Chimney Repair & Masonry in Mokena, IL

A masonry chimney takes more abuse than almost any other part of your house. It stands fully exposed to rain, snow, and freeze-thaw cycles all year, and every winter the water that soaks into cracked mortar or a damaged crown freezes, expands, and pries the brick apart a little more. Left alone, a hairline crack becomes a leak, a leak becomes spalling brick, and spalling brick becomes a leaning chimney that costs thousands to rebuild. Catching and fixing the damage early is dramatically cheaper than waiting.

Global Chimney Sweep repairs chimneys across Mokena and the south suburbs, from small mortar and crown fixes to firebox and structural work. We start with an honest look at what is actually failing, show you photos, and quote the repair up front. You will never get pressured into a full rebuild when a targeted repair will do — but if the structure is genuinely unsafe, we will tell you that too.

Warning Signs You Should Not Ignore

Call for a repair quote if you see white, chalky staining (efflorescence) on the brick, which means water is moving through the masonry; mortar joints that are recessed, cracked, or missing chunks; pieces of brick or concrete on the roof or in the yard; a damper or firebox that has rusted; water stains on the ceiling or wall near the chimney; or daylight visible through gaps at the top. Any of these is a sign that water is getting where it should not, and water is what destroys chimneys. The sooner it is sealed out, the less you will spend.

Chimney Flashing Repair: Stopping Leaks Where the Chimney Meets the Roof

If you have a water stain on the ceiling or wall near your chimney, failed flashing is the most likely culprit. Flashing is the layered metal seal at the joint where the chimney passes through the roof, and it is one of the hardest-working — and most failure-prone — parts of the entire system. Unlike a cracked crown or worn mortar up top, a flashing leak drips straight into your living space, so it usually gets noticed fast.

Proper chimney flashing is actually two overlapping layers working together. Step flashing is tucked under the roof shingles and bent up against the chimney, and counter flashing is set into a groove cut in the mortar joints and folded down over the step flashing, so water can never find an open seam to follow. When the sealant dries out and shrinks, when the counter flashing works loose from the mortar, or when the metal corrodes or was installed poorly in the first place, that watertight overlap breaks down and rain gets in.

Because flashing sits at the intersection of two trades — roofing and masonry — it is often rushed or skipped by crews who specialize in only one. We treat it as the critical waterproofing detail it is, so the repair actually holds up through Chicago-area freeze-thaw seasons instead of leaking again next spring.

Frequently Asked Questions