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Built Up and Modified Roofs

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Need to know more about built up and modified roofs in Westchester County and Fairfield County? Just ask L&M Roofing.

With so many options for commercial roofing out there, we know that it can get a bit confusing. Let L&M Roofing lay it all out for you. Built up roofing is the most common type of roofing used in commercial, industrial and institutional buildings. It is the process of layering multiple layers of bitumen and ply sheets to form your new waterproof roof. The components of this roofing system are:

  • roof deck
  • vapor retarder
  • insulation
  • membrane and surfacing material

The roofing membrane is the heart of the built up and modified roofs in Westchester County and Fairfield County, and it consists of roofing bitumen and multiple reinforcing piles of roofing felt. Roofing bitumen is the primary adhesion/waterproofing agent used between roofing piles. Modified bitumens use a traditional waterproofing medium such as asphalt, and then modify it by adding agents to create a uniform matrix that enhances the physical properties of the asphalt. There are two main modifiers recommended by L&M Roofing, they are:

APP ROOFING SYSTEMS

APP (Atactic Polypropylene) is a thermoplastic polymer that is added to roofing bitumen to create a high performance roofing membrane that is ideal for anyone in the market for built up and modified roofs in Westchester County and Fairfield County. It modifies the asphalt by creating a uniform matrix within it. This enhances the bitumens performance by increasing its resistance to the sun’s damaging UV rays. It increases its flexibility at low temperatures and improves its high temperature flow resistance. These characteristics are what make it a superior choice for built up and modified roofs in Westchester County and Fairfield County. APP modified bitumen sheets can be applied by either the hot or cold methods. Propane fueled torches are used to soften the modified bitumen that is on the underside of the sheet turning it into a molten adhesive which are then applied to the roof and then gone over with either a squeegee or some other tool to press the sheet down and ensure adhesion. This is the most common method of application. Some APP Modified bitumen sheets can be applied using a cold process.

SBS ROOFING SYSTEMS

SBS (Styrene-Butadiene-Styrene) is used to modify the asphalt by forming a polymer network within the bitumen. This gives the bitumen rubber-like characteristics which in turn give the modified bitumen sheets improved resistance to aging and weathering. This makes SBS modified bitumen a superior choice for built up and modified roofs in Westchester County and Fairfield County. Like APP modified bitumen sheets SBS modified bitumen sheets can be applied using either a hot or cold method, but unlike APP modified bitumen sheets are not generally formulated for torch application. Although, they can be formulated for torch application if the situation calls for it. They are most commonly applied using a hot mopping technique. This is done by applying a thin, uniform layer of hot modified bitumen to the roof, then layering on the felts. Once the felts are in place a broom or squeegee is pulled over it applying enough pressure to ensure that the felt is embedded in the modified bitumen. If the contractor chooses not to use this method they may be applied using cold-process adhesives. SBS-modified bitumen sheets that do not have factory applied granule or foil surfacing need some form of field-applied ultraviolet protective coating. The result is a roofing system with significantly enhanced performance capabilities making it an ideal solution for anyone needing built up and modified roofs in Westchester County and Fairfield County.

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