Hail Resistance of Roofing ProductsBuilding Research Division, U.S. Institute for Applied Technology, 1969 - 9 pages A test was developed for evaluating the hail resistance of roofings, in which synthetic hailstones (ice spheres) of various sizes were shot at roof assemblies at their free-fall terminal v * elocities.Indentations, granule loss and roofing fracture were observed.The principal conclusion is that:All roofing materials have some resistance to hail damage, but as the size of the hail increases, a level of impact energy is reached at which damage occurs.This level lies in the range of 1 1/2 to 2 inch (3.8-5.1 cm) hailstones for most prepared roofings.(Author). |
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... Asphalt Roofing Manufacturers Association * * ( Formerly Asphalt Roofing Industry Bureau ) Building Research Division Institute for Applied Technology National Bureau of Standards Washington , D. C. 20234 DEPARTMENT NATIONAL BUREAU ...
... Asphalt Roofing Manufacturers Association * * ( Formerly Asphalt Roofing Industry Bureau ) Building Research Division Institute for Applied Technology National Bureau of Standards Washington , D. C. 20234 DEPARTMENT NATIONAL BUREAU ...
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... roofing 3.2 . Evaluating failure 4. Results 4.1 . Asphalt shingles 4.2 . Built - up roofs 4.3 . Nonbituminous roofing 5. Conclusions 6. References 9 9 66 Hail Resistance of Roofing Products Sidney H. Greenfeld A test.
... roofing 3.2 . Evaluating failure 4. Results 4.1 . Asphalt shingles 4.2 . Built - up roofs 4.3 . Nonbituminous roofing 5. Conclusions 6. References 9 9 66 Hail Resistance of Roofing Products Sidney H. Greenfeld A test.
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... asphalt shingles . ( f ) Built - up roofs on dense substrates tend to resist hail better than those on soft substrates . ( g ) Built - up roofs made with inorganic felts tend to be more hail resistant than those made with organic felts ...
... asphalt shingles . ( f ) Built - up roofs on dense substrates tend to resist hail better than those on soft substrates . ( g ) Built - up roofs made with inorganic felts tend to be more hail resistant than those made with organic felts ...
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... Asphalt Shingles When applied according to the recommenda- tions of their manufacturers , Type 235 square- tab shingles have three regions of different vulnerability : ( 1 ) The tab edges , ( 2 ) The sur- face over the unsupported areas ...
... Asphalt Shingles When applied according to the recommenda- tions of their manufacturers , Type 235 square- tab shingles have three regions of different vulnerability : ( 1 ) The tab edges , ( 2 ) The sur- face over the unsupported areas ...
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... asphalt coated felts , when impacted with 2 - in ( 5.1 cm ) hailstones . The roofing on glass fiber insulation ( 1g ) on steel decking was penetrated by 21 / 2 - in ( 6.4 cm ) hailstones . The flood coat of the built - up roof made with ...
... asphalt coated felts , when impacted with 2 - in ( 5.1 cm ) hailstones . The roofing on glass fiber insulation ( 1g ) on steel decking was penetrated by 21 / 2 - in ( 6.4 cm ) hailstones . The flood coat of the built - up roof made with ...
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15 cents air gun apparatus Applied Technology areas of different Asbestos cement asphalt flood coat Asphalt Roofing asphalt shingles automatic data processing building damage Building Research Building Science Series Built-up roofs Bureau of Standards Cement and Concrete Center Class C shingle Coal tar Concrete Properties cracking cylinder dense decks dents DEPARTMENT OF COMMERCE diameter different vulnerability felt damage Fiberboard on 1-in Foamboard free-fall terminal velocity freezing ft 61 cm Gas cylinder Glass fiber insulation hail damage hail resistance hailstone carrier Hailstone Molds Hailstorms ice spheres indentation Institute for Applied interply asphalt Interrelations Between Cement Joules kg/m² kg/m³ large hailstones launcher lb/sq Meteorol microswitches National Bureau Nonbituminous Roofing organic felt polyethylene Portland Cement prepared roofings reported Resistance of Roofing resistant to hail shingles showed Sidney H sizes of hailstones slag solidly supported areas specimen steel decking substrates tested Type 235 shingles U.S. DEPARTMENT U.S. Government Printing velocity 9 ст