| Download | - View final version: Investigating the cause of blistering in SBS polymer modified-bitumen roofing membranes (PDF, 1.9 MiB)
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| DOI | Resolve DOI: https://doi.org/10.4224/20331503 |
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| Author | Search for: National Roofing Contractors Association (USA); Search for: National Research Council of Canada |
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| Format | Text, Technical Report |
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| Physical description | 39 p. |
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| Subject | Roofs; Roofs |
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| Abstract | The cause of blistering in modified bituminous roofing membrane systems was investigated. Membrane samples were removed from several existing modified bituminous roofs containing blisters. Their mechanical behaviour was characterized by tensile tests. Gas content within the blisters were collected in canisters in the field and their chemical composition was determined quantitatively by Gas Chromatography /Mass Spectroscopy (GC/MS). Mechanical testing indicates that blister formation does not seem to depend onthe strength of the modified bituminous membrane. Also, the existence of blisters did not reduce the strength of the membrane, at least not where the blister remained intact. GC/MS revealed that the gas within the blisters was composed mainly of air and water vapour, with a negligible amount of volatile organic compounds. The relative humidity of the blister gas ranged from 30 to 75%. These findings indicated that the mechanism of blister formation and growth in modified bituminous roofs is possibly the same as that inbuilt-up roofing where water vapour promotes blister growth by exerting cyclic pumping action to the blister following the diurnal changes in temperature. |
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| Publication date | 1998-03-01 |
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| Publisher | National Research Council of Canada |
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| Series | |
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| Language | English |
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| Peer reviewed | No |
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| NRC number | NRC-IRC-8199 |
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| NPARC number | 20331503 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 770bed80-ec9d-46e1-8823-78a001cde2fb |
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| Record created | 2012-07-18 |
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| Record modified | 2022-11-07 |
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