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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... materials . The material for this series originates principally in the Building Research Division of the NBS Institute for Applied Technology . Published or in preparation are : BSS1 . Building Research at the National Bureau of ...
... materials . The material for this series originates principally in the Building Research Division of the NBS Institute for Applied Technology . Published or in preparation are : BSS1 . Building Research at the National Bureau of ...
Page 1
... 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 12 to 2 inch ( 3.8-5.1 cm ) hailstones for most ...
... 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 12 to 2 inch ( 3.8-5.1 cm ) hailstones for most ...
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... materials was determined. FIGURE 1. Hail storm distribution map . 7. Hailstone mold . 8. Triggering mechanism . FIGURE 2. perature much below the freezing point of water , the ice that forms does so rapidly and traps air in the process ...
... materials was determined. FIGURE 1. Hail storm distribution map . 7. Hailstone mold . 8. Triggering mechanism . FIGURE 2. perature much below the freezing point of water , the ice that forms does so rapidly and traps air in the process ...
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... materials with a grenade launcher and determined the thresh- old energy of damage . The velocities were con- trolled by the size of the charge in the blank cartridges used in the launcher . Because of the difficulties in controlling the ...
... materials with a grenade launcher and determined the thresh- old energy of damage . The velocities were con- trolled by the size of the charge in the blank cartridges used in the launcher . Because of the difficulties in controlling the ...
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Sidney H. Greenfeld. The hail resistance of building materials was determined by shooting progressively larger hailstones at different parts of these materials until failure occurred . 3. Procedures 4. Results TABLE 2. Hail resistance of ...
Sidney H. Greenfeld. The hail resistance of building materials was determined by shooting progressively larger hailstones at different parts of these materials until failure occurred . 3. Procedures 4. Results TABLE 2. Hail resistance of ...
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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