Chimneys as an architectural compliment, however only the good chimneys last and don't leak. I would have to guess on how many chimneys we costructed over the years, well in the hundreds.
The best chimneys are built with quality materials and with many details unseen, even if it’s simple in design. Photo on right
Below are a few attributes to a long lifecycle
Quality Brick - water struck shown here
Quality brand mortar and mix type for material used.
Through width flashing
Flue tile top copping expansion gasket
Fiber reinforced cement coping
Optional - Complimentary hood cover
Details -whether it’s obvious, or unseen
The image below shows a lead absorption pan being installed in a central chimney. This is a well worth added expense for the homeowner, when undergoing new construction.