Net Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. In applying the results of tests by this method, f that the performance of a roof or its components, or both, may be a function of proper installation and adjustment. This process is repeated for a total of three cycles. Ast, is a essential part of the testing procedure. The slope of the roof is significant. This test method shall not, by itself, be relied upon to form conclusions about overall water penetration through metal roofs.
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The purpose of this test method is to conduct quality assurance water penetration testing of the roof including panel side laps and structural connections. For that reason the slope of the roof plays a significant importance. The test is conducted by attaching the chamber to the test specimen. A section of calibrated spray racks are set in place 12 inches above the specimen. The calibrated spray racks shall deliver water uniformly against the roof surface at a minimum rate of five gallons per square foot per hour.
Pre-loading is a essential part of the testing procedure. The preload test pressure differences positive and negative are to be specified. The positive test pressure shall be greater than or equal to 15 pounds per square foot. Prior to testing a positive static air pressure differential preload is applied. Then the specimen is preloaded with a negative static air pressure differential for a minimum of 10 seconds.
After applying the preload there is a two minute recovery period. This process is repeated for a total of three cycles. SITC has utilized this test method to assist our clients with their quality assurance testing of metal panel roof systems.
More E The slope of the roof is significant. These factors shall be fully considered prior to specifying the test pressure difference. In service, the performance also depends on the rigidity of supporting construction, roof slope, and on the resistance of components to deterioration by various causes: corrosive atmosphere, aging, ice, vibration, thermal expansion and contraction, etc. It is difficult to simulate the identical complex wetting conditions that can be encountered in service, including large wind-blown water drops, increasing water drop impact pressures with increasing wind velocity, and lateral or upward moving air and water.
ASTM E1646 - 95(2018)
ASTM E1646 PDF