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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... Base sheet +3 plies of 15 lb. organic felt + a 60 lb / sq ( 2.9 kg / m2 ) asphalt flood coat [ 20-25 lb / sq ( 1.0-1.2 kg / m3 ) interply asphalt ] ( la ) in ( 1.8 cm ) Plywood .. on ( 1b ) 1 - in ( 2.5 cm ) Fiberboard on -in ( 1.3 cm ) ...
... Base sheet +3 plies of 15 lb. organic felt + a 60 lb / sq ( 2.9 kg / m2 ) asphalt flood coat [ 20-25 lb / sq ( 1.0-1.2 kg / m3 ) interply asphalt ] ( la ) in ( 1.8 cm ) Plywood .. on ( 1b ) 1 - in ( 2.5 cm ) Fiberboard on -in ( 1.3 cm ) ...
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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 ice spheres impact 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 felts polyethylene Portland Cement prepared roofings Products Sidney H reported Resistance of Roofing resistant to hail shingles showed sizes of hailstones slag solidly supported areas specimen steel decking substrates tested Type 235 shingles U.S. DEPARTMENT U.S. Government Printing velocity 9