(1) The transverse dimension of a roofing element or component not overlapped by an adjacent element or component in a roof covering. For example, the exposure of any ply in a built-up roof membrane may be computed by dividing the felt width, minus 2 inches, by the number of shingled plies; thus, the exposure of 36-inch-wide felt in a shingled, four-ply membrane should be approximately 8 1/2 inches; (2) the dimension of sidewall or roof covering that is not covered or overlapped by the upslope course of component. The typical exposure for a standard-size, three-tab shingle is 5 inches. This varies depending on manufacturer specifications.
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