Thermal-shock Resistance for Built-up MembranesU.S. Department of Commerce, National Bureau of Standards, 1967 - 13 pages The resistance of bituminous built-up roofing membranes to thermally induced forces is considered in terms of their strength properties such as breaking load in tension, modulus of elongation and apparent linear thermal expansion coefficient.The development of a Thermal-Shock Resistance Factor is described and values are given for three bituminous built-up membranes at temperatures of - 30F (-34.4C), 0F (-17.8C), 30F (-1.1C) and 73F (22.8C).The apparent relation between the values obtained in the laboratory and the observed performance of roofing membranes in service is considered.The utilization of the Thermal-Shock Resistance Factor in the reduction of potential failures of bituminous built-up roofing membranes in service from thermally induced forces is also discussed.(Author). |
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Results 1-5 of 8
Page 4
... membrane , strength properties , thermally induced forces , thermal - shock ... membrane- 1. Introduction es [ 1 , 2 , 3 , 4 ,. 1 Page 1. Introduction_ . shock ... exposure conditions or material and application specifications mended by ...
... membrane , strength properties , thermally induced forces , thermal - shock ... membrane- 1. Introduction es [ 1 , 2 , 3 , 4 ,. 1 Page 1. Introduction_ . shock ... exposure conditions or material and application specifications mended by ...
Page 7
... membranes at 30 ° F Direction & AB AE AB TABLE 5. Properties of bituminous built - up membranes at. 2.7 ° C ) during the test . The temperatures cted were believed to cover a realistic tempera- e range for roofs exposed in many areas of ...
... membranes at 30 ° F Direction & AB AE AB TABLE 5. Properties of bituminous built - up membranes at. 2.7 ° C ) during the test . The temperatures cted were believed to cover a realistic tempera- e range for roofs exposed in many areas of ...
Page 8
... membranes during recent years on roofs exposed to low and changing temperatures have revealed some factors which frequently contribute to such failures . These include , among others , climate , orientation of the felt in the membrane ...
... membranes during recent years on roofs exposed to low and changing temperatures have revealed some factors which frequently contribute to such failures . These include , among others , climate , orientation of the felt in the membrane ...
Page 9
... membrane exposed in an area ex- iencing an average January temperature of ° F than that required for another membrane be exposed where the average January tempera- e is 30 ° F . Similarly , a higher factor will be essary for a membrane ...
... membrane exposed in an area ex- iencing an average January temperature of ° F than that required for another membrane be exposed where the average January tempera- e is 30 ° F . Similarly , a higher factor will be essary for a membrane ...
Page 1
... membranes constructed in the laboratory , isting of 2 , 3 , and 4 plies of felt , respectively . addition values for samples of bituminous -up roofs with up to 25 years exposure in ice are also given . In some cases the roof branes from ...
... membranes constructed in the laboratory , isting of 2 , 3 , and 4 plies of felt , respectively . addition values for samples of bituminous -up roofs with up to 25 years exposure in ice are also given . In some cases the roof branes from ...
Common terms and phrases
adhesive anisotropic Apparent Linear Thermal ASPHALT SATURATED asphalt-sat Average of three bituminous built-up membranes brane Breaking load Building Research Institute Building Science Series built-up roofing membrane Bureau of Standards coal-tar Coal-tar-pitch coal-tar-sat coeffi coefficient of linear deviation among replicates dumbbell-shaped elasticity Elongation modulus F Membrane four-ply built-up initial tangent kg/cm² L-Longitudinal with machine laboratory lb/in see footnote linear thermal expansion Load-Strain Properties mbrane membrane exposed membrane in service membrane placed Modulus of elasticity modulus of elongation National Bureau NBS Mono number of plies obtained Owens-Corning Fiberglas Corporation plies of felt predicting the ability Properties of bituminous reinforcing felt reported roofing felt roofs exposed saturated organic felt service conditions shear strength Shock Resistance Factors side of eq splitting failures standard deviation substrate T-Transverse across machine Temperature Range 30 tension splits test specimen thermal expansion coefficient Thermal-Shock Resistance Factor thermally induced forces three specimens U.S. Navy W. C. Cullen
Popular passages
Page 6 - Rough Surfaces," in Radar Cross Section Handbook, George T. Ruck Ed. (Plenum, New York. 1970) Chap. 9. 7. Certain commercial equipment, instruments, or materials are identified in this paper in order to specify the experimental procedure adequately. Such identification...
Page 5 - Figures in brackets indicate literature references at the end of this paper. 2. Thermally and Mechanically Induced Forces The authors...
Page 9 - Koike [77] and those reported in this paper support the validity of some suggestions made by Cullen [10] regarding the alteration of some conventional application techniques to reduce the incidence of splitting failures resulting from mechanically and thermally induced forces, such as: (a) the placement of the insulation boards with their long dimension parallel to the short dimension of the roof, (b) the orientation of the roofing felt parallel to the long dimension of the roof, and (c) the use...