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Dos techistas instalando un revestimiento de silicona para techos en un edificio comercial.
Commercial Roofing

Ventajas de los revestimientos de silicona para techos

Como contratista comercial de construcción de techos, usted es responsable de elegir los materiales adecuados para cada trabajo. Con tantas opciones disponibles, tomar una decisión puede resultar una tarea difícil.Cada vez más, los profesionales del sector están optando por los revestimientos de silicona para techos por su fuerza y durabilidad. Este tipo de revestimientos sirve para extender la vida útil de un techo con una estructura firme y, posiblemente, para que los propietarios ahorren tiempo y dinero al retrasar la reparación completa del techo. Además, sus propiedades de restauración funcionan a la perfección con la mayoría de los sistemas comerciales de construcción de techos, como el EPDM, de fieltro, de betún y de metal.¿Qué son los revestimientos de silicona para techos?Los revestimientos de silicona son revestimientos de protección, alto rendimiento e impermeables para techos. Al agregar este revestimiento a un techo con una estructura firme, se puede extender la vida útil del techo existente. La silicona es un componente inorgánico, por lo que mantiene sus propiedades a la intemperie. A su vez, es un material flexible que puede absorber la mayor parte del movimiento normal de un techo a fin de evitar el agrietamiento y la pérdida de sus capacidades de protección.Beneficios de los revestimientos de silicona para techosAdemás de su flexibilidad y su capacidad para extender la vida útil del techo existente, los revestimientos de silicona ofrecen una serie de beneficios. Laura Soder, gerenta sénior de productos líquidos y revestimientos de GAF, explica que los revestimientos de silicona de GAF están diseñados para proteger el techo de filtraciones y ofrecer otras ventajas relacionadas.Protección contra rayos UVEl principal beneficio de los revestimientos de silicona es la protección contra los rayos ultravioleta (UV). "La fórmula de la silicona de GAF incluye dióxido de titanio, lo que ofrece una estabilidad excepcional contra los rayos UV y una reflectancia solar alta", afirma. Esta protección UV ayuda a reducir la temperatura del techo, lo que se traduce en un mejor funcionamiento de las unidades de techo.RentabilidadLos revestimientos de silicona son soluciones rentables que sirven para retrasar el costo de los materiales y la mano de obra necesarios para reemplazar el techo en su totalidad. Funcionan de manera excelente con la mayoría de los techos comerciales y se acoplan especialmente bien con los techos de metal.Restaura el techo existente y extiende su vida útilSoder señala que los revestimientos de silicona se adhieren bien a los techos de metal, lo que los convierte en una excelente opción para extender la vida útil de este tipo de techos. Antes de su aplicación, cepille el óxido ligero o trate específicamente las zonas con más óxido. "Hay muchos techos de metal instalados y, para aquellos que tienen una estructura firme y solo requieren una restauración moderada, se puede agregar con facilidad años de vida útil al techo al revestirlo con silicona", sostiene.Resistente a la humedadLos revestimientos de silicona también son conocidos por su capacidad de resistencia a la humedad. Como la silicona es inorgánica, resiste la degradación en zonas en las que el agua se acumula, lo que la convierte en una opción ideal para áreas con muchas lluvias o nieve.Funciona en climas calurosos y fríosLa silicona tiene un amplio rango de temperaturas en las que se puede aplicar. Al no contener agua, puede aplicarla en temperaturas más bajas que el acrílico y otros revestimientos de techo. Proporciona una capa de impermeabilización monolítica y sin fisuras por encima de los techos de metal existentes. Además, la silicona se contrae y expande junto con el metal en climas fríos y calurosos.En qué se diferencian los revestimientos de silicona de los revestimientos elastoméricosEn comparación con el acrílico y otros revestimientos elastoméricos para techos, la silicona tiene ciertas ventajas.Los acrílicos son revestimientos de protección a base de agua con resistencia a los UV, pero no deben instalarse en lugares donde se acumula el agua, ya que podrían romperse y comenzar a deslaminarse. La silicona es un material que se termina de curar con la humedad, lo que significa que reacciona con la humedad del aire y se seca hasta lograr una película.Soder explica que ambos materiales