Chimney flashing problems: repair or replacement?
Chimney flashing can be repaired when failure is isolated and the surrounding roofing and masonry are sound. Replacement is stronger when step flashing is missing, counterflashing is poorly embedded or several layers have been patched repeatedly. The decision should also account for previous patch layers.
Separate chimney and roof leaks
Cracked caps, mortar and porous masonry can admit water above the flashing. Both systems need inspection.
Layered flashing is the durable method
Step flashing should integrate with each roofing course and counterflashing should protect its upper edge.
Sealant has a limited role
Compatible sealant can maintain specific joints, but a thick exposed bead cannot replace missing metal layers.
Details worth checking
- Uphill head flashing
- Sidewall step flashing
- Counterflashing
- Mortar and chimney cap
- Deck condition
- Previous patch layers
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Chimney flashing repair
Chimney flashing repair focuses on rebuilding the roof-to-masonry transition, including step flashing along sidewalls.B.C. roofing advice
Roofing advice is most useful when it gives a direct answer, explains the conditions that change it and points to a practical next step.Roof repair or replacement: how to decide
Choose repair when the defect is isolated and the surrounding roof remains serviceable.Apply the information to the actual roof
Share the property, roof type, observed condition and decision timeline. A site-specific review can confirm which parts of the guidance fit and where the scope needs to change. The decision should also account for uphill head flashing.
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