Six Truths About Cool Roofs

GAF Timberline HDZ® Reflector Series Shingles come in rich, vibrant colors, giving homeowners attractive color options that can be used to comply with the Cool Roof Requirements of Title 24 and the LA County Green Building Standards Code.*Here's why you may want to add these shingles to your business offerings, especially if you work in California.Timberline HDZ® RS ShinglesA few features make these shingles stand out.Meeting California Code ComplianceIn California, residential roofs must meet solar reflectance requirements because they are mandated by California's Building Energy Efficiency Standards Title 24, Part 6 and Los Angeles County Green Building Code. Both codes set a minimum reflectance rating known as the solar reflective index (SRI), which measures a material's ability to reflect sunlight and heat. The lower the SRI value (from 0 to 100), the hotter a material becomes in sunlight. The higher the value, the cooler the material. Shingles with a higher SRI help reduce temperatures by reflecting sunlight which can help reduce the cooling load.The new Timberline HDZ® RS Shingles provide solar reflectance that complies with both Title 24 and the Los Angeles County Green Building Code.Title 24California's Title 24 covers the entire state, unless local requirements are stricter, providing cool roof requirements for residential and commercial buildings based on their locations within 16 climate zones. For residential buildings (new construction), climate zones 1 through 9 and 16 have no cool roof requirements. Climate zones 4, and 8 through 15 require cool roofs for new and reroof applications when more than 50% of the roof is removed.If shingles don't meet the required SRI, alternative paths to compliance include using a radiant barrier, airspace, or additional attic insulation.Los Angeles County Green Building CodeThe Los Angeles County Green Building Code's Cool Roof Ordinance covers buildings in the county and prescribes SRI values depending on the type of building (low-rise residential, high-rise residential and hotels/motels, and nonresidential) and roof slope. High-slope (more than 2:12), low-rise residential roofs must have an SRI of 20 or more. Exceptions apply to roof repairs or replacements where less than 50% of the roof is removed, additions of less than 500 square feet or less than 50% of the total roof area, and green roofs.Selling Points for California HomeownersWhen working with property owners in California and Los Angeles County, you can highlight the following selling points of Timberline HDZ® Reflector Series Shingles.Potential Savings on Cooling CostsReflective roofing may help decrease a roof's temperature and cooling load, which has the potential to lower cooling costs.****StyleTimberline HDZ® RS Shingles provide the darkest highly-reflective shingle available, Charcoal, thanks to EcoDark® granules. They also feature GAF's High Definition® color blends for dimensional, wood-shake look.Peace of MindHomeowners can enjoy heightened confidence when choosing Timberline HDZ® RS Shingles because they come with a Lifetime Limited Warranty***** against manufacturing defects and a 25-year StainGuard Plus™ Algae Protection limited warranty.**Enhancing Homes' AppealHomeowners can rest assured that the new Timberline HDZ® Reflector Series Shingles offer the durability of GAF shingles while providing deep, rich color options to match their unique aesthetic.Color OptionsTimberline HDZ® RS shingles feature newly formulated EcoDark® Granules that provide deep rich, dark colors including Charcoal, the darkest highly-reflective shingle color in California, as well as other popular shingle colors that offer color blends for a more dimensional look.Time-Release Algae Fighting TechnologyTimberline HDZ® RS shingles feature GAF Time-Release Algae-Fighting Technology which uses specially engineered capsules that are infused with thousands of copper microsites. This allows the copper to release steadily over time for long-lasting algae fighting power. It's technology so strong, it powers the 25-Year StainGuard Plus™ Algae Protection Limited Warranty.**WindProven Limited Wind WarrantyTimberline HDZ® RS shingles have LayerLock® technology and the StrikeZone™, nailing area like traditional Timberline HDZ® shingles, and are eligible for the WindProven™ Limited Wind Warranty with no maximum wind speed limitation when installed with the required combination of accessories.***Curious to learn more? Visit the GAF Timberline HDZ® RS Shingles product page for more details.*Can be used to comply with the Cool Roof Requirements for steep slope residential buildings of 2022 Title 24, Part 6, of the California Code of Regulations and the Green Building Standards Code of Los Angeles County.**25-year StainGuard Plus Algae Protection Limited Warranty against blue-green algae discoloration is available only on products sold in packages bearing the StainGuard Plus logo. See GAF Shingle and Accessory Limited Warranty for complete coverage and restrictions.***15-year WindProven™ limited wind warranty covers GAF Shingles with LayerLock® Technology only and requires the use of GAF Starter Strips, Roof Deck Protection, Ridge Cap Shingles, and Leak Barrier or Attic Ventilation. See GAF Roofing System Limited Warranty for complete coverage and restrictions. Visit gaf.com/LRS for qualifying GAF products. For installations not eligible for the WindProven limited wind warranty, see GAF Shingle & Accessory Limited Warranty for complete coverage and restrictions.****Energy cost savings are not guaranteed and the amount of savings may vary based on a variety of factors, such as climate zone, utility rates, radiative properties of roofing products, insulation levels and HVAC equipment efficiency.*****Definition of Lifetime: The word "Lifetime" means as long as you, the original owner(s) [or the second owner(s) if coverage was properly transferred during the Smart Choice Protection Period], own the property where the shingles and/or accessories are installed. The Lifetime warranty is applicable only to shingles and accessories installed on a single-family detached residence owned by individuals. For any other type of owner or building, such as a corporation, governmental entity, religious entity, condominium or homeowner association, school, apartment building, office building, or multi-use structure, the length of the warranty is 40 years. See the GAF Shingle & Accessory Limited Warranty, GAF Roofing System Limited Warranty and GAF Golden Pledge Limited Warranty for complete coverage and restrictions.

