los Angeles, this 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 the new cap sheet,” said Wally Schlieser, Project Manager at Howard Roofing.

524G RCap Plus

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 (asphalt), 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 being coated for reflectivity.

The construction of the 524G RCap™ Plus cap sheet enables it to reflect ultraviolet rays and absorb less heat – ideal for any structure in a warm, dry climate. 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 (SRI) of 87, a value that exceeds LEED v4 requirement for Heat Island Reduction credit.

The Urban Heat Island (UHI) 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. According to the Berkeley Lab, “Urban Heat Islands can increase energy use, degrade air quality, and aggravate heat-related illnesses in cities.” In addition, there is concern about UHIs contributing to global warming.

“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 100 degrees for five days straight,” reported the L.A. Times in February this year.  Also cited in the coverage, was a plan to by the city’s mayor, pledging “to reduce the average temperature in the metropolis by 3 degrees over the next 20 years.”

The Los Angeles metropolitan area is a case study for UHI’s. The project location in Castaic, just northwest of downtown L.A., is in a similar climate and 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.