In significant wind events, failure frequently begins at the flashing attachment at the roof edge, e.g.  eaves and gables, and at roof plane transitions with a reflex angle, e.g. hips and ridges.  This test method is intended to determine the capacity of these flashings to withstand the anticipated wind loads. 

For direct-fastened faces less than 4 inches (100 mm) it is anticipated that the mode of failure will be fastener pull-out; therefore, testing of faces less than 4 inches (100 mm) is not required. 

Fasteners used to direct-fasten faces less than 4 inches (100 mm) must have adequate pull-out resistance for the design loads. 

For cleated faces less than 2 inches (50 mm) the design loads  will yield a line load that is too low to allow for a significantly meaningful series of test cycles; therefore, testing is not required for flashing with faces less than 2 inches (50 mm).