The cap is the small part at the very top of the chimney that does an outsized job, and a chimney missing one, or wearing a rusted-out cap that no longer seals, is an open invitation for everything a Chicago year throws at it. EmberShield Chimney Pros installs and replaces chimney caps across Chicago, IL, sized to your actual flue, built to take lake-effect wind and a Cook winter, and fitted with the spark screen and mesh that keep embers in and animals out. We treat the cap as a working part of the chimney system, because in a climate of heavy snow, driving rain, and curious wildlife that is exactly what it is.
- Cap sized to the actual flue, not a guess
- Stainless or other weather-rated material built to last
- Spark screen and animal mesh fitted
- Multi-flue caps for shared stacks where needed
- Secured against lake-effect wind and winter load
- Free assessment and a straight written estimate
The quiet damage an open or failed flue invites
An uncapped flue is an open pipe pointed at the Chicago sky, and everything that falls out of that sky goes straight down it. Rain and snowmelt pour directly onto the smoke shelf and the damper, rusting the metal and soaking the masonry from the inside, where it accelerates exactly the deterioration the rest of the chimney is already fighting. Over a few winters that water cracks liner tiles, corrodes the damper so it no longer seals, and feeds the freeze-and-thaw damage that crumbles the masonry from within. A cap is a small piece of metal, and the absence of one is one of the most common reasons a sound-looking chimney is quietly falling apart on the inside.
Water is not the only thing an open flue lets in. Birds, squirrels, raccoons, and other animals treat an uncapped chimney as a ready-made nesting cavity, and a nest packed into the flue is both a draft blockage and a fire hazard, on top of the obvious problem of an animal trapped in your chimney. Downdrafts are another headache an open or poorly fitted flue invites, pushing cold air and sometimes smoke back down into the house. A good cap shuts down all of it at once, which is why it is one of the highest-value, lowest-cost pieces of a chimney to get right.
Fitting a cap that actually fits the chimney
A cap only does its job if it is sized and secured correctly, and a generic cap jammed onto the wrong flue is barely better than no cap at all. We measure the actual flue and the chimney top, then fit a cap matched to it, in stainless or another weather-rated material chosen to last rather than to rust out in a few Chicago winters. On the many older homes here with more than one flue sharing a single stack, a furnace flue and a fireplace flue side by side, we fit a multi-flue cap built to cover the whole top properly rather than leaving one flue exposed. The spark screen keeps embers from landing on the roof, and the mesh keeps animals out, and both are sized so they do not choke the draft.
Securing the cap matters as much as choosing it, because Chicago wind, and the lake-effect gusts that come with it, will work a poorly anchored cap loose over a winter. We fasten the cap so it stays put through the wind and the snow load, and we make sure it sits high enough and clear enough that it improves the draft rather than restricting it. A cap done right is one you install once and stop thinking about, which is the whole idea. We will assess your chimney top, tell you honestly whether your existing cap can be re-secured or genuinely needs replacing, and put the price in writing either way.
A small upgrade that protects the whole stack
Of all the work a chimney can need, a cap is among the best returns, precisely because it heads off the slow, expensive damage that an open flue causes out of sight. A cap almost always costs a fraction of the liner repair, masonry work, and animal removal it prevents, and on a Chicago chimney it also shuts down the downdrafts and the water intrusion that make a fireplace unpleasant or unsafe to use. A good cap is quiet insurance for everything below it, the liner, the damper, the smoke chamber, and the masonry.
We will look at your chimney top at no charge and tell you exactly what it needs, whether that is a new single cap, a multi-flue cap for a shared stack, or simply re-securing a sound cap that has worked loose, with an honest estimate in writing. If your flue is open to the sky, your existing cap is rusted through, or you are hearing wildlife or fighting downdrafts, the fix is usually simple and it is one of the easiest ways to add years to the life of the entire chimney.
One stack, every part of it accounted for
A chimney is a system, so chimney cap installation rarely stands alone, it connects to fireplace sweep, pre-season chimney inspection, flashing repair, chimney relining, chimney masonry repair, and our crew handles all of it under one roof. We bring the same service to Chimney Cap Installation in Evanston, Chimney Cap Installation in Oak Park, Cicero chimney cap installation, Berwyn chimney cap installation and everywhere else across the Chicago area.
If you searched for a local chimney crew near you, you have reached a local crew, call 447-212-2241 any time. For background, read Hiring a Chicago Chimney Company: How to Spot the Honest Ones on our blog, or head back to our Chicago home page to see everything we do.