Commercial Roofing Systems and Solutions

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.

As a roofing contractor, you know how noisy roofing projects can get. And when repairing or replacing roofs on institutional properties, like schools and healthcare centers, it's often not possible to remove occupants during the project's duration.Accordingly, minimizing disruption at these facilities is key, as students need to be able to concentrate and patients must be protected as they recover. Here are common disruptions to consider and how to reduce them, with insight from GAF Building and Roofing Science Research Lead, Elizabeth Grant.Common Disruptions on Construction SitesYou have several challenges to consider when working on schools or other facilities with ongoing operations, including noise, odors, and occupants' safety.Elevated VolumeHeightened noise levels can affect both students and patients. At schools, loud sounds can affect students' ability to learn and concentrate. Likewise, construction noise can impact patients' ability to rest and recuperate in healthcare facilities.Strong OdorsWhen using certain roofing materials on big job sites—like powerful adhesives or hot-mopped roofing systems—odors may infiltrate the building. This may be distracting and affect the comfort of students and patients.Heavy MachineryUnloading and staging material can also cause disruption, as materials must be staged onsite to be ready for installation as the job progresses. This often involves using heavy equipment, such as cranes and lifts. Proper safety protections must be in place to ensure worker and occupant safety.Roofing Products That Minimize DisruptionUnfortunately, there's no good time for a roof repair or replacement at a medical facility. You may be able to complete school projects when school is out of session, but that isn't always the case if a leak or storm damage occurs.The best (and most proactive) way to minimize disruption is to use durable, long-lasting materials, as this reduces the number of times crews need to work on the roof.Single-Ply MembranesGrant recommends a robust single-ply membrane or a system with some redundancy, such as a multi-ply modified bitumen. She also suggests leveraging a hybrid system, composed of a multi-ply modified bitumen system with a single-ply top sheet for reflectivity.Cover and Substrate BoardsFor resiliency against noise-causing conditions such as hail and foot traffic, Grant suggests using cover and substrate boards. Cover boards are installed on top of the insulation and provide sound insulation, while substrate boards are installed directly on the roof deck under the insulation."If you have a really noisy location, and you want to keep people inside from hearing a lot of disruption, having cover and substrate boards included in the system can be really important," says Grant.Adhesives and FastenersAnother change you can make to reduce disruption is using adhesive to attach roofing products instead of mechanically fastening them. This helps avoid the noise from driving fasteners into the roof deck—and enables a faster installation.Grant notes that, depending on the FM and wind ratings required, it may be possible to adhere all the system components, including the insulation, cover boards, and membrane. An adhesive like GAF EverGuard® TPO Quick-Spray Adhesive can effectively adhere TPO and PVC roofing materials. The product has a high initial tackiness, allowing for faster installation than traditional adhesives. You can also opt for self-adhering products (vapor retarder, pipe boots, TPO roofing, etc.), which can further reduce installation time by eliminating adhesive application from the process.Materials That Shorten Project TimelinesA creative and efficient way to minimize disruption at school and hospital job sites is to reduce the time crews are on the roof. By taking advantage of time-saving materials, you can reduce the risk to workers and occupants, increase productivity, and ultimately take on more work.In addition to the Quick-Spray Adhesive, GAF offers several materials designed to cut installation time and labor:Wider rolls of TPO (12 feet instead of 10 feet) can help crews to spend less time installing systems on wide-open roofs.Insulation installation is easier with lightweight Ultra HD Composite Insulation, and it eliminates the need for one full application of adhesive in adhered systems.TPO self-adhered membrane can cut installation time by as much as 60% compared to installation using traditional bucket and roller adhesives.Experienced Support That Streamlines WorkIn addition to product and material selection, you can minimize disruptions by having GAF professionals from the Tapered Design Group help design the tapered insulation system. These professionals can help you with a variety of services, such as:Tapered insulation designTapered insulation Inventory management and orderingBudget friendly alternativesTapered insulation systems are designed to improve the drainage slope on roofs with substrate damage or without enough slope. The tapered design team at GAF "balances suitable slope with the least amount of material," Grant says. "To help with saving money, saving material, and saving time."This group designs tapered insulation systems that can be loaded and labeled strategically to minimize material handling and time spent looking for and transporting materials. Products are bundled by roof area, and a color-coded plan distinguishes areas for each bundle. Materials are precut and specifically designed for each project.Additional Tools to Save Time and LaborTwo other GAF tools can help you reduce the time spent on projects: GAF QuickSite™ and GAF QuickMeasure™.GAF QuickSite™GAF QuickSite™ provides the information you need before approaching a potential customer. It gives you a snapshot of local codes (important if you're working in an unfamiliar location), a 10-year wind and hail history, historical photographs documenting changes over time, and parcel information (including size and sales dates).GAF QuickMeasure™GAF QuickMeasure™ provides complete roof measurements including parapet wall lengths, heights and widths to help create estimates, past views showing how a roof may have changed over time, grid-lined paper for buildings with predominate pitch of 0 or 1, and a DXF file output for CAD.With the help of GAF QuickSite™, GAF QuickMeasure™, and the Tapered Design Group, you can confidently give your healthcare clients and school customers accurate estimates for suitable roofing products to meet their needs. These tools can also minimize disruption to building occupants and help building owners select durable, long-lasting products that will protect their investments for years to come.Leveraging GAF Professionals' ExperienceWhen working on schools, hospitals, and other important institutions, you're working to satisfy not only your clients but the individuals visiting these locations. By minimizing disruption, you can help ensure everyone involved experiences minimal disruption while you complete the project.For more insight into time- and labor-saving products and services, explore GAF School Rooftop Resources.

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.