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Commercial Roofing

Two roofers installing a silicone roof coating on a commercial building.
Commercial Roofing

The Advantages of Silicone Roof Coatings

As a commercial roofing contractor, you're responsible for choosing the right materials for each job. But with so many options available, making a decision can be difficult.Increasingly, industry professionals have been turning to silicone roof coatings for their strength and durability. These coatings can help extend the life of a structurally sound roof and potentially save property owners time and money by delaying a full reroof. Plus, their restoration properties work great with most commercial roofing systems, like EPDM, built-up, bitumen, and metal roofs. What Are Silicone Roof Coatings?Silicone coatings are high-performance, waterproof protective roof coatings. Adding this coating to a structurally sound roof can help extend the life of the existing roof. Silicone is inorganic, so it can maintain its properties in inclement weather conditions. It's also flexible and can absorb most normal roof movement to help avoid cracking and losing its protective features.Benefits of Silicone Roof CoatingsIn addition to flexibility and extending the life of the existing roof, silicone coatings offer several other benefits. Laura Soder, senior product manager for liquids and coatings at GAF, explains that GAF silicone coatings are designed to help protect against leaks and provide related advantages.UV Ray ProtectionThe major benefit of silicone coatings is ultraviolet (UV) ray protection. "GAF silicone is formulated with titanium dioxide, providing exceptional UV stability and high solar reflectance," she says. This UV protection can help lower roof top temperatures, which may translate into more efficient operation of roof top units.Cost-EffectiveSilicone coatings are cost-effective solutions that can help delay the cost of materials and labor needed to replace the entire roof. They work great with most commercial roofs and pair exceptionally well with metal roofs.Restores and Helps Extend the Life of the Existing RoofSoder notes that silicone coatings adhere well to metal roofs, making them an excellent way to extend the service life of metal roofs. Before application, brush away light rust or spot-treat heavier rust. "There are a lot of metal roofs out there, and for those that are structurally sound and require only moderate restoration, you can easily add years to the roof's life by coating them with silicone," she says.Moisture-ResistantSilicone coatings are also known for their moisture-resistant capabilities. Since silicone is inorganic, it resists degradation in areas that pond water, making it an ideal choice in areas that experience rain or snow.Works in Hot and Cold WeatherSilicone has a wide temperature application range. Because it doesn't contain water, you can apply it at lower temperatures than acrylic and other roof coatings. It provides a monolithic, seamless waterproofing layer over existing metal roofs. Silicone will also flex with metal in cold and hot weather.How Silicone Compares to Elastomeric CoatingsCompared to acrylic and other elastomeric roof coatings, silicone has some advantages.Acrylics are water-based protective coatings with UV resistance —but they shouldn't be installed where there is ponding water, as they can break down and start delaminating. Silicone is a moisture-cure material, meaning it reacts with moisture in the air and cures to a finished film.Soder explains that both materials are flexible and appropriate for use over metal. But if you have any standing water, acrylic isn't the best choice. "While silicone is more expensive, it typically weathers at a much slower rate than other coatings," she says. That said, one of silicone's drawbacks compared to other elastomeric roof coatings is that it's slippery when wet.Navigating Installation and ApplicationWhile silicone coatings can help extend the life of an existing roof, Soder notes it's best to install the coating before the end of the existing membrane's service life.Since leaks tend to happen at roof seams, add silicone sealant to these areas. Sealants are formulated differently than coatings—they use different silicone polymers, giving them a heavier body and stronger build. Silicone sealants are formulated for high-stress areas and can help absorb movement at critical points in the roof. They work hand in hand with a silicone coating to protect the roof.Before you apply any coating, ensure the roof is clean, dry, and sound. "Clean means free of contaminants, dust, oils, leaves, and other debris," Soder says. You can use GAF Cleaning Concentrate to power wash your roof.Since silicone is moisture-cure, the roof needs to be dry before applying. Coating over a wet surface can affect adhesion and is often one of the biggest mistakes you can make when installing. You want the coating to start the curing process from moisture in the air, not from moisture on the roof.How to Apply Silicone CoatingsApplying a silicone roof coating involves five steps:Clean any debris off the roof and test that the coating will properly adhere to the surface.Ensure the roof is in sound condition. Repair broken sheet metal, and replace missing or damaged fasteners.Treat all seams and fasteners with silicone sealant like GAF Silicone Mastic. Apply it at 60 mils or 1/16-inch wet thickness with a brush.Use the same sealant on any curbs, penetrations, and drains.Finally, apply the silicone roof coating to the entire roof. Some coatings, like GAF Unisil Silicone, require two coats, while others such as the GAF High Solids Silicone may need just one.Understanding Maintenance Needs and LongevityMaintaining a silicone roof coating is essential. Addressing issues before they become problematic can help minimize the cost of repairs and maximize the service life of the coating.As the roof flexes over time, issues with the seams might develop. A good rule of thumb is to get a roof inspected every six months. Applying a silicone sealant can help address areas with leaks or cracks. Silicone sealant is UV stable and doesn't require a top coat, according to Soder.Adding Silicone Roof Coatings to Your ToolboxWith many benefits, silicone roof coatings should be front of mind when planning roof restoration projects. And with several options available, you can choose the best type for each roof you work on. Have more questions about roof coatings? GAF technical service reps are more than happy to assist you on your next coating project.

