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Commercial Roofing Systems and Solutions

Whether it's TPO, liquid-applied roofing, or anything in between, there's a GAF roofing system for your needs.

We’re developing durable roofing systems for today’s flat roof challenges

Choosing the right roofing system starts with choosing the right roofing company. As North America’s largest roofing manufacturer, our broad product offering means we’re not vested in a single technology.

1Additional requirements apply. Contact GAF for details. See applicable guarantee, available at gaf.com, for complete coverage and restrictions.

2GAF warranties and guarantees do not provide coverage against impact. See applicable guarantee or warranty, available at gaf.com, for complete coverage and restrictions. Hail or puncture resistance coverage may be available for purchase for eligible systems. Contact GAF for more information.

Hydrostop system roofing materials

Discover elastomeric roof coatings for your metal roof restoration project

The HydroStop® System is a cost-effective, long-term solution for restoration of structurally sound metal roofs.
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Our new refocused coatings line-up makes it a snap to spec the one that perfectly suits the challenges of your roof. Whether you need to repair, restore, or extend the life of your existing roof, there’s a GAF coating that can do the job — and now it’s a lot simpler to choose and use.

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The GAF Learning Portal brings personalized learning to our industry partners. You and your team can access the easy-to-use platform on computers, tablets, and mobile phones, whenever and wherever it’s most convenient for you. Low-slope classes include product knowledge, installation skills, business-building techniques and much more.

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In Roofing it Right, Dave and Wally, two of the industry’s most experienced low-slope pros, share their decades of experience to help you and your crew take your roofing game to the next level. Browse some of their videos below.

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Related blogs

Two roofing contractors on a commercial roof at work
Commercial Roofing

Questions to Ask a Roofer for Your Commercial Roof Project

If your commercial building needs a new roof or repair, it might be time to call in a professional roofer. You might have a few contractors in your area, so knowing what questions to ask a roofer can help you find the right one for the job. In addition to requesting examples of their past work, here are eight questions to ask a roofing contractor before hiring them.1. Are You Licensed and Insured?Not all states require licensing but many do, and you'll want to see proof that the contractor is licensed in the state they'll be performing work for you.In many cases, roofing contractors who advertise their services are required to include their license number in the advertisement. Most states that require licensing have online portals where you can verify that the contractor's license is in good standing.Insurance is also important, as sometimes not all jobs go smoothly. The contractor should be covered in case an unfortunate incident occurs.2. Does Your Company Hold Manufacturer Certifications?Roofing manufacturers may offer several certification levels, helping you know what level of service and experience to expect. For instance, GAF Master Select contractors are required to complete ongoing training and be properly licensed and insured. Additionally, they must have at least $1 million in general liability insurance coverage and a satisfactory Better Business Bureau rating, among other requirements.Not every contractor can achieve certification. In fact, only 1% of roofing contractors in the US achieve the GAF Master Select status. This status means the contractor has been vetted by the manufacturer, meets strict requirements for quality control and can potentially offer enhanced warranties on roofing systems.3. Are Your Workers Certified?Many training programs and certifications are available for roofing installers, such as the National Roofing Contractors Association ProCertification® training program and the GAF CARE Contractor Training Center.You want to be sure the people working on your roof understand the proper repair and installation methods for your roofing system. Seeing what certifications they hold can confirm their roofing knowledge and familiarity with the products you're looking to install.4. Is Your Company a Member of Any Industry Associations?Membership in an industry association can demonstrate a roofing contractor's professionalism and commitment to their industry. In addition to regional, state, or national roofing associations, some commercial roofing contractors belong to associations designed for building owners and facility managers, such as the Building Owners and Managers Association or the International Facility Managers Association.If you're a member of either of these organizations, your membership list could be a good place to start your search for a commercial roofer.5. What Is Your Project Timeline and Process?The contractor should consider all aspects of your project when planning it. Ensure they'll install quality roofing systems and solutions, and share any concerns you may have—before work begins. For instance, you may be concerned about how construction may affect building occupants, including noise levels and parking. Your contractor should be able to review a plan with you that addresses these concerns.They should also give you a project timeline from start to completion and be able to explain their process, which can include:Initial site inspectionRepair or replacement recommendationsEstimate developmentProject timelinePlans to minimize disruptionsHow they'll handle and communicate unexpected issuesWarranty options6. How Do I Prepare for the Roofing Project?Determine if you need to take any steps to prepare for the project. For example, your contractor should suggest how to inform building occupants about the upcoming work and how long it will last. Also, if you have neighbors close by or share parking lots, they'll need to be notified too.Every project and building is different, so other preparations may need to happen before the project begins. Your contractor can identify any additional needs as part of their inspection and planning process. In most cases, the contractor will handle precautions—like roping off parking areas or protecting landscaping—and they should communicate that to you before your project begins.7. How Much Will the Project Cost? Are There Contingencies?Most commercial roofing contractors include the project cost in their bid package, but you should also ask about contingencies. A contingency is typically a small percentage of the total project cost that may be included to cover surprises during a roofing project, such as mold or rot. Making unexpected repairs will increase the project's cost. So, understand whether a contingency is included in your estimate so you can financially prepare.8. Do You Have a Maintenance Program for Repair Work?Once your roof has been installed, it's important to take care of it. Ask the contractor if they offer a maintenance program that includes an annual inspection of your roof. This is a great way to assess the health of your roof after a year's worth of weather. Any issues can be addressed before they turn into larger problems.By having a maintenance program in place, you can build a lasting relationship with your commercial roofing contractor and may even be able to extend your roof's warranty. If your contractor participates as a GAF Certified Maintenance Professional® you could be eligible for a 25% warranty extension with the completion of required inspections and proper documentation.Signing with a Commercial Roofing ContractorKnowing what to look for when hiring a roofer is the first step toward a successful project. Now that you know some of the questions to ask a roofer, interviewing them should be more straightforward. Their answers can help you decide if they're the right fit for your project. Keep in mind that it's wise to meet with and interview multiple commercial roofing contractors before signing a contract.Ready to take the next step? Find roofing contractors certified by GAF* in your area and schedule a time to talk about the commercial work you need completed.*Contractors enrolled in GAF certification programs are not employees or agents of GAF, and GAF does not control or otherwise supervise these independent businesses. Contractors may receive benefits, such as loyalty rewards points and discounts on marketing tools from GAF for participating in the program and offering GAF enhanced warranties, which require the use of a minimum amount of GAF products. Your dealings with a Contractor, and any services they provide to you, are subject to the GAF Contractor Terms of Use.

