Roof Flashing Calculator

Step, Wall & Chimney Flashing Estimator

The Flashing Calculator returns the linear feet and piece count of step flashing, continuous wall flashing, and chimney flashing needed to weatherproof every transition on your roof. Step flashing pieces are typically 5x7 or 4x10 inches and overlap each shingle course at sidewalls. Enter the linear feet for each flashing type and the tool returns counts with proper overlap. Combine with our Valleys and Drip Edge calculators for full edge-and-flashing coverage.