Decide when a cast-in-place liner system is the appropriate relining method instead of a stainless liner

Steps

1. Inspect the existing masonry flue (Level II, with video scan) to assess whether the structural masonry itself is deteriorated versus just the flue lining material
2. Consider cast-in-place lining when the goal is to also structurally reinforce a cracked or deteriorated masonry chimney, since the cast/poured lightweight refractory material bonds to and can strengthen the surrounding masonry, unlike a stainless sleeve
3. Consider a stainless UL 1777-listed liner instead when the masonry structure itself is sound and only an interior lining/sizing correction is needed
4. Confirm the specific cast-in-place product's listing/testing documentation and installation instructions from its manufacturer, since these systems are proprietary and not covered by a single liner listing the way stainless liners are under UL 1777
5. Install per the manufacturer's mandrel/forming and mixing procedure and the requirements of NFPA 211 and locally adopted mechanical code
6. Video-scan the completed liner to confirm a smooth, unobstructed, continuous flue surface before closing out the job