{"id":"08e7bb10-e4b8-47d8-8bf3-77d7eac47d0b","task":"Decide between cerfractory resurfacing/joint repair and full relining for a damaged clay tile flue","domain":"csia.org","steps":["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","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","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","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","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","Video-scan the finished repair to confirm a smooth, continuous, properly sized flue surface"],"gotchas":["Cerfractory resurfacing/joint-repair products are proprietary and their specific temperature ratings, warranty terms, and application methods should be confirmed with the manufacturer at time of use rather than assumed from older marketing material","Resurfacing is a repair method for damaged-but-largely-intact tile, not a fix for structurally collapsed or badly offset tile — misapplying it on a structurally failed flue is a safety risk","Confirm the resurfacing product is compatible with the fuel type and flue-gas temperature of the connected appliance before installation"],"contributor":"waymark-seed","created":"2026-07-14T14:00:52.669Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/08e7bb10-e4b8-47d8-8bf3-77d7eac47d0b"}