Extreme heat has been the greatest weather-related cause of death in the US for the last 30 years. In fact, between 2010 and 2020, roughly 12,000 Americans died from extreme heat, with Native American and Black communities disproportionately affected. Around the globe, excess heat collects in urban areas and can contribute to increased heat-related death and illness, diminished quality of life, and reduced economic opportunities.One example of this urban heat is Los Angeles's Pacoima neighborhood. During days of extreme temperatures, Pacoima had seven times the number of excess heat emergency room visits (19,000 between 2009 and 2018) compared with nearby Santa Monica, an affluent community of similar size, according to Bloomberg.Economic sectors, such as tourism and local businesses, also feel the effects of urban heat. Pacoima food truck vendor Jennifer Ramirez told Bloomberg she couldn't start work until outdoor and street temperatures cooled. Otherwise, her food truck generator could blow out.Fortunately, cooling strategies are now available and being used in initiatives like the GAF Cool Community Project to help mitigate urban heat.Understanding Heat IslandsYou can envision heat islands as heat-saturated sponges spread out across vast, shimmering urban spaces. These "islands" tend to have minimal shady vegetation, so their blacktop and hard surfaces—such as pavements, parking lots, concrete recreation areas, and roofs—absorb and retain the sun's heat well into the evening. Temperatures in urban heat islands can often be 15°F to 20°F hotter than in equivalent vegetated areas.In technical terms, darker, tarmac-covered surfaces have a "low albedo" effect, which describes the ability to reflect and diffuse the sun's rays back to the upper atmosphere. Meanwhile, reflective, snow-covered regions such as the Arctic have "high albedo." Areas with low albedo are at greater risk of experiencing increased heat retention.Densely packed buildings compound a low albedo effect by preventing cooling breezes from lowering temperatures. To top it off, heat islands can trap waste heat from cars, air conditioners, and other heat-emitting devices—exacerbating the effects. In terms of detrimental environmental impacts, this is the perfect, overheated, storm.Shifting from Heat Islands to Cool CommunitiesThe GAF Cool Community Project addresses the complex issue of urban heat with a simple solution: Take a hot, sun-exposed community with an abundance of heat-retaining surfaces. Then, apply colorful, solar-reflective coating to its streets and public hardscaping—such as GAF StreetBond® pavement coatings with Invisible Shade™, which Time magazine named one of the Best Inventions of 2022.The result? Cooler surfaces and ambient air temperatures.Making Progress on Cooling PacoimaLA's Pacoima neighborhood is one example of a community hit hard by heat. A true urban heat island, it has consistently been one of the city's hottest areas. On one summer afternoon in 2022, Bloomberg reported a pavement temperature of 127°F at noon. Just one hour later, it had risen to 141.8°F.Many of Pacoima's residents are in lower-income brackets and live in spaces that haven't been fully optimized to mitigate heat island effects. So, combatting the heat became a priority for local officials and organizations. Melanie Torres, community organizer with Pacoima Beautiful, said that "the cooling solutions that were brought here to Pacoima were actually very impactful to our community." Torres shared, "it definitely cooled things down, but we definitely did need the educational aspect —beginning the discussion of climate exchange and what extreme heat is, and how we can create solutions to combat it."With resources and support from GAF and non-profit partners, more than 700,000 square feet worth of streets, parking lots, and other hardscapes were coated with StreetBond® over a contiguous 10-block area. Attractive, colorful solar-reflective materials cover the park and playground areas, and blue and white coatings brighten the public basketball court. The formerly dark streets are now a cool gray-blue.According to Miguel Angel Luna, president of Urban Semillas, Pacoima residents are right "on the front line of climate change." Urban Semillas is an LA-based social and environmental justice consultancy working with GAF on the Cool Community Project.Achieving Positive Results in PacoimaOver the past year, Cool Community Project members monitored pavement and air temperatures using sensors, satellite technology, and drones. Findings from the past 12 months of observation have shown a positive impact on the Pacoima community:Ambient air temperature (Surface temperatures have been reduced by an average of 10°F during the daytime on sunny days.The second phase of the project includes applying pavement coatings to an additional 500,000 square feet of streets and introducing a new cooling technology on select residences—Timberline® CS Shingles. These shingles are made with a highly reflective material that can help reduce attic temperatures and air conditioning costs.In addition to heat reduction and urban beautification, GAF StreetBond® can help preserve pavement. Longer-lasting pavement can save cities time, money, and resources while giving them another tool to help mitigate the impacts of climate change. This is just another way GAF is