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 1-5 of 7
Page
... at roofing 3.2 . Evaluating failure 4. Results 4.1 . Asphalt shingles 4.2 . Built - up roofs 4.3 . Nonbituminous roofing 5. Conclusions 6. References 9 9 66 Hail Resistance of Roofing Products Sidney H. Greenfeld A test.
... at roofing 3.2 . Evaluating failure 4. Results 4.1 . Asphalt shingles 4.2 . Built - up roofs 4.3 . Nonbituminous roofing 5. Conclusions 6. References 9 9 66 Hail Resistance of Roofing Products Sidney H. Greenfeld A test.
Page 1
... shingles tend to be more hail - resistant than Type 235 shingles . ( e ) Weathering tends to lower the hail resistance of asphalt shingles . ( f ) Built - up roofs on dense substrates tend to resist hail better than those on soft ...
... shingles tend to be more hail - resistant than Type 235 shingles . ( e ) Weathering tends to lower the hail resistance of asphalt shingles . ( f ) Built - up roofs on dense substrates tend to resist hail better than those on soft ...
Page 4
... shingle specimens were applied with four staples ( per strip ) to 1 ft 6 in x 3 ft 0 in ( 46 x spheres without shattering . While the struc- ture of these synthetic hailstones is different from that of naturally formed hailstones , it ...
... shingle specimens were applied with four staples ( per strip ) to 1 ft 6 in x 3 ft 0 in ( 46 x spheres without shattering . While the struc- ture of these synthetic hailstones is different from that of naturally formed hailstones , it ...
Page 5
... shingles. The ice spheres were stored in a chest - type freezer at about 10 ° F ( -12 ° C ) until ready for use . 91 ... shingle material will be called failure in this report . For each material and roofing system , the thresholds of ...
... shingles. The ice spheres were stored in a chest - type freezer at about 10 ° F ( -12 ° C ) until ready for use . 91 ... shingle material will be called failure in this report . For each material and roofing system , the thresholds of ...
Page 6
... Shingles When applied according to the recommenda- tions of their manufacturers , Type 235 square- tab shingles have three regions of different vulnerability : ( 1 ) The tab edges , ( 2 ) The sur- face over the unsupported areas between ...
... Shingles When applied according to the recommenda- tions of their manufacturers , Type 235 square- tab shingles have three regions of different vulnerability : ( 1 ) The tab edges , ( 2 ) The sur- face over the unsupported areas between ...
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