While there is no direct functional substitute that matches the specific water-shedding and structural protection provided by an L-shaped metal drip edge, makeshift or historical alternatives include specialized waterproof membrane flashings, extended self-adhering ice and water shield wraps, or custom-bent sheet metal. However, omitting a proper metal drip edge altogether is strongly discouraged by modern building codes because alternative materials lack the rigidity required to prevent water curling and edge rotting.
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