FIRE-RESISTANT CELLULOSE-BITUMEN ROOFING SHEET AND METHOD OF MANUFACTURING
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United States of America Patent
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Issued Date -
Jul 25, 2013
app pub date -
Jan 18, 2013
filing date -
Jan 20, 2012
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Abstract
Bitumen-impregnated cellulose fiber sheets include on one of their main surfaces, an adhesive primer layer, and, deposited on this adhesive primer layer, a fireproof coating including expandable graphite. In a preferred embodiment of the invention, the expandable graphite has a trigger temperature lower than 300° C. and the layer of expandable graphite corresponds to a dry matter basis weight of 80 to 140 g/m2. The sheets have a fire resistance fulfilling in particular the European Standard EN 13 501-5. They are mainly intended to be used as covering material, and in particular, as roof covering material.
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