Damage & Failure
What is Flashing Failure?
Roofing Glossary · Damage & Failure
Definition
The deterioration, displacement, or improper sealing of metal flashing that allows water to infiltrate at roof transitions, penetrations, or vertical surfaces. Flashing failures are the single most common cause of active roof leaks in otherwise serviceable roofs. Common causes include improper installation, galvanic corrosion between dissimilar metals, thermal expansion cracking of sealant, and ice dam displacement. Flashing can often be repaired without replacing the entire roof.
Related Roofing Terms
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FlashingThin strips of impervious metal — typically galvanized steel, aluminum, or lead — installed at joint...
→Step FlashingIndividual rectangular pieces of metal flashing installed in an alternating staircase pattern at the...
→Counter FlashingMetal flashing embedded in the mortar joints or surface of a chimney or wall that overlaps the step ...
→Valley FlashingA sheet metal or membrane lining installed in the valley of a roof to create a watertight channel fo...
→Pipe BootA prefabricated rubber or metal flashing collar that seals around plumbing vent pipes where they pen...
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