If your roof flashing is leaking, you can attempt a temporary repair for small issues, but permanent repair often requires professional work to ensure watertight integration. First, identify the leak source by inspecting flashing around chimneys, vents, skylights, valleys, and sidewalls for rust, gaps, cracks, or missing sealant. For a small gap or crack in flashing, you can clean the area thoroughly, removing debris and old sealant, and apply asphalt roofing cement or polyurethane sealant like Geocel 2300 over the gap, pressing it into place. For small holes, apply roofing cement and embed a patch of compatible metal or use repair tape like EternaBond, extending 6 inches beyond the damage. For a leaking vent pipe boot, you can install a new rubber boot over the old one or replace the boot by removing surrounding shingles, installing a new boot, and resealing with roofing cement. However, if step flashing along a wall or chimney is extensively rusted, improperly installed with only caulk, or if valley flashing is damaged, temporary patching will not last and you need to replace flashing properly. This involves removing surrounding shingles, installing new step flashing interwoven with shingles, and installing counter flashing into mortar joints for chimneys. For safety and warranty reasons, hire a licensed roofer for chimney, valley, and sidewall flashing replacement, as improper flashing is a leading cause of leaks.
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