By Mark Soto

October 15, 2024

Featured Blogs

  • A commercial roof drain.
    Commercial Roofing

    The Importance of Commercial Drain Maintenance

    A low-slope commercial roofing system is responsible for keeping the elements out of the building. During heavy rain, water with nowhere else to go may pond on the roof. A roof drain prevents water from ponding by providing a way for it to leave the roof, and regular commercial drain maintenance ensures its continued performance.Although commercial buildings may appear to have flat roofs, some roofs have slopes built into the structure or require added slopes, typically achieved with tapered insulation to facilitate water drainage. This slope is designed to guide water to a drain, so it doesn't sit on the roof and damage the roofing system or structure. Standing water can slowly deteriorate certain roofing materials and cause premature degradation, failure, or damage. It can also promote algae and plant growth and attract nuisances such as birds and insects.Guiding Water off the RoofResidential roofs have gravity on their side—water flows down the slopes into gutters that transport it away from the home. Commercial buildings with low-slope roofs have to work a little harder to remove water, which is where roof drains come into play.The roofing system design can help guide water toward the drains. It often involves using tapered insulation such as GAF EnergyGuard™ tapered polyiso insulation. The two most popular tapered boards deliver a 1/8-inch or 1/4-inch per foot slope. This slight slope prevents water from standing on the roof, forcing it toward a drain strategically installed at various low points on the roof with crickets and saddles.Drain placement is particularly essential when the parapet wall sheds water. To help water arrive at the drain line or gutter, tapered crickets are typically installed in corners and between drains to direct the flow and alleviate ponding. This water must flow down the roof side of the parapet wall and follow the roof slope to reach the drain.3 Common Types of Roof DrainsInner DrainsInner drains are connected to sloped pipes under the roof that carry water off the roof and away from the building. They typically rely on gravity and the roof's slope to get water to the drain.ScuppersScuppers are found at the roof's edge, usually installed through a hole in the parapet wall. They're designed to drain water from the roof into a downspout or may extend out from the building to shed water.Siphonic DrainsSiphonic drains feature a baffle that keeps air out and allows water to fill the pipes. Once the pipes are full, the lack of air creates a vacuum that siphons water from the roof at a high velocity. The baffle also keeps leaves and debris from gathering in the drain and causing a blockage.Caring for and Maintaining Roof DrainsInspecting and maintaining roof drains should be part of your regular roof inspections. Because roof drains are located at low points on the roof, it's easy for debris or leaves to build up in these areas. Clearing debris is essential for the drains to function properly. Clogs encourage pools of water to form on the rooftop, which can cause structural issues for the building. Even just an inch of standing water can add thousands of pounds of weight to the roof, reinforcing the need for regular commercial drain maintenance.Advancing Roof Drain Maintenance with TechnologyGAF recently introduced the Steely Drain™. This is a roof drain solution that leverages technology allowing contractors to build their maintenace relationship by setting up building maintenance reminders to contact building owners or facility managers. This contractor-inspired drain is made of 316L marine-grade stainless steel, making it ideal for tough environments that require exceptional corrosion resistance.Steely Drain™ features a QR code etched onto the top that you can scan with your smartphone to instantly view information about the roofing system. This data can include the contact information of the contractor who installed the system, the architect and consultants for the project, and the roofing system details if all information is inputted.This critical data is managed from a convenient GAF-hosted dashboard and plays an important role in the roof's maintenance plan. Contractors can set up and receive email reminders when it's time to perform scheduled roof and drain inspections. The dashboard also eliminates the need for core cuts since every detail of the roofing system is available through the QR code—from the deck type to the cover board, underlayment, insulation type and thickness, to the final membrane.Knowledge Is Key to SuccessWhen properly installed and maintained, roof drains can keep the rooftop free of standing water for many years. Curious to learn more? Explore how the Steely Drain™ can help you with your ongoing maintenance programs. You can also visit the GAF CARE Contractor Training Center to gain additional tips and access valuable training courses that allow you to learn at your own pace.

