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APP modified bitumen is asphalt with APP (Atactic Polypropylene) added to give it some plastic properties. APP is a thermoplastic polymer.
When added to bitumen, atactic polypropylene:
APP membranes can have a smooth surface or include surfacing material such as aluminum, copper or mineral granules.
Polymer-modified roof membranes have been in use in the U.S. since the mid '70s. APP modified bitumen roofing materials are produced in factories and sold in sheets or rolls.
Modified bitumen roofing is generally low-maintenance and can last for decades. Manufactured APP membranes also contain an insulating layer for a more energy efficient roof. Whether you need a new flat roof installation, reroofing, repairs or a modified bitumen roof inspection, Infinity Exteriors is the best commercial roofer for the job. Contact us for a free quote!
To create a roofing membrane, APP modified bitumen is reinforced with polyester plies. The polyester sheets are dipped in heated modified bitumen, put through a rolling cylinder and cooled. Finished rolls of APP modified bitumen have extra asphalt on the back. In torch down application the heated asphalt bonds to the roof substrate forming a durable and resilient membrane.
Rolls of APP mod bit membrane cover approximately 100 to 110 square feet per roll. The roof substrate determines whether a single, 2-ply or 3-ply system is installed. APP modified bitumen membranes can also be used in built-up roofs (BUR), making a hybrid roofing system.
Compared to SBS modified bitumen (which has synthetic rubber added to it), APP modified bitumen has a higher melting point. APP is also better at withstanding damage from UV rays, making it less likely than SBS to blister or crack. This makes APP more suitable for flat roofs in very hot climates, such as in the southwest US.
APP modified bitumen roofing is quite efficient to install. However here in Wisconsin SBS modified bitumen membranes are often preferred because they have greater flexibility in cold temperatures.
APP modified bituminous sheets are inherently waterproof and provide excellent tensile strength. The key to maximizing the performance of APP waterproofing membranes on flat roofs is with expert torch-on application done in exact accordance with the manufacturer’s specifications.
The highly trained and experienced commercial roofers at Infinity Exteriors work with precise attention to detail. We guarantee compliance with manufacturer warranty requirements and a perfect installation. You pay nothing until you’re completely satisfied!
GAF roofing materials ensure reliable, durable roof construction able to withstand even the harshest Wisconsin weather. GAF industry-leading warranties provide lifetime guarantees on certified roofing systems.
Infinity Exteriors roofing contractors use only the highest quality brands of APP modified bitumen membranes and other commercial roofing materials. Contact us today for more information on Ruberoid® Torch Smooth Membrane or other GAF roofing materials!
Infinity Exteriors builds the best commercial roofs in Wisconsin. Our expert roofers are full-time employees with extensive experience and training. We have highly competitive pricing compared to commercial roofing contractors offering equivalent workmanship and warranty. For a waterproof, energy efficient and durable flat roof, you can’t do better than Infinity Exteriors.
Infinity Roofing offers free repair estimates, competitive pricing, and transparent costs. Other roofing contractors in Wisconsin wish they could do what we do! Our company HQ and showrooms are in the Milwaukee Metro area and we’ve roofed more Wisconsin homes and businesses than anyone else!
Your neighbors love our work. Click on any location to see a map of our roofing installation that proves it.
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