By Authors Karen L Edwards

November 08, 2023

Self-adhered TPO being installed on commercial roof
Commercial Roofing

Time-Saving Products & Tips for Your Commercial Roofing Business

With the labor pool stretched thin, finding time-saving products is high on many contractors' to-do lists. Saving time doesn't mean jeopardizing quality as manufacturers continually work to deliver solutions that help increase efficiency while still delivering a first-class installation.To help contractors save time while still producing high-quality work, GAF offers several products that can help a commercial roofing business do more in less time.1. How Long Does Spray Adhesive Take to Dry?EverGuard® TPO Quick Spray Adhesive has a flash time of five minutes or less and can be applied 50% faster than traditional bucket and roller adhesive. When used properly, a single canister can cover the installation of approximately 10 squares, compared to the approximately three squares of installation a bucket can cover. (As with all adhesives, the substrate's porosity can impact coverage rates.)Because it's a solvent-based adhesive, it's sprayable, allowing installers to quickly bond thermoplastic polyolefin (TPO) membrane to a variety of approved substrates. Simply spray it 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. How Do TPO Accessories Save Time?It can take a significant amount of time, experience, and know-how to properly measure, cut, and hand-weld details. GAF TPO accessories are 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.When the accessory is ready to install with no field fabrication, you'll find that installers not only save time but also achieve consistent quality in all the flashings while boosting their productivity.3. How Does Fabricated Edge Metal Save Time?Fabricating edge metal in the field requires time and experience, not to mention the additional equipment needed to form the metal. GAF Perimeter Edge Metal saves hours of time in the field, and the coping, drip edges, fascia, and accessories are easy to install with features like prepunched holes to ensure the secure termination of the membrane.Because all GAF edge metal is tested and compliant with the ANSI/SPRI ES-1, FM, Miami Dade, and Florida Building Code for IBC, you can have confidence in knowing that the most critical point on the roof—the perimeter—has the highest protection.4. What Is a Self-Adhered Roofing System?A self-adhered roofing system is up to 60% faster to install than a roof that is traditionally adhered. Self-adhered TPO eliminates the need to apply adhesive altogether. EverGuard® SA TPO Self-Adhered Roof Membrane 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. The crew then uses a weighted roller and heat-welds the seams.You not only save time during the installation, but you also save time cleaning up the jobsite as there are no buckets, rollers, or containers to dispose of.5. How Does a Self-Adhered Vapor Barrier Work?GAF SA Vapor Retarder XL relies on an advanced, high-tack butyl rubber adhesive and is self-sealing, resulting in three times the peel strength of modified bitumen self-adhered vapor barriers.It also saves time right off the bat by eliminating the need for primer prior to installation. The large, six-square rolls reduce the number of rolls needed per job, resulting in fewer seams. Its extreme durability allows it to be left exposed to the elements for up to six months when properly installed, plus it provides a slip-resistant walking surface for added safety.6. Can Using PVC Save Time?Time studies have proven that EverGuard® PVC can be installed up to 50% faster than traditional adhered systems when using EverGuard® PVC Quick-Lay Adhesive. PVC is extremely versatile when it comes to installation methods as it can be adhered, mechanically attached, or induction welded. Available accessories and adhesives also speed up the installation.7. How Can Wider Membrane Rolls Save Time?When 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, known as extra-wide roll roofing. GAF offers 12-foot-wide rolls of membrane that are ideal for jobs with large, open rooftop areas. As well as providing more coverage in less time, these 20%-wider rolls mean fewer seams to weld.Learn from the Highly Trained Professionals at GAFGAF offers a robust video library featuring roofing veterans Dave Scott and Wally Brown. Their Roofing It Right series features how-to videos, including a self-adhered membrane product overview. These videos cover topics as diverse as roof inspections, core cuts, tear-offs, and installations.The GAF Commercial team offers step-by-step support with highly trained, regionally based professionals who can understand your unique challenges in tapered design, product installation, energy efficiency, sustainability, and more. Find your local team and save time.

