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Step-by-step guideA season-by-season chimney maintenance guide
What to do for your chimney in each season of an Illinois year — so it’s clean, sealed, and safe by the time you light the first fire. We’ll flag which steps you can do yourself and which are a job for a sweep.
The short version: inspect and sweep in late summer or early fall before burning season, seal and repair masonry in the warm months, burn clean through the winter, and check for water damage in spring. Here’s the full year, step by step.
Check for winter water damage
After a season of freeze-thaw, look (from the ground) for white staining on the brick, flaking masonry, or stains on the ceiling near the chimney. These point to water getting in. Spring is the time to book any masonry repair — mortar and sealants cure best in mild, dry weather. This is a pro job on the roof.
Clear out anything that moved in
Spring is nesting season. If you hear scratching or chirping, or see debris in the firebox, animals have likely gotten in. Have the flue cleared and a screened cap installed so it doesn’t happen again.
Waterproof and seal
With repairs done, summer is ideal for waterproofing — a breathable sealant that keeps rain out of the masonry before next winter’s freeze-thaw. Dry, warm weather gives it the best cure.
Season your firewood
A DIY step with a big payoff: split your wood now and store it off the ground, covered on top, for at least six months. Dry wood (under about 20% moisture) burns hotter and leaves far less creosote than green wood.
Book your annual inspection and sweep
This is the single most important step. Schedule a professional inspection before the first cold night; have the flue swept if creosote has reached about an eighth of an inch. Fall is our busiest season, so book early.
Test your alarms and clean the dryer vent
Test every smoke and carbon-monoxide alarm and replace batteries — a quick DIY job. While you’re at it, have the dryer vent cleaned; lint fires peak in the colder months, and many homeowners bundle it with the chimney visit.
Burn clean and watch the damper
Open the damper fully before lighting, burn only seasoned wood, and never overload the firebox. If you feel a draft with the damper closed, it’s worn and losing heat. Let ashes cool and keep the hearth clear of anything flammable.
Know the warning signs
A tarry smell, smoke pushing back into the room, or a loud roaring sound while burning all mean stop and call. Our warning-signs guide explains what each one means and how urgent it is.
Maintenance questions
What’s the single most important maintenance step?
An annual professional inspection before burning season. It tells you whether you need a sweep, a repair, or nothing at all — and it catches small problems while they’re still cheap to fix. Everything else supports that one habit.
What can I safely do myself?
Season your firewood, test smoke and CO alarms, keep the hearth clear, open the damper fully before lighting, and watch for warning signs. Anything on the roof — masonry, caps, crowns, flashing — or inside the flue is best left to a sweep for safety.
When should I schedule my chimney service?
Late summer or early fall is ideal, before the first cold night. It’s also our busiest stretch, so booking a few weeks ahead gets you a better choice of dates and a clean, inspected chimney in time for the season.
Why handle masonry work in warm weather?
Mortar, crown repairs, and waterproofing sealants cure best in mild, dry conditions, so spring through fall is ideal in our climate. It also means the masonry is protected and dry before the winter freeze-thaw cycles begin.
Start with the annual inspection
Call United Chimney Sweepers to get on the fall schedule — open seven days a week, 7:00 AM to 9:30 PM.
Call (630) 604-3104Bonded & insured • We work to the NFPA 211 standard