Article Abstract:
Commercial roof systems firm Centimark Corp has become convinced about the capabilities of spray polyurethane foam (SPF). Centimark installs 1.25 million sq ft of SPF worth $240 million annually. The firm is considered a major player in the SPF market, with service crews in Phoenix, Los Angeles, Stow, OH, and Pittsburgh. Centimark realizes the importance of correct SPF installation methods and has sent its personnel to the Polyurethane Roof Training Center.
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Article Abstract:
More roofing contractors are installing built-up roofing (BUR) and modified bitumen systems, according to the 1998 State of the Industry Report by Roofing Siding Insulation magazine. Hybrid systems, a combination of BUR base sheet and modified bitumen cap, are installed by 90% of commercial roofing contractors, up 4% since 1996. Contractors also report that modified bitumens are the most versatile among roofing materials.
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Article Abstract:
Current polymer technologies can enhance the performance of BUR, modified bitumen and single plies as labor costs for sprayed polyurethane foam (SPF) account to only 10%-15%, which is lower than 50% or more for other systems. Labors costs could be reduced further by employing robotic equipment for SPF, which can be utilized to insulate and provide another layer of waterproofing redundancy within modified bitumen, single plies and BUR.
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