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Commercial Roofing

Roofers install a GAF EverGuard PVC roofing system.
Commercial Roofing

How PVC Experts Can Help Design Specialized Roofing Projects

With the growing popularity and versatility of PVC roofing systems, GAF has responded by building a team of PVC experts to aid architects, specifiers, and the design community in project success. These highly trained and experienced professionals offer 1:1 support to help answer customers' questions and unique needs when working with PVC on roofing projects, and are here to help you!PVC, or polyvinyl chloride, is a single-ply thermoplastic roofing membrane. The material's characteristics help it thrive in particularly challenging applications. In fact, PVC roofing systems have a proven track record in the US, first introduced in the 1970s after making their debut in Germany a decade earlier.Here's a look at the benefits of PVC roofing systems as well as the guidance and support offered by the PVC experts at GAF.PVC Roofing Advantages and ApplicationsWhile several materials are available for use in roofing systems, PVC has been identified as a particularly long-lasting option. Accordingly, it's steadily grown in popularity nationwide.David Allor, senior area PVC specialist, joined the GAF team in 2022 as a PVC expert. His role was created specifically to support roof designers. Allor has an extensive background in the commercial roofing industry and extensive knowledge about PVC as a high-performance roofing solution."The industry refers to it as a very spec-driven product, and I believe what they're speaking to is a specifier's preference to work with a product that's been well established in the market and field tested," Allor shares. "It has the ability to provide protection against chemical exposure* and stand up well to challenging environments."While PVC may be a spec-driven product, it's also application-driven. Allor explains that PVC roofs may help provide protection for restaurants, food manufacturers, and packaging plants—any facility using animal fats where oils may be exhausted.* He also says that even if the building itself isn't exhausting gases, grease, or chemicals, it's important to consider the buildings and structures that surround it, as their exteriors may be subjected to exhaust that could degrade roofing systems.*Supporting the Design CommunityAs North America's largest roofing materials manufacturer, GAF has equipped teams with the resources and specialists needed to supply customers with more than just products. In recent years, the company built a solid team of PVC specialists that cover the entire US. These specialists assist customers with PVC specifications, roof system designs, and whatever else designers need to ensure successful project outcomes.Whether your project or design firm is based in the Northeast, Southeast, Southwest, Midwest, or West Coast, a PVC specialist is positioned to help. Allor explains the team of GAF PVC specialists is active in the organizations specifiers belong to, including the American Institute of Architects, the Construction Specifications Institute, and the International Institute of Building Enclosure Consultants.Allor describes the team's role as supporting the customer and connecting them to other GAF project support teams that can help. For instance, he said he called on a leading architectural design firm in the Boston area—and two months later, someone reached out for assistance with a specific project needing a tight turnaround."Literally within 12 hours of them reaching out to us, we replied and committed to three pertinent deliverables, those being a Tapered ISO Design Package, an Assembly Letter confirming all FM Requirements, and last but not least, a conference call the next day with the Building and Roofing Science team to go over three critical transitional details." Allor says.Committing to Successful Project OutcomesThe PVC specialists at GAF are focused on one goal: helping architects, specifiers, and the roofing design community achieve successful project outcomes through a high-performing PVC roofing system. With professionals like Allor providing insight and guidance, you can rest assured your PVC project will be in good hands.Ready to get started on your next PVC roofing project? Explore the different PVC roofing solutions available, and visit this page to find your local PVC roofing specialist who is ready to assist you.*GAF warranties and guarantees do not provide coverage against exposure to chemicals, grease, oils, animal fats or exhaust. Refer to gaf.com for more information on warranty and guarantee coverage and restrictions.

