The new flexible stainless liner goes down the first brick chimney one arm length at a time. There is no dramatic tooling in a reline, just patient hands keeping a continuous steel run straight as it travels the full height of the flue, past the offsets old chimneys hide inside.
What is happening in this clip
One technician feeds the liner from the ridge while gravity does the pulling. The liner is a single continuous piece, so the work is about pace and alignment: rush it and it kinks, and a kinked liner chokes the draft it was installed to fix.
Why continuous beats sectioned
A one-piece liner has no joints inside the chimney, which means no seams to loosen with heat cycles and nothing to leak. Whatever the flue does over the next few decades, the steel path inside it stays sealed end to end.
Sized for altitude
Draft at 5,430 feet has less margin than the sea level charts assume, so the liner diameter is chosen for the air Boulder actually has. The right size drafts eagerly from the first fire; the wrong size sulks forever.
