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). |
From inside the book
Results 1-4 of 4
Page 1
... various sizes were shot at roof assemblies at their free - fall terminal velocities . Indentations , granule loss and roofing fracture were observed . The following conclusions have been made from these results : ( a ) All roofing ...
... various sizes were shot at roof assemblies at their free - fall terminal velocities . Indentations , granule loss and roofing fracture were observed . The following conclusions have been made from these results : ( a ) All roofing ...
Page 3
... various sizes , cast the " hailstones " to approximate spheres more closely and explore areas of different vulnerability on various roof- ing systems . The work was primarily directed at bituminous roofing materials , but a sampling of ...
... various sizes , cast the " hailstones " to approximate spheres more closely and explore areas of different vulnerability on various roof- ing systems . The work was primarily directed at bituminous roofing materials , but a sampling of ...
Page 5
... 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 against the ...
... 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 against the ...
Page 8
... various sizes were left in the slag . In summary , each roofing membrane per- formed better on the denser substrates than on the lighter substrates , the roofings made with inorganic felts performed better than those made with organic ...
... various sizes were left in the slag . In summary , each roofing membrane per- formed better on the denser substrates than on the lighter substrates , the roofings made with inorganic felts performed better than those made with organic ...
Common terms and phrases
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