By Karen L Edwards

April 22, 2024

Featured Blogs

  • A roof with a fleeback membrane being installed by contractors.
    Commercial Roofing

    What to Know about Fleece-Back TPO

    As a contractor, you're constantly on the lookout for ways to get the job done quickly while continuing to provide a high level of quality to customers. Carefully selecting the materials you use can help—and with new roofing technologies being developed every day, you have a lot of options.Thermoplastic polyolefin (TPO) single-ply membranes are a cost-effective solution for commercial roofs. And when you add a fleece backing, the resulting fleece-back TPO adds even more durability, protection, and strength to the system. The material can be used for both reroofing projects and new installations.The Benefits of Fleece-Back TPO MembranesHere are a few reasons TPO with a fleece backing might be the perfect solution for your next roofing job:1. Performance and DurabilityFleece-back TPO, like GAF Everguard® TPO Fleece-Back Membrane, provides excellent performance and durability. It's available in a variety of new thicknesses that make it easier than ever to find one that's suitable for your project. For instance, the GAF EverGuard® TPO Fleece‑Back 100, 115, and 135 Membranes offer good impact resistance, as some systems are approved under Factory Mutual (FM) 4470 - Very Severe Hail (Class 1 - VSH).* These membranes are especially suitable for high-traffic roofs, because they provide added protection during regular maintenance of HVAC systems, for example.2. Ease of InstallationInstalling fleece-back TPO membranes can be done easily and efficiently, saving roofers time and labor. They can be mechanically attached for fast installation, or combined with adhesives like the GAF LRF Adhesive XF to reduce overall thermal bridging and add wind resistance capabilities.Commercial building owners and property managers that want jobs finished as quickly as possible will find mechanically attached fleece-back TPO membranes to be an excellent option. Watch the following video to see how they're installed:Because of their versatility, fleece-back TPO membranes are also a popular choice for reroofing projects if your customer isn't looking to completely remove an existing roof:3. UV Ray Protection and Energy SavingsFleece-back TPO membranes come in white and light colors, and they're designed to be ultraviolet (UV) resistant and reflect the sun's rays. By reflecting the sun rays away from the roof, white or light fleeceback TPO membranes can help lower the temperature of the roof and increase the roof's longevity.4. Excellent Warranty or Guarantee CoverageThe robust build of fleece-back TPO membranes means manufacturers can often offer good warranty or guarantee coverage. Depending on the thickness of the membrane and the method of attachment, you could be covered from 20 to 25—or even up to 30—years. This reflects confidence in the quality of the material and provides peace of mind for property owners and managers.Other Considerations for Fleece-Back TPO RoofingWhile fleece-back TPO membrane is typically more expensive than other commercial roofing solutions like smooth TPO, the installed cost may be comparable depending on the installation method used: you can estimate the cost of the EverGuard® Fleece-Back TPO needed for your project using the TPO Material Calculator on the GAF EverGuard® TPO Fleece‑Back Membrane product page. As an added benefit, GAF EverGuard® TPO membranes are made in the U.S.A. with domestic and imported materials.The speedy installation possible with these membranes is convenient for customers and contractors alike, and the durability provides long-term performance. Plus, the fleece-back TPO works well in all areas—even those with harsh weather—so it's not limited to specific locations.If this TPO sounds like the perfect material for your next project, visit the GAF EverGuard® TPO Fleece‑Back product page to learn more.*See FM Global Data Sheet 1-34 for more information. Visit RoofNav.com for approved assemblies.

