Where to start with chimneys? Probably here: A chimney is not just an elongated window, not just a portal from inside to outside with deep, brick sills. A chimney, in fact, is a machine for generating ...

Dear James: After using my wood-burning fireplace often this winter, I have found some long cracks in the brick and mortar outdoors. Is this something that needs immediate attention? -- MaryAnn L.

Your chimney looks fine from the yard — but inspectors know better.

For residents of the Front Range and the surrounding Colorado mountains, winter is more than just a season; it is a test of residential infrastructure.