Low-slope Commercial, Industrial, & Institutional Roofing
Low-sloped roofing, commonly referred to as “flat roofing,” is an industry onto itself. There are thousands of configurations to choose from. There are several roof deck types, insulation requirements, roof membrane requirements and other factors complicating the selection. To simplify the process, a professional roofing contractor should be involved to assist in selection of the appropriate roof system for the particular application in new construction or replacement applications.
There are several types of roofing membranes that are used on low-slope roof assemblies
There are basically two types of built-up roofing (also known as BUR). The difference is that either a coal tar pitch or asphalt waterproofing could be used as the waterproofing element between plies of reinforcing felt. There are advantages and disadvantages to each system.
Modified bitumen membranes are hybrids of the built up system, only pre-manufactured in the factory. The products come in rolls, and are modified asphalt or coal tar systems with a rubber added for low temperature and elongation characteristics. These products typically use a built-up membrane underlayment before application of the final modified bitumen membrane. Modified bitumen membranes can be torch-applied, self-adhered or mopped in place with hot bitumen. They always are surfaced with some type of topping system.
Single-ply roofing systems are just that, a single ply of a roofing material made from several types of polymer plastics and rubbers.
Ethylene Propylene Diene Monomer is manufactured into large sheets for application to insulation on a roof. The material can be loose laid and ballasted with rock or pavers to hold the membrane in place. It also can be fully or partially adhered as well. Seams and the membrane are adhered with contact adhesives, with seams sometimes sealed with a sealant. Toppings may or may not be required by the manufacturer in many cases. This product is available in black.
Polyvinyl Chloride Sheets are manufactured into rolls, and typically mechanically fastened to a roof deck assembly. Screws and plates are used to hold the roof membrane to the roof assembly. Seams are heat-welded together, and sometimes sealed with a lap sealant. PVC membranes are reinforced with a fabric scrim, and available in tan and white colors. A topping material may not be required on this membrane.
TerPolymer Olefins typically are fleece-backed sheet membranes that are adhered with adhesives to insulation. These products typically are white in color, and may be reinforced. There may or may not be a topping system used on these systems.
Garden or “Green Roofing” is a relatively new concept in the United States, with Chicago Roofing Contractors Association members leading the way in garden roof applications. Garden roofing has been used for centuries in Europe as a way to reduce the need for air conditioning in buildings. Garden roofs also may meet code requirements for reflectivity of roofing in urban area, reducing the heat-island effect.
The jury still is out about the amount of heat island reduction attained with garden roofing when asphalt roads and parking lots, plus building facades all radiate as much or more than roofing systems.
Solar power is one of the fastest growing, cleanest sources of renewable alternative energy. Both individuals and businesses in Florida can save money, take advantage of current tax incentives, and take steps towards going green. Residents of Florida can save money by installing solar in four ways: solar panel (photovoltaic) electricity, solar hot water, solar pool heating and attic ventilation systems. At Complete Roofing Solutions, we can help you find the right solar solutions for you!