son flexibles y adecuados para su uso sobre el metal. Pero, si hay agua estancada, el acrílico no es la mejor opción. "Si bien la silicona es más costosa, en general, se degrada a un ritmo mucho más lento que otros revestimientos", sostiene. Ahora bien, una de las desventajas de la silicona en comparación con otros revestimientos elastoméricos para techos es que es resbaladiza cuando está mojada.Recorrido por la instalación y aplicaciónSi bien los revestimientos de silicona pueden extender la vida útil de un techo existente, Soder sostiene que es mejor instalar el revestimiento antes de que finalice la vida útil de la membrana existente.Como las filtraciones suelen ocurrir en las juntas de los techos, puede agregar sellador de silicona en esas zonas. La fórmula de los selladores difiere de la de los revestimientos: en la de los selladores se utilizan otros polímeros de silicona, lo que los vuelve más robustos y pesados. Los selladores de silicona están formulados para las zonas de mucha presión y pueden ayudar a absorber el movimiento en puntos críticos del techo. Funcionan junto a un revestimiento de silicona para la protección del techo.Antes de aplicar cualquier revestimiento, asegúrese de que el techo esté limpio, seco y firme. "Limpio significa libre de contaminantes, polvo, aceites, hojas y otros desechos", explica Soder. Puede usar el concentrado de limpieza de GAF para hidrolavar el techo.Como la silicona se termina de secar con la humedad, el techo debe estar seco antes de aplicarla. Revestir una superficie húmeda puede afectar la adhesión del material y es uno de los errores más grandes que puede cometer en el momento de la instalación. Queremos que el revestimiento comience el proceso de secado por la humedad del aire, no de la humedad en el techo.Cómo aplicar revestimientos de siliconaLa aplicación de un revestimiento de silicona para techos implica cinco pasos:Limpiar los desechos del techo y probar que el revestimiento se adhiera correctamente a la superficie.Asegurarse de que el techo esté firme. Reparar las láminas de metal rotas y reemplazar los sujetadores que falten o estén dañados.Tratar todas las juntas y sujetadores con sellador de silicona, como GAF Silicone Mastic. Se debe aplicar con un cepillo a un grosor de 60 milésimas de pulgada o 1/16 pulgadas mojado.Usar el mismo sellador en los bordes, entradas y drenajes.Por último, aplicar el revestimiento de silicona para techos a todo el techo. Algunos revestimientos, como GAF Unisil Silicone, requieren dos capas, mientras que otros, como GAF High Solids Silicone, necesita solo una.Entender las necesidades de mantenimiento y la durabilidadEl mantenimiento de un revestimiento de silicona para techo es fundamental. Abordar los problemas antes de que se vuelvan más difíciles ayuda a minimizar los costos de las reparaciones y maximizar la vida útil del revestimiento.Como el techo se contrae y expande con el tiempo, se pueden producir algunos problemas con las juntas. Una buena regla de oro es hacer inspeccionar el techo cada seis meses. Aplicar un sellador de silicona puede servir para tratar las zonas con filtraciones o grietas. El sellador de silicona es estable contra los rayos UV y no necesita una capa final, según Soder.Agregar revestimientos de silicona para techos a la caja de herramientasCon tantos beneficios, los revestimientos de silicona para techos deberían ser la primera opción en los proyectos de planificación de restauración del techo. Además, al tener tantas opciones disponibles, puede elegir el tipo que sea mejor para cada tipo de techo en el que trabaje. ¿Tiene más preguntas sobre los revestimientos para techos? Los representantes del servicio técnico de GAF estarán encantados de asistirle con su nuevo proyecto de revestimiento.

By Authors Mark Soto

November 20, 2024

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 Authors Mark Soto

October 15, 2024

Roofers install GAF EverGuard® TPO Quick-Spray Adhesive on a flat roof
Commercial Roofing

Minimizing Disruption When Repairing Roofs on Schools and Hospitals

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 LaborAnother GAF tool can help you reduce the time spent on projects: GAF QuickMeasure™ Reports.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 a predominate pitch of 0 or 1, and a DXF file output for CAD.There is also the ability to add on local design criteria and hail and wind history to help inform design decisions.With the help of 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.

By Authors Dawn Killough

August 30, 2024