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Maxwell Products, Inc. is a privately held, pavement maintenance products manufacturing company based in Salt Lake City, Utah. [1] Founded in 1975 by brothers Ted and Delwyn Maxwell, Maxwell Products manufactures asphalt and concrete pavement preservation products, including Elastoflex crack and concrete joint sealant, NUVO premium crack and concrete joint sealant, GAP Mastic, and GAP Patch.
However, coating asphalt shingles and built-up composition roofs requires more caution. The National Roofing Contractors Association’s (NRCA) director of technical services has stated "The roofing industry is aware of a number of issues that could have negative consequences for field application of coatings over asphalt shingle roof systems ...
Again, refined tar-based sealer offers the best wear characteristics (typically 3–5 years) while asphalt-based sealer may last 1–3 years. Petroleum-based sealer falls between refined tar and asphalt. There are concerns about pavement sealer polluting the environment after it is abraded from the surface of the pavement.
Once the damage has progressed or the affected area is large and extensive, a structural asphalt overlay or complete reconstruction is necessary to ensure structural integrity. Proper repair may include first sealing cracks with crack sealant, installing paving fabric over a tack coat, or milling the damaged asphalt.
In past decades attempts to protect concrete have included sealers ranging from wax to linseed oil. Today, high quality concrete sealers can block up to 99% of surface moisture. There are two main sealer categories: topical sealers (coatings) and penetrating sealers (reactive).
These application types of membrane roofing show distinct advantages over the previously more common flat roofing method of asphalt and gravel (commonly referred to as built-up-roofs or "BUR"). In asphalt and gravel application, it can be very difficult to create a proper seal at all seams and connection points.
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