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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... hailstones at 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.
... hailstones at 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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... evaluating the hail resistance of roofings , in which synthetic hail- stones ( ice spheres ) of various sizes were shot at roof assemblies at their free - fall terminal velocities . Indentations , granule loss and roofing fracture were ...
... evaluating the hail resistance of roofings , in which synthetic hail- stones ( ice spheres ) of various sizes were shot at roof assemblies at their free - fall terminal velocities . Indentations , granule loss and roofing fracture were ...
Page 5
... Evaluating Failure Damage to roofing by hail falls into two gen- eral categories : ( 1 ) Severe damage , which leads to penetration of the structure by the elements and ( 2 ) Superficial damage , which affects ap- pearance but does not ...
... Evaluating Failure Damage to roofing by hail falls into two gen- eral categories : ( 1 ) Severe damage , which leads to penetration of the structure by the elements and ( 2 ) Superficial damage , which affects ap- pearance but does not ...
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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