    By Mark Soto

    June 27, 2023

  • Commercial skylights can help save on energy use
    Commercial Roofing

    How Commercial Skylights Can Boost Revenue

    Historically, commercial skylights have gotten a bad rap. "The old joke was: 'if it's not leaking now, it will be soon,'" says Brian Grohe, a 13-year vet of the skylight industry and a commercial sales manager at industry leader VELUX. Fortunately, technology has changed that old tune for the better, turning commercial skylights into a golden opportunity for roofing contractors.Thanks to revolutionized frame designs, glazing, and water management strategies, installing these rays of light in a roof provides added value to customers while increasing project revenue. Plus, it's now possible to streamline skylight ordering, delivery, and warranty/guarantee services through your roofing manufacturer, which can help save time and money.Benefits of Commercial Skylights"The skylight of the past is not the skylight of the present," Brian explains. "The aesthetic and practical benefits can improve a building's space, increase revenue, and positively impact resale value." Here are just some of the perks of incorporating natural overhead light into your commercial roofing repertoire.Contractor BenefitsExpand work opportunities: Replacement work makes up a large part of the commercial skylight industry, according to Brian. This presents a tremendous service opportunity for contractors if they can identify and repair or replace an older skylight that is sun-damaged, broken, or leaking. "Solve a building owner's problem for them," suggests Brian, "and you'll expand your work while adding value for the customer."Increase revenue potential: Adding this ancillary product into a project proposal provides aesthetic and financial benefits to the customer, and increased revenue potential for the contractor.Benefits for Building OwnersSave money: Explain to customers how a skylight can reduce electrical consumption by harnessing sunlight. In fact, a daylighting strategy can reduce the need for energy-consuming electric lighting by 20% to 80%. This saves on costs for building owners.*Improve tenant or employee well-being: Exposure to natural light can have a positive impact on the health and well-being of a space. This can increase employee productivity, work satisfaction, and overall wellness.Boost building value: Enhancing the architecture and natural light in a space can improve the building's appearance and increase potential resale value.Skylight TypesCommercial skylights come in a range of shapes — dome, pyramid, vault, low-profile, etc. There are also different functionalities, such as vented or fixed, which describe whether the skylight provides ventilation. All of these options fall into two main categories: glass and plastic.A glass skylight is often an architectural consideration, Brian says. "[They] accentuate designs of the building and provide a stunning view."Most commercial skylight projects like those in "industrial buildings, retail, some office spaces, and places like school gyms use the plastic unit skylight," says Brian. Fortunately, "these are already in a roofer's wheelhouse, because it's no different — from a flashing standpoint — than any other roof penetration."Unlike older plastic skylight materials that didn't provide much UV protection, prismatic polycarbonate is now the industry standard. A modern plastic skylight can offer high-clarity, excellent thermal insulation, impact resistance, UV protection, and long-term high light transmission.Choosing the Right SkylightTake these factors into consideration when navigating skylight brand and style selection for a project:Customer and building needs: A project in a storm-prone region may benefit most from a hurricane-rated skylight, while another project focused on maximizing energy efficiency would benefit from sun-harvesting industrial warehouse skylights. For example, VELUX offers the Dynamic Dome, engineered to harvest more early morning and late afternoon daylight than its competitors and allow a building's lights to remain off for nearly an extra hour per day.Proprietary skylight designs: Proprietary skylight offerings from a company typically provide "stronger impact resistance and better UV resistance long-term," says Brian. Often, proprietary designs last longer for the building owner and are safer for roofers.Warranty/Guarantee coverage: Carefully research what a warranty covers when selecting the commercial skylight you'll use for a project. "Some skylight manufacturers have very limited warranties," Brian notes. GAF and VELUX offer a new approach — when purchased through GAF, VELUX skylights are eligible for up to 20-years of coverage under GAF NDL (no dollar limit) guarantees.**Combining Roof and Skylight WarrantiesRoofers can make a project easier and get a stronger warranty by going through one manufacturer and distributor for both their roof and skylight needs. GAF and VELUX have teamed up to provide this seamless service. This alliance "streamlines skylight ordering, freight coordination, warranty/guarantee registration, and any manufacturer claims because it's one manufacturer and one distributor handling the project needs," explains Brian.For roofers, the project makes it easier from a purchasing and ordering standpoint: "All order management and freight coordination happen through one source," says Brian. Consolidating roofing and skylight needs also streamlines the delivery of materials coming to a job site.This also holds advantages during the life of the roof. "You're getting a warranty that's tied into the roof system," says Brian. "This means that if there is a problem with a skylight after construction is completed, the contractor or building owner doesn't have to find out who the manufacturer is and submit a separate claim — they can handle claims through GAF. Also, the timing of the roof guarantees and skylight warranties will match, meaning there are no gaps in coverage."Want to learn more about expanding your roofing services while upgrading your commercial roofing projects? GAF can offer support and expertise for skylight projects and level up your work. Get in touch with your territory manager today.*Savings will vary and are not guaranteed.**See applicable warranty and guarantee documents, available at gaf.com, for complete coverage and restrictions.

