Calculate the total linear feet of roof flashing needed for walls, edges, and penetrations. Flashing prevents water intrusion at roof transitions.
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Total length where roof meets a wall.
Length of roof edges requiring flashing.
Number of pipes, vents, or other penetrations (adds ~4 ft each).
How this calculator works
Total flashing length equals wall abutment length plus roof edge length plus four times the number of penetrations (each penetration requires flashing all around).
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