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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... Tests of Apartment Dwelling Units . 25 cents BSS11 . Fire Resistance of Steel Deck Floor Assemblies . 25 cents BSS12 . Performance of Square - Edged Orifices and Orifice - Target Combinations as Air Mixers . 15 cents BSS13 . Shrinkage ...
... Tests of Apartment Dwelling Units . 25 cents BSS11 . Fire Resistance of Steel Deck Floor Assemblies . 25 cents BSS12 . Performance of Square - Edged Orifices and Orifice - Target Combinations as Air Mixers . 15 cents BSS13 . Shrinkage ...
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... veloped . It was conceded , following Laurie , that ( 1 ) ordinary impact tests were not satis- 1 Figures in brackets indicate the literature references at the end of this paper . perature much below the freezing point of water , the 1.
... veloped . It was conceded , following Laurie , that ( 1 ) ordinary impact tests were not satis- 1 Figures in brackets indicate the literature references at the end of this paper . perature much below the freezing point of water , the 1.
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... tested . The physical layout of the apparatus is shown in figure 2 . The apparatus consisted of a specimen ( tar- get ) area ( 1 ) , timing range ( 2 ) , gas gun ( 3 ) , gas cylinder ( 4 ) , timer ( 5 ) , hailstone carrier ( 6 ) ...
... tested . The physical layout of the apparatus is shown in figure 2 . The apparatus consisted of a specimen ( tar- get ) area ( 1 ) , timing range ( 2 ) , gas gun ( 3 ) , gas cylinder ( 4 ) , timer ( 5 ) , hailstone carrier ( 6 ) ...
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... tested . These shingles had been exposed at a 4 - in pitch ( 10 cm in 30 cm ) facing due south . Three different Type 210 shingles showed fail- ures ( felt cracking ) on all three areas of dif- ferent vulnerability with 114 - in ( 3.2 ...
... tested . These shingles had been exposed at a 4 - in pitch ( 10 cm in 30 cm ) facing due south . Three different Type 210 shingles showed fail- ures ( felt cracking ) on all three areas of dif- ferent vulnerability with 114 - in ( 3.2 ...
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... tested at 120 ° F ( 49 ° C ) . on a 1 / 2 - in ( 1.3 cm ) plywood deck with a 15 lb saturated felt underlayment ... tested . The construction of these roofs and the results of the hail - resistance tests are sum- marized in table 3 . The ...
... tested at 120 ° F ( 49 ° C ) . on a 1 / 2 - in ( 1.3 cm ) plywood deck with a 15 lb saturated felt underlayment ... tested . The construction of these roofs and the results of the hail - resistance tests are sum- marized in table 3 . The ...
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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