Chimney Work in Kalispell, Montana

Three Eras of Chimney, One Valley Floor

The pre-war houses around the old grid have brick chimneys built when a masonry stack was the ventilation system - often multi-flue, frequently unlined or lined only partway, and now close to a century into a freeze-thaw climate. Those are the ones where a camera earns its cost almost every time. Mortar joints on the interior face erode long before anything shows outside, and an unlined flue venting a modern appliance is a different risk than the same flue venting the coal stove it was built for.

The mid-century belt is mostly single-flue brick or block serving a furnace, plus a fireplace that in a great many cases was later fitted with a wood-burning insert. That insert is the thing to check. Installed properly it came with a full-height stainless liner. Installed cheaply in 1985 it did not, and the flue is now oversized and unlined for the appliance actually using it.

Newer subdivision housing generally has factory-built fireplaces with class-A pipe, which is the easiest of the three to inspect and the least forgiving of neglect. Thin-wall stainless has almost no thermal mass, so it heats and cools fast, joints work loose, and a real chimney fire warps the liner beyond repair rather than cracking something repairable. Different construction, different failure mode, same annual look.