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Built-Up-Roofing buy in Sioux City
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Built-Up-Roofing

Built-Up-Roofing

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Description

BURs are the toughest of the roofing systems. Where pedestrian traffic is high, a BUR roof system has no equal. A BUR roofing membrane is constructed on the roof by combining layers of materials (roll goods) together and in their total they act as the roofing membrane. In the matrix of a traditional BUR membrane, tar or asphalt act as not only the glue which binds or adheres together the three to four layers of sheet-fabric roll goods, but that very tar or asphalt also acts as the main waterproofing component/ingredient which is being held/contained in place by those three to four layers of sheet-fabric. Hot tar (also known as 'coal-tar-pitch') has been virtually replaced by hot asphalt, but hot tar remains an outstanding product because of its ability - after it has been installed - to easily melt and flow into voids giving it the title "self-mending."

Modified BUR - In the last thirty years, traditional BURs have been somewhat replaced by new high-bred membranes called "Modified Roofing Sheets." These modified sheets (roll goods) don't rely solely on tar or asphalt to be the heart of the membrane; the new sheets are themselves a manufactured complete preassembled waterproofing membrane. Modified sheets are made by modern formulations that include rubber as well as asphalt materials held together with fabric now called scrim. Two layers of these modified sheets can provide an excellent finished roofing membrane. The layers of modified sheets can be adhered together by using hot asphalt, fully torching them together with open flames, with cold adhesives, with cold adhesives that have their side laps torched or heat welded, or some modified sheets come complete as self-adhering sheets. Modified roofing systems are commonly put down in two or three layers; the bottom layer is commonly known as the base-sheet, the central layer is the interply, with the top layer or the finishing layer known as the cap-sheet.
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