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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... Deck Floor Assemblies . 25 cents BSS12 . Performance of Square - Edged Orifices and Orifice - Target Combinations as Air Mixers . 15 cents BSS13 . Shrinkage and Creep in Prestressed Concrete . 15 cents BSS14 . Experimental Determination ...
... Deck Floor Assemblies . 25 cents BSS12 . Performance of Square - Edged Orifices and Orifice - Target Combinations as Air Mixers . 15 cents BSS13 . Shrinkage and Creep in Prestressed Concrete . 15 cents BSS14 . Experimental Determination ...
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... deck , just as in service , and clamped in place against the back- stop in position ( 1 ) . The timing range consists of a metal frame of 34 - in ( 1.9 cm ) angle iron on which are mounted two microswitches 2.0 ft ( 61 cm ) apart . The ...
... deck , just as in service , and clamped in place against the back- stop in position ( 1 ) . The timing range consists of a metal frame of 34 - in ( 1.9 cm ) angle iron on which are mounted two microswitches 2.0 ft ( 61 cm ) apart . The ...
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... deck ) or to various types of insulation mopped solidly to these decks . Also , where metal decking was used , the insulation was mopped solidly to the decking . 3.1 . Shooting Hailstones at Roofing The specimen on its deck was held ...
... deck ) or to various types of insulation mopped solidly to these decks . Also , where metal decking was used , the insulation was mopped solidly to the decking . 3.1 . Shooting Hailstones at Roofing The specimen on its deck was held ...
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... decks on which the shingles were mounted . Smallest hail size cracking shingle felt Deck 15 # Felt underlayment Edges Unsupported portion Triple coverage Edges Unsupported portion Triple coverage in cm in ст in cm in ст in cm -in ...
... decks on which the shingles were mounted . Smallest hail size cracking shingle felt Deck 15 # Felt underlayment Edges Unsupported portion Triple coverage Edges Unsupported portion Triple coverage in cm in ст in cm in ст in cm -in ...
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... deck with a 15 lb saturated felt underlayment . The hail resistance of the Type 235 shingle was in- creased to the 212 - in ( 6.4 cm ) hailstones from the 12 - in ( 3.8 cm ) hailstones on all three sur- faces . That of the Type 315 ...
... deck with a 15 lb saturated felt underlayment . The hail resistance of the Type 235 shingle was in- creased to the 212 - in ( 6.4 cm ) hailstones from the 12 - in ( 3.8 cm ) hailstones on all three sur- faces . That of the Type 315 ...
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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