Before calling a pro, Aurora homeowners can safely check for common chimney issues like blockages or visible cracks. But know the warning signs that mean it’s time to stop DIY and call a licensed sweep—safety and code compliance depend on it.
Step 1: Check for Obvious Blockages Inside the Firebox
Start by looking into your fireplace’s firebox with a flashlight. Remove any loose debris like leaves, pinecones, or old ashes using a fireplace shovel and dustpan. If you see a thick layer of soot or a dark, tarry substance on the walls or damper, that’s creosote buildup—common in older Aurora homes with masonry chimneys. Do not scrape or disturb it yourself; it’s flammable and toxic. Instead, schedule a professional cleaning after clearing loose debris. If your damper is rusted shut or cracked, avoid forcing it—this is a job for a pro to inspect and repair safely. Learn more about our full list of services.
Step 2: Inspect the Chimney Crown and Exterior Masonry
Walk outside and look up at your chimney crown—the concrete or metal cap at the top. Cracks or missing chunks are red flags, especially after Aurora’s freeze-thaw cycles. Use binoculars if needed. Also check the bricks and mortar joints for crumbling, loose bricks, or white efflorescence (salt stains), which signal water damage. If you spot any of these, don’t climb on the roof yourself—older masonry can be unstable. Instead, take photos and call a pro to assess structural integrity and recommend repairs. See request a free estimate / contact us.
Step 3: Test the Flue and Draft Before Your Next Fire
Before lighting another fire, perform a simple draft test. Light a small piece of newspaper, hold it near the open damper, and watch the smoke. If it blows back into the room or barely rises, your chimney may not be drafting properly. This could mean a blockage, a damaged liner, or even a negative pressure issue in your Aurora home. Never ignore poor draft—it can force carbon monoxide into your living space. Instead, open a window slightly to improve airflow and call a sweep to diagnose the cause. Explore about our team and credentials.
Step 4: Look for Water Stains and Musty Smells Indoors
Inside your home, check the walls and ceiling near the chimney for water stains or peeling paint—classic signs of a leaky chimney in Aurora’s humid summers and snowy winters. Also sniff for a musty or sour odor near the fireplace, which often means moisture is seeping into the masonry or flue. While you can wipe down minor stains with a dry cloth, persistent leaks require professional sealing and flashing repair. Ignoring water intrusion can lead to mold, rot, and costly structural damage over time.
Step 5: Never DIY These 5 Chimney Problems
Some chimney issues are never safe for DIY. Never attempt to clean creosote yourself—it’s highly flammable and toxic. Avoid repairing cracked flue liners or installing a new liner without a professional inspection. Don’t seal cracks in the chimney crown with caulk or mortar unless you’re trained—improper repairs can trap moisture and worsen damage. Also, never climb onto a steep or damaged roof to inspect the chimney. These jobs require specialized tools, insurance, and permits. Attempting them risks injury, fire, or voiding your homeowner’s insurance.
Warning Signs: Stop DIY and Call a Professional Now
If you notice any of these warning signs, stop all DIY attempts immediately and call a licensed chimney sweep in Aurora. These include: visible cracks in the flue liner during a fireplace inspection, a strong chemical or burning odor coming from the fireplace, smoke spilling into the room when the damper is open, or animals or nests in the chimney. Also, if your chimney hasn’t been cleaned or inspected in over a year, or if you’ve experienced a chimney fire (even a small one), professional intervention is urgent. These signs indicate serious hazards like carbon monoxide risk, structural failure, or fire danger.
When to Call Oscar Castillo Chimney LLC
If your Aurora chimney shows signs of wear, poor draft, or water damage, it’s time to call the experts. Oscar Castillo Chimney LLC specializes in masonry inspections, liner repairs, and full system diagnostics for older homes in Aurora and nearby areas like Centennial and Lone Tree. We offer free estimates and prioritize safety and code compliance. Whether you need a routine cleaning, a cracked crown repaired, or a full masonry inspection after a storm, our team has the tools and experience to protect your home. Don’t wait until a small issue becomes a costly emergency—contact us today to schedule your inspection.
Frequently Asked Questions
Why does my Aurora chimney smell like mildew after summer storms?
After heavy summer storms, moisture can seep into older masonry chimneys, creating ideal conditions for mold and mildew growth. This often results in a musty odor near the fireplace. While you can improve airflow, persistent smells require professional waterproofing and sealing. Ignoring it can lead to structural damage and poor indoor air quality.
What does it mean if my Aurora chimney flue liner has cracks?
Cracks in a clay or metal flue liner are serious—they allow heat and gases to escape into your home’s walls or attic, creating a fire hazard and carbon monoxide risk. Older Aurora homes with original liners often develop cracks due to age and thermal stress. Never ignore this; call a pro to assess whether the liner needs repair or replacement immediately.
Can I use a chimney cap I bought at a hardware store to stop birds in Aurora?
A basic chimney cap from a hardware store may stop birds temporarily, but if it’s not sized correctly or installed properly, it can create new problems like poor draft or blockages. In Aurora, where weather can be unpredictable, a poorly fitted cap can also blow off or allow water entry. For a secure, long-term solution, have a professional install a custom cap that meets local codes and protects against both animals and moisture.