When installing a metal roof drip edge, adjacent sections should never overlap tightly without a small expansion gap, nor should they leave a wide gap that exposes the roof deck. Installers typically overlap adjoining pieces by about two inches to allow for thermal expansion and contraction caused by temperature fluctuations. Leaving a tiny expansion allowance prevents the metal from buckling or warping under extreme heat, while ensuring that water never finds an opening to seep through to the wood beneath.
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