Use twenty-six to twenty-four gauge metal for standard painted flashings and twenty-two gauge where heavy duty or coastal exposure demands greater stiffness.

For durable painted metal flashings choose gauge based on span and exposure rather than aesthetics alone. Measure the unsupported span first and when it exceeds about four inches use a heavier gauge to prevent oil canning. Always hem raw edges to add a one-quarter inch stiffening lip and reduce cut-edge corrosion; a simple roll over of the edge with tin snips and a hammer shrinker will do this without special machinery. Select a corrosion-resistant substrate that matches the environment, for example galvanized steel for general use, stainless steel for severe marine exposure, and aluminum where compatibility with adjacent materials and light weight matter. When painting, clean and prime the metal with a metal-compatible primer and apply paint in thin coats to avoid runs that trap moisture under the film. Finally fasten with neoprene-backed fasteners and allow for thermal movement by using slotted holes or short face screws set with butyl or closed-cell foam backup to maintain a weathertight seat.

Common mistakes start with picking a gauge that is too light which leads to oil canning and deformation; using a heavier gauge appropriate to span and exposure fixes this. Another frequent issue is leaving unfinished cut edges that corrode under paint; hem the edges and treat cut edges with a zinc rich or compatible edge primer to stop corrosion. A third problem is rigid fastening that does not allow thermal expansion and contraction and causes fastener pop or paint cracking; instead use slotted holes, neoprene washers and leave small movement gaps wherever the flashing butts against rigid substrates.

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