Cap installation
A damaged cap is replaced to keep rain out of the inside of the chimney.
Masonry Repair
Chimney Waterproofing Clarendon Hills, IL
A Clarendon Hills chimney technician can apply a siloxane-based water repellent to chimney masonry, to slow freeze-thaw damage and spalling. Call (331) 301-3221 to reach a local chimney sweep.
Masonry acts like a hard sponge, absorbing rain through the brick faces and the mortar joints. That water freezes in cold weather, breaking brick faces off and loosening mortar, and it also carries salts to the surface as white efflorescence. The goal of waterproofing is to keep that rain on the surface so it runs off.
The product matters more than anything else. Breathable repellents work below the surface: rain beads off, but vapor from inside can still escape. Non-breathable coatings hold water in the masonry and cause the spalling they were supposed to prevent.
A repellent only helps on sound masonry. Cracks, open mortar joints, a cracked crown, failed flashing and a missing cap all let in far more water than porous brick does, so those are repaired first. Once repairs have cured, the repellent is applied to clean, dry masonry.
Depending on what the sweep finds, chimney waterproofing in Clarendon Hills, IL can go hand in hand with chimney leak repair and chimney tuckpointing.
Dealing with this in Clarendon Hills, IL right now? Call (331) 301-3221 and describe the problem to a chimney sweep who works in Clarendon Hills.
Call nowThe process
How chimney waterproofing works
Waterproofing is only as good as the repairs and prep that come before it.
Assess the masonry
The technician checks the crown, cap, flashing, mortar joints and brick for anything that would let water in. Any existing paint or sealer is noted, since it affects what can be applied.
Fix the masonry
Every water entry point that repellent cannot handle is repaired. The repellent waits until the repairs have cured.
Clean the masonry
The surface is washed and cleared of deposits. Clean masonry absorbs the repellent evenly.
Dry the masonry
The masonry is allowed to dry thoroughly before treatment. A dry forecast on both sides of the job gives the best results.
Treat the masonry
The repellent is sprayed or brushed on evenly, from the top of the chimney down. The crown typically gets a separate flexible crown sealer.
Water test
Once cured, water should bead on the brick instead of soaking in. A breathable repellent leaves no glossy coating on the brick.
What is included
Waterproofing work a chimney sweep handles
Efflorescence cleaning
White efflorescence and dirt are cleaned off before treatment so the repellent can penetrate.
Masonry water repellent
A vapor-permeable repellent is applied to all exposed masonry that keeps rain out and lets vapor escape.
Flashing check
The joint at the roof is inspected and sealed as part of a complete waterproofing job.
Crown coating
A crown coating bridges small cracks so the top of the chimney stays watertight.
Related service
Chimney Sealing Clarendon Hills, IL
Sealing a chimney goes beyond the brick: it covers the crown, flashing, cap and masonry. That includes a flexible coating on the crown, sealed or repaired flashing at the roof, a cap over the flue and a breathable repellent on the brick and mortar. Whatever goes on the brick needs to breathe.
A Clarendon Hills chimney that was sealed with the wrong product can be damaged faster than one left alone. Products that form a film on the surface trap vapor and make spalling worse. If something has already been applied, mention it so the technician can choose a compatible approach.
Local help
Chimney Waterproofing Near Me
In Clarendon Hills, the weather side of a chimney usually shows moisture damage first. Homes in Clarendon Hills and nearby towns like Westmont, Hinsdale, Willowbrook and Oak Brook include many brick chimneys that have soaked up decades of rain, along with some that were painted or coated with the wrong sealer, and treating the chimney before winter gives it the best protection.
For chimney waterproofing in Clarendon Hills, IL or nearby towns like Westmont, Hinsdale, Willowbrook and Oak Brook, call (331) 301-3221 to reach a chimney sweep who covers your street.
What the local climate does to a chimney
Winters here are cold and long, with lake effect snow in many towns and deep cold snaps that can last for days. Furnaces, wood stoves and fireplaces run hard from fall to spring, which means fast creosote buildup and a lot of stress on liners, crowns and flashing. Snow that piles up behind a chimney and melts slowly is a common source of leaks at the flashing. That is why Clarendon Hills chimney sweeps are busiest every September and October.
Why call
Why fix it now
Smaller repairs
Small chimney problems caught early usually stay small repairs.
Sweeps who know Clarendon Hills
Chimney sweeps in Clarendon Hills know the chimneys and fireplaces common in local homes.
Straight answers
Ask your questions before you agree to anything.
Chimney Waterproofing questions
Why would I waterproof my chimney?
A vapor-permeable repellent keeps most rain out of the brick, protecting it from freeze-thaw damage. It protects repaired masonry, but cannot stop water coming through cracks or failed flashing. In wet, freezing climates, it adds real protection.
Will waterproofing fix my leaking chimney?
Waterproofing helps if the brick itself is absorbing water, but most chimney leaks come from somewhere else. The usual leak sources need their own repairs. Repair the source first, then waterproof.
What kind of sealer should be used on chimney brick?
Breathable, penetrating repellents made for masonry are the right choice. These soak into the brick and repel liquid water while letting water vapor escape. Products that form a film on the surface can cause the damage they were meant to prevent.
How long does chimney waterproofing last?
Expect several years of protection, with the exact life depending on product and weather. When rain starts darkening the brick again instead of beading, it is time to reapply. Annual inspections can track how well it is holding up.
Can I paint my chimney to waterproof it?
Painting a chimney to waterproof it usually causes more harm than good. Moisture from inside and from small cracks gets trapped behind the paint film. Use a breathable water repellent instead.
More questions? Call (331) 301-3221
Often needed together
Chimney Leak Repair
Stopping chimney leaks at the source, instead of patching the stain on the ceiling.
Learn moreChimney Tuckpointing
Replacing crumbling mortar between chimney bricks, so rain stops getting in through the joints.
Learn moreChimney Crown Repair
Sealing cracked chimney crowns or rebuilding crumbling ones, so water stops soaking into the masonry from the top.
Learn moreChimney Cap Installation
Installing chimney caps with mesh sides to keep out rain, animals, leaves and stray sparks.
Learn more
Looking for something else?
See all chimney servicesTalk to a Clarendon Hills chimney sweep about chimney waterproofing
Call (331) 301-3221 for a local chimney sweep in Clarendon Hills and nearby towns.
(331) 301-3221
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