looking to strengthen communities from the ground up.Through this project, GAF and its partners aim to improve the lives of the roughly 2,000 people living within the project area of Pacoima. They're accomplishing this by taking what Jeff Terry, GAF vice president of sustainability, describes as a "complete community approach," which involves residents and local organizations coming together to create a model for cities around the world.Reducing Temperatures at HomeWhether urban or rural, all communities can use technology to help reduce indoor and outdoor temperatures. Some cooling strategies that can be effective across cities or in your own home include:Cool SurfacesSurfaces treated with solar-reflective coatings can help reduce heat absorption and lower street and ambient air temperatures. Plus, products such as StreetBond® come in a range of colors to highlight urban areas and preserve pavement.Cool RoofsSolar reflective shingles like Timberline® CS Shingles may save homeowners an average of 7% to 15% on their total cooling costs.* This cooling technology can minimize a building's solar heat gain by reflecting incoming sun rays and reemitting the absorbed energy.Ready to get started in your neighborhood? Check out the inspiring community improvement projects at streetbond.com. (A division of GAF, StreetBond® offers the same quality and reliability customers have come to rely on from North America's largest roofing and waterproofing manufacturer.)*Potential for savings depends on various factors including, but not limited to, climate zone, utility rates, location, and HVAC equipment efficiency.

Exactly how hot does a roof get in the summer? According to the US Department of Energy, traditional darker asphalt shingle roofs can get up to 150°F on a sunny summer day. And prolonged exposure to high heat like this can damage your roof.Four Potential Effects of Summer Weather on Your RoofHere are four common ways hot summer weather can adversely affect your roof system:1. High HeatOver time, high heat can damage roofing materials.2. Ultraviolet LightUV light shines down on your roof on both sunny and cloudy days during the summer. Over time it can cause materials to deteriorate and diminish the amount of protection your roof shingles ultimately provide, leaving your roof vulnerable to leaks.3. HumiditySummer's high humidity can also damage your roof by creating condensation that collects under the shingles. If left unaddressed, this moisture can cause water damage, leaks, or mold growth.4. Thermal ShockThermal shock occurs when high temperatures during the day are followed by quickly cooling temperatures at night. This temperature swing can cause roofs to expand and contract rapidly, weakening the roof's integrity.How to Reduce the Risk of Heat Damage to Your RoofHere are a few strategies to help reduce the risk of heat damage:Ventilate the AtticA properly balanced attic ventilation system helps damaging heat and moisture to escape. Make sure you have the proper amount of ventilation needed to keep attic temperatures down.Maintain and Clean ShinglesRegularly removing debris and replacing damaged shingles can help ensure your roofing system is operating correctly. If you don't take care of your roof, its integrity could be compromised. It's best to leave this work to the professionals, so consider scheduling regular maintenance.Have the Roof InspectedHave your roof inspected at least twice a year for damage. Have a professional perform these inspections, as they know what to look for and can do so safely. Damage can often be seen inside your home before it shows up on your roof, so be sure the inspection looks both inside and outside for potential issues.Choose a Cool RoofInstalling a highly reflective roof (often known as a "cool roof") can help prevent early damage from the sun and may even help reduce cooling costs.1 How hot does a roof get in the summer when it's designed with "cooler" materials? A highly reflective roof can keep the surface 50°F cooler compared to traditional roofs, notes the US Department of Energy.2Benefits of Cool RoofsTwo factors affect the coolness of a roof: thermal emittance and solar reflectance. Thermal emittance is a roof's ability to shed heat by giving off thermal infrared radiation. Solar reflectance is its ability to reflect or bounce sunlight off the roof before heat is created.In general, light-colored roofs stay cooler than darker ones. However, new advances have made it possible to get cool roofs in a variety of architecturally pleasing colors. The benefits of a cool roof may include:Lowering cooling costs1Reducing the load on air conditionersEligibility for rebates and other incentives from utilities or government programs4Decreasing roof temperature, which may help extend the life of the roofCurious to learn more? Contact a local roofing professional today to find out how you can reduce the temperature of your roof, either through increased ventilation or by installing a cool roof system.1 Energy cost savings are not guaranteed and the amount of savings may vary based on climate zone, utility rates, radiative properties of roofing products, insulation levels, HVAC equipment efficiency, and other factors.2,3: From energy.gov/energysaver/cool-roofs.4 Rebates and Incentives, and their eligibility requirements vary and availability is not guaranteed.