    By Annie Crawford

    January 17, 2023

  • Construction workers looking at steel frame building
    Commercial Roofing

    Commercial vs Residential Roofing: What Are the Differences?

    Every roof is different, and that's especially true when comparing commercial vs residential roofing, also known as low-slope vs steep-slope roofing. Many roofing contractors start out installing residential roofs because they have a low cost of entry. The process requires minimal specialized equipment—most roofers are able to start out with a truck, a ladder, a nail gun, a compressor, and safety gear. You can earn a great living installing residential roofs. But as your business grows, you may consider installing larger commercial roofs that provide steady work over weeks or even months. Commercial roofing also brings more opportunities for regular service and maintenance, helping you develop relationships with customers. When it comes time to replace their roof, they'll know your company can get the job done. If you're interested in expanding into commercial roofing, it's important to understand the differences between commercial and residential roofing, from crew size to specialized equipment to financial considerations. Using Specialized Equipment Although you can install shingles with a nail gun, the same can't be said for commercial roofing installations. For instance, if you plan to install a thermoplastic single-ply membrane such as GAF EverGuard® TPO, you'll need to invest in hot air welding equipment to weld the seams and handheld welders for the flashing details. If the system is specified to be an adhered installation, the job may require a spray rig to apply the adhesive efficiently and effectively. In the case of an induction welded system, RhinoBond® induction welding equipment helps secure the membrane and insulation to the roof deck without penetrating the membrane. This equipment can run into the tens of thousands of dollars. Identifying Crew Size and Experience A residential roofing crew can range anywhere from four to six workers, who are typically able to reroof an average-sized home in one day. Commercial roofing crews need more people and more time. Depending on the size of the building and the roofing materials involved, commercial roofing replacements can take anywhere from several days to months. You'll also want to be sure to ensure your crews are properly trained and certified by the manufacturer so that you can offer system warranties or guarantees to building owners for their new roofs. Reviewing Safety Measures Safety comes first on every roofing job, and the safety requirements on commercial roofing projects can vary greatly from those on a residential roof. Prepare a comprehensive safety plan for each commercial roof that includes identifying roof access points, establishing safety perimeter lines at the roof edge, locating and flagging potential hazards such as skylights, and reviewing the need for any special fall protection equipment such as weighted anchors or parapet clamps. OSHA safety requirements are readily available in their guide for protecting roofing workers available on www.osha.org. Considering Financial Concerns While a residential roofing project may have a short life cycle for installation and payment, a large commercial roofing project can take months to install—and potentially months to get paid following the installation. Many large companies pay on a 30-, 60-, or even 90-day payment system, and will often work retainage into the contract. Retainage refers to a percent of every payment that is withheld until substantial completion of the project- which could mean when most other trades on the job have finished their work as well. You'll need to be sure that your company is in a financial position to wait that length of time before receiving payment, and ensure you're capable of completing the job by any date indicated on the contract to avoid liquidated damages. The sales life cycle for a large commercial roofing project can take a long time as well. You'll need a good salesperson who can find jobs, build relationships, and work closely with your estimating team to develop a solid bid. Partnering with Your Manufacturer Navigating the differences in commercial vs residential roofing can raise new questions for roofers. As you expand your business in a new direction, GAF is here to help you find success with a robust training library and expert videos that allow you to learn at your own pace. This support is available through the Center for the Advancement of Roofing Excellence, which has a host of resources and training to fit your goals and the way you prefer to learn. Get started by reaching out to your GAF territory manager, who can help you begin your journey in commercial roofing. RhinoBond® is a registered trademark of OMG, Inc.

