Decide between cerfractory resurfacing/joint repair and full relining for a damaged clay tile flue

Steps

1. Inspect and video-scan the clay tile flue to characterize the damage as either isolated mortar-joint deterioration, widespread surface cracking/gapping, or structurally failed/collapsing tiles
2. For isolated joint deterioration with sound tiles, consider a joint-repair or resurfacing approach using a cerfractory-type sealant product per that manufacturer's current installation and warranty documentation
3. For widespread surface deterioration where tiles are still structurally present but degraded, consider full resurfacing of the flue interior with a cerfractory system per the manufacturer's specified installation method
4. For structurally failed, collapsed, or significantly misaligned tiles, do not rely on a surface-repair product — recommend a full reline (stainless UL 1777-listed liner or cast-in-place system) instead
5. Verify the chosen resurfacing/repair product's current temperature rating, warranty terms, and code-compliance documentation directly from the manufacturer before quoting, since these are proprietary systems and marketing claims vary by brand
6. Video-scan the finished repair to confirm a smooth, continuous, properly sized flue surface