By Authors Karen L Edwards

October 13, 2023

the layers of a built up roof
Commercial Roofing

What Is a Built Up Roof?

A built up roof system is a popular choice for buildings with low-slope or flat roofs. Often referred to by the acronym BUR, this system has been used for 100-plus years in the U.S.What makes BUR systems so popular? They are known for providing excellent protection due to their redundant nature because they are made up of multiple layers of ply sheets and asphalt. These layers are then topped off by a cap sheet or a flood coat of asphalt and granules. The multiple plies provide resistance to weather and heavy-duty protection for the building.Components of a Built Up Roof SystemBuilt up roof systems can be constructed in a variety of ways. Often, the built up roof system starts with a base sheet installed over the polyisocyanurate (polyiso) insulation or cover board, typically through the use of mechanical fasteners. The base sheet serves as the bottom layer of waterproofing protection for the roof system and provides a surface that will allow subsequent sheets to be adhered with hot asphalt.A layer of asphalt is applied over the base sheet for the installation of reinforcing felt, sometimes called a ply sheet. Many people picture kettles of hot asphalt being mopped onto the base sheet in order to install the ply sheet, but advances in manufacturing have created alternative options. For instance, contractors can choose to use cold-applied adhesive solutions instead of hot mopping asphalt and kettles.When saturated in asphalt or cold-applied adhesive, the reinforcing felt creates a barrier that provides additional resistance to water intrusion. The process is repeated with the application of asphalt or cold-applied adhesive, followed by the installation of additional plies until the desired number of plies is achieved. The system is then either capped with a mineral-surfaced cap sheet or topped off by covering the top layer with asphalt and spreading gravel or slag.This video provides an easy-to-understand look at the layers that make up a typical four-ply system.Benefits of Built Up RoofingBuilt up roofing owes its popularity to a number of benefits it provides, including:Time-tested technology. It's hard to argue with more than 100 years of history.Redundancy. Built up roofs provide many layers of protection, so if the top layer is damaged, the additional layers below will continue to protect the building from water intrusion.Guarantees/Warranties. BUR systems may be eligible for guarantees or warranties of up to 20 years, depending on the materials used and the system installed. Check with the manufacturer for guarantee/warraaty requirements and coverage.Reflective cap sheets available. White-coated cap sheets are availableto help reflect the sun's rays away from the building, which can help lower internal termperatures.There are many options when it comes to choosing an asphaltic roofing system, each with different benefits. When choosing your system, the best place to start is by determining the characteristics you want in the roof. You can review this brochure to see a comparison of the different products, learn about their features, and browse available guarantees. Of course, you can always talk to GAF to help you find the best solution.

By Authors Karen L Edwards

August 25, 2023