    By Karen L Edwards

    June 14, 2022

  • Close-up of hail impacting dark shingles.
    Commercial Roofing

    Protecting Your Building from Hail Roof Damage

    Up to 25% of the United States experiences large hail episodes—and when they do, hail can cause severe damage to roofs and the HVAC equipment stored there. Hailstorms account for 70% of the average annual property losses from severe convective storms in the US. Building owners can protect their buildings and equipment by designing their buildings and roofs to withstand the damage caused by large hailstones. FM Global, an insurance company that specializes in loss prevention and testing, provides a standard for testing and approving assemblies that provide greater hail resistance. Building owners and designers often rely on FM Global's resources to specify desired roofing assemblies and construction methods. These resources include RoofNav assemblies from FM Approvals as well as loss prevention data sheets and Approvals Standards. Well-maintained roofs that meet FM's hail testing and approval requirements are better equipped to protect buildings from hail and water damage that occurs during storms. Assessing Risks from Hail Roof Damage Hail can cause physical damage to a building's roof and the equipment stored there, including dents, cracking, mineral loss on modified bitumen sheets, and compound delamination. Older roofs or those in poor condition may be more susceptible to damage from hail. Roof equipment, including cooling fins and condenser coils, can also be damaged from falling hail. Skylights are subject to hail punctures, which are the main cause of water damage to buildings and their contents. In the US, the most severe hail generally occurs in the Midwest and central contiguous states. According to FM, very severe hail can be found in the region from North Dakota to Texas and Colorado to Missouri. Roofs, roof assemblies, and equipment in this region should be designed to meet FM's specific hail requirements to better withstand hail roof damage. Defining Very Severe Hail FM Approvals has recognized three classes of hail: moderate, severe, and very severe. Moderate hail (MH) is less than 1.75 inches in diameter, which is about the size of a cherry. Severe hail (SH) is 1.75 inches to 2 inches in diameter, similar in size to a golf ball. Very severe hail (VSH) is 2 inches or greater in diameter, similar in size to a billiard ball (or larger). FM's Very Severe Hail (VSH) certification was added in 2016 based on data from the National Oceanic and Atmospheric Administration's National Weather Service and National Center for Environmental Protection's Storm Prediction Center. This data showed a concentration of reports of hail larger than 2 inches in diameter in the very severe hail region. Passing a Very Severe Hail Test FM tests assemblies in accordance with FM 4470: To test an assembly for moderate hail, a 2-inch-diameter steel ball weighing 1.19 pounds is dropped from 81 inches above the assembly. Two samples, unweathered and weathered, are tested 10 times each. This test provides an impact energy of 8 foot-pounds. Testing for severe hail, the same 2-inch-diameter steel ball is dropped from a height of 141.5 inches above the assembly. This test provides an impact energy of 14 foot-pounds. When testing whether a roof assembly can withstand very severe hail, a 2-inch-diameter preformed ice ball is launched at the assembly using compressed air. Three samples are used in this test: one unconditioned, one UV weathered, and the third UV weathered and heat aged for 42 days prior to testing. This test provides an impact energy of between 53 and 58 foot-pounds. After the test is performed, the roof assembly is inspected for dents, cracking, and delamination. Assemblies that pass the test are certified as meeting the FM criteria. You can find an online database of VSH-rated roofing assemblies here; GAF has over 1600 single ply VSH-listed assemblies. The FM standard recommends that building owners inspect their roofs on a regular basis and repair deficiencies; the standard also advises replacing roofs where deficiencies cover a large area or when the roof is nearing the end of its useful life. An owner should also inspect heat and smoke vents and skylights for cracking, yellowing or discoloration, cloudiness, or other indications of damage due to weathering and aging. Skylights showing damage should be replaced as needed, and hail guards on HVAC equipment require inspections to ensure they are in place and free of damage. For more information about GAF and very severe hail, contact your local roofing contractor or complete our very severe hail contact form.

    By Dawn Killough

    May 13, 2022