    By Karen L Edwards

    August 29, 2024

  • 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.Commercial 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 Commercial 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

  • Roofing contractors reviewing job plans.
    Commercial Roofing

    Using Self-Adhered Roof Membranes and Other Time-Saving Roofing Tips

    With the labor pool stretched thin, finding time-saving solutions like installing a self-adhered roof is high on many contractors' to-do lists. Saving time doesn't mean jeopardizing quality: manufacturers continually work to deliver solutions that help increase efficiencies while still delivering a first-class installation.Thermoplastic Polyolefin (TPO) is one of the fastest-growing single-ply roofing solutions. For instance, GAF EverGuard® TPO offers excellent protection in an affordable roofing system, making it one of the most popular choices for building owners. To help contractors save time while still delivering a high quality installation, GAF offers several time-saving tools.1. Quick Spray AdhesiveUsing spray adhesive means you can put away the roller—and time-consuming methods of applying bonding adhesive. EverGuard TPO Quick Spray Adhesive is a solvent-based adhesive that allows installers to quickly bond TPO membrane to a variety of substrates. In addition, when used properly, a Quick Spray canister can cover installation of approximately 10 squares, compared to the approximately 3 squares of installation a bucket can cover. (As with all adhesives, porosity of the substrate can impact coverage rates.) Simply spray the adhesive uniformly onto the substrate and the back of the membrane, then apply pressure with a broom or weighted roller to ensure adhesion and heat weld the seams.2. Prefabricated AccessoriesIt can take a significant amount of time, experience and know-how to properly measure, cut and hand weld details. GAF has prefabricated accessories available for most details of a rooftop, offering a full line of vent and pipe boots, tube wraps, pourable sealer pockets, and universal corners that can be cut to accommodate either an inside or outside corner. You can save time and ensure consistent quality in all the flashings by choosing these ready-to-use accessories. These accessories can help contractors boost their productivity.3. Self-Adhered TPOYou can eliminate the need to apply adhesive altogether when you choose a self-adhered roof. GAF's EverGuard® SA TPO comes with the adhesive already applied on the back of the membrane. Once positioned, the crew just folds the membrane sheet back, removes the release liner to expose the factory-applied adhesive, lays the membrane in place and brooms in the sheet before using a weighted roller. Then the crew heat welds the seams.4. Extra-Wide RollsWhen self-adhered TPO isn't an option, roofers can make their installation time more efficient by using rolls of membrane that are wider than the standard 10 feet. GAF offers 12-foot-wide rolls of membrane that are ideal for jobs with large, open rooftop areas. Get more coverage in less time, and 20% wider rolls means fewer seams to weld.5. Learn From the ExpertsGAF offers a robust video library featuring roofing veterans Dave Scott and Wally Brown. The Roofing it Right series features how-to videos, including a Self-Adhered Membrane Product Overview. These informative and educational videos cover topics as diverse as roof inspections, core cuts, tear-offs, and installations.Contractors can both provide quality installations and save time on the job by taking advantage of these innovative solutions. You can also reach out to your GAF Territory Manager for additional information or to discuss your specific project needs.

    By Karen L Edwards

    June 30, 2022