Standard Test Method for Water Penetration of Exterior Metal Roof Panel Systems by Uniform Static Air Pressure Difference

Importancia y uso:

5.1 This test method is a standard procedure for determining the resistance to water penetration under uniform positive static air pressure differences, and simulates wind driven rain imposed on sidelaps and rain that is free to drain while building a water head as it flows. The slope of the roof is significant. These factors shall be fully considered prior to specifying the test pressure difference.

Note 1: In applying the results of tests by this method, note that the performance of a roof or its components, or both, may be a function of proper installation and adjustment. 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. Some designs are more sensitive than others to this upward moving water.

Note 2: This is a test procedure. It is the responsibility of the specifying agency to determine the specimen construction, size, and test pressures after considering the method’s guidelines. Practical considerations suggest that every combination of panel thickness, span, and design load need not be tested in order to substantiate product performance.

Note 3: This test method shall not, by itself, be relied upon to form conclusions about overall water penetration through metal roofs. A roof contains many details. Although prescribed modifications are outside the scope of this test method, an experienced testing engineer is able to use the principles presented in this test method and generate significant data by isolating specific details and measuring leakage.

Subcomité:

E06.57

Referida por:

E1514-98R23E01, E1680-16R22, E2140-01R23, E1637-98R17E01

Volúmen:

04.11

Número ICS:

91.060.20 (Roofs)

Palabras clave:

air; air pressure; leakage; mastic; metal; panel; ponding; pressure; rain; roof; roof panel; side lap; side seam; static; structural; thermal expansion; water; water leakage; water penetration; water-spray ;