![]() Another application of this material is done with hot asphalt. There is also a cold-applied adhesive application process, and some self-adhesive forms of this system. ![]() In a torch application process the sheets are heated to melt the asphalt together and create a seal. There are several ways of connecting pieces of this material. Modified bitumen roofing materials resist expansion and contraction and reflect UV rays. It is made from asphalt with a mineral-based wear surface and a variety of modifiers and solvents. This type of roofing is an evolution of asphalt roofing and is also referred to as APP or SBS. This type of roof will last typically 10 to 25 years or more if properly maintained but many factors including but not limited to weather, sun exposure, application, decking, roof slope, and traffic on the roof. Depending on the application and amount of flashing detail on the roof the TPO roof can be the most cost effective. ![]() It can be fully adhered to the roof decking, mechanically fastened or ballasted. TPO sheets are typically white which helps to reflect UV rays and are made with flame retardants, UV absorbers for those rays not deflected, and other properties to increase longevity of the material. The most common material used for this type of roof is TPO although there are others available such as PVC. Even though this type of material is light and thin, it is attached directly to the roof decking which eliminates the need for gravel or weight to hold it down. ![]() This material resists expansion and contraction and reflects UV rays. Rubber or EPDMĮPDM is made mostly of flat synthetic rubber pieces that are welded together at the seams to form one continuous membrane. However, many factors (including but not limited to weather, sun exposure, application, decking, roof slope, and traffic on the roof) can affect its longevity. This type of commercial roof will typically last 10 to 25 years or more if properly maintain. But keeping the drains and gutters free of gravel is an essential piece to maintaining this roof type.Īsphalt roof material was fairly inexpensive in the past but has been increasing in terms of cost over the years due to the price of oil. A building with windows that overlook a portion of gravel roof can have a more attractive view of river rock gravel rather than just a black rubber. A layer of gravel on an asphalt roof does help with to deflect UV exposure, lends weight to the roofing material to keep it in place, and acts as a fire retardant. Repairs for asphalt roofs with gravel are time consuming due to the fact that the gravel can hide any suspect leak areas. The structure of the building may need to be reinforced as this type of roof can be quite heavy. Improper installation can cause many roofs to leak early on requiring more maintenance and repairs. If not applied properly it can be difficult to create a proper seal at all seams and connection points. However, there are more advanced forms of materials that do not require a gravel coating. It is made up of hot asphalt and often covered with gravel. This is the most traditional of the types of commercial roofs. Types of Commercial Flat-Roof Systems Asphalt or Built-Up Roof Many systems come with a 20-year warranty if the system is installed on the bare roof deck. For example certain roof types needs insulation applied first, the number of layers that need to be applied, what type of existing roofs are there (tear off or not), what type of decking is there, etc. ![]() In terms of cost, there are many factors that play in to the types of commercial roofs that can increase or decrease the overall expenditure. In addition cost, longevity, and long term maintenance are dependent on a number of influences and are extremely customized to each building. A variety of roofing systems are available for commercial roofing. ![]()
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