Chimney Sweep in Hickory Hills, IL

That's the most common call we get in Hickory Hills, and it's usually not a dirty flue alone. In a split-level or raised ranch, the fireplace sits on the lower level, so the chimney has a long run through the interior of the house before it clears the roof. The flue starts out cold and the column of air in it is heavy, so it wants to sit still or even flow downward. Add a sealed furnace, a bath fan, or a kitchen hood pulling air out of a tight house, and the fireplace becomes the easiest place for makeup air to come in. That means it comes in down the chimney. We check for creosote and blockage first, then look at how the flue is sized against the opening and whether the house is out-competing the chimney for air. Warming the flue before lighting and cracking a window nearby often tells us a lot on the spot.

With the oak canopy over most roofs here, especially on the lots backing toward the forest preserve, it's normal and it does matter. Debris collects in the cap screen and mats on top of chase covers, where it holds water against metal and speeds up rust. If enough packs into the cap, draft suffers before you ever see smoke. On an uncapped flue it's worse, because the same opening that takes leaves also takes nesting. We clear the cap and the smoke shelf as part of a sweep and check whether the chase cover is holding standing water or organic mulch.