Modified bitumen roofing systems
Roofing with modified bitumen (mod-bit) offers a variety of technologies and installation methods. With proven historical performance and time-tested durability, mod-bit roofing products are a go-to material of choice for high-end low-slope buildings.
Understanding modified bitumen roofing
As parts of the asphaltic family of roofing solutions, SBS & APP Modified Bitumen and BUR are among the oldest and most common roofing technologies in use today, providing a reliable solution for both residential and commercial properties. Commercial asphalt roofing systems consist of two or more waterproofing layers, offering redundancy for durable waterproofing protection.
Explore mod bit productsField-proven for decades, GAF Mod-Bit roofing provides durability and performance
Weather resistance and durability
Thanks to high-quality raw materials and rigorous quality control, GAF SBS and APP Mod Bit and BUR roofing solutions provide durability and weather resistance for the long haul.
Solar-reflective options
Make GAF SBS and APP mod-bit membranes part of your cool-roof solution. Solar Reflective Cap Membranes, including EnergyCap™ and UltraClad™ Membranes, rated by the Cool Roof Rating Council, are now available.
Hybrid solutions
Hybrid systems can increase the overall robustness of the assembly by combining characteristics of multiple roofing technologies, such as SBS Mod Bit and TPO.
Competitive limited guarantees
GAF No-Dollar-Limit commercial limited guarantees up to 35 years are available for qualifying systems.
Partner with a GAF Territory Manager
Whether you're looking to confirm local material availability, discuss technical details with a field service pro, check a limited warranty, learn about innovative labor-saving products, or arrange hands-on training for your crew, your first call should be to your GAF Territory Manager. They can connect you, fast, with the resources and information you need.
Sample GAF mod bit and BUR roof system assemblies
SBS (estireno-butadieno-estireno)
SBS (Styrene Butadiene Styrene)-modified asphalt allows these membranes to achieve greater elongation ratings than other asphaltic systems. Can be hot-mopped, cold-applied, heat-welded, or self-adhered.
Explora membranas SBS
APP (polipropileno atáctico)
APP (Atactic Polypropylene)-modified asphalt helps the roofing membrane to achieve durability and protection against the damaging effects of UV rays and weather elements. Typically torch-applied.
Explora membranas APP
BUR (techo multimembrana)
BUR involves melting bricks of asphalt and applying it between base, ply, and cap sheets with mops (hot mopping). Some jobs are finished with a layer of gravel overburden over the last layer of asphalt.
Explora membranas BUR
Comparaciones de productos de sistemas de techos de SBS, APP y BUR
SBS y APP son polímeros con características exclusivas, y las membranas fabricadas con ellos se clasifican por números, tipos y grados de ASTM. BUR es un método de ensamblaje mediante el que se instalan múltiples capas de fieltros con asfalto caliente entre ellas.
Installation methods for mod bit roofing systems
Por asfalto caliente
Blocks of asphalt are melted in a large kettle and spread on the roof with mops .This is one of the oldest asphalt roofing techniques, and still provides a durable, water-resistant seal today.
Aplicado por soldadura por calor/soldadura con soplete
The installer melts the underside of the asphalt membrane using a torch. This allows the sheet to adhere to the substrate below.
Con aplicación en frío
The installer attaches the roofing membrane to the substrate or previously applied layer of roofing material with a liquid adhesive (e.g, Matrix 101) using a notched squeegee or applicator gun.
Autoadherente
Self-adhered asphaltic membranes include a factory-installed adhesive, protected by a film backing. The membrane is rolled out, and the film backing gets peeled away to expose the adhesive.
Project profiles: GAF asphaltic roofing systems
Get inspired for your next Mod Bit roofing system project with these real-life GAF asphaltic profiles.
Northeast Middle School
Asfáltico
La sustitución del antiguo sistema de techo requirió una cuidadosa coordinación y logística para minimizar las interrupciones en el funcionamiento de la escuela.
Departamentos para vivienda Mosaic Ultra Urban
Asfáltico
Ganador del premio ARMA Quality
Asphalt Roofing Case-Study
Preguntas frecuentes
The most common misconception about mod-bit roofing is that it can't be part of a cool roof system solution. Modern granule technology, such as GAF EnergyCap™ granules in Bright White and Ultra Bright White provide CRRC-rated reflectance to your asphlat roofing system.
Durable and long-lasting, GAF mod-bit and BUR roofing systems are eligible for No Dollar Limit guarantees up to 35 years for qualifying systems.See the Commercial Roof Warranty Comparison Guide for details.
Like any roof, regular inspections and maintenance (patching leaks, clearing debris) can help extend the functional life of your mod bit roof. GAF proporciona una lista de verificación de mantenimiento programado que contiene algunas herramientas e información importantes para ayudarte a maximizar el rendimiento de tu nuevo techo, y garantizar su cobertura, durante muchos años.
Choosing the right roofing system depends on many factors, including (but not limited to) budget, size, building use, climate, and potential sustainability goals. For assistance selecting between an asphaltic system and a single-ply system, visit the GAF Commercial Roof Selector. Answer a handful of quick questions about your upcoming roof project to receive detailed roof system recommendations that reflect your climate zone, building type, insulation needs and more.