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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... 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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... 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 . ( h ) Coarse aggregate ...
... 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 . ( h ) Coarse aggregate ...
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... built - up roofs visual. All of the results reported are based on hail- stones of a given size traveling at velocities within 10 percent of the terminal velocities reported in table 1 for hailstones of that size . The results are ...
... built - up roofs visual. All of the results reported are based on hail- stones of a given size traveling at velocities within 10 percent of the terminal velocities reported in table 1 for hailstones of that size . The results are ...
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... Built - Up Roofs Occasionally in residential construction and much more frequently in commercial and in- dustrial construction relatively flat roofs are used . These roofs are not " factory manufac- tured , " but " built up " on the ...
... Built - Up Roofs Occasionally in residential construction and much more frequently in commercial and in- dustrial construction relatively flat roofs are used . These roofs are not " factory manufac- tured , " but " built up " on the ...
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Sidney H. Greenfeld. TABLE 3. Hail resistance of built - up roofs visual inspection b C , Surface cracked . D , Foamboard delaminated . F , Felts cracked . shattered . - , Not tested . TABLE 4. Threshold of hail damage for nonbituminous ...
Sidney H. Greenfeld. TABLE 3. Hail resistance of built - up roofs visual inspection b C , Surface cracked . D , Foamboard delaminated . F , Felts cracked . shattered . - , Not tested . TABLE 4. Threshold of hail damage for nonbituminous ...
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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