Upgrading your Longmont chimney starts with a clear inspection and knowing what’s safe to tackle yourself. Learn the basics, spot red flags early, and decide when professional help is worth it—before you climb on the roof.
Start with a simple Longmont chimney check you can do from the ground
Before scheduling any work, walk around your Longmont home and look up at the chimney from the yard. Check for leaning bricks, missing mortar, or cracks wider than a credit card. If you see any of these, stop and call a pro. Next, inspect the chimney cap from the ground—if it’s missing or damaged, critters and rain can get in. You can also shine a flashlight up the flue from the fireplace opening to spot large obstructions or heavy creosote buildup. If the flue feels rough or has dark, tarry stains, that’s a sign you need a professional sweep. These quick checks take 10 minutes and can save you from costly surprises later.
Cleaning your Longmont chimney: what’s safe to DIY and what’s not
If your chimney hasn’t been cleaned in over a year and you burn seasoned hardwood, a basic chimney brush and gloves can handle light creosote buildup on the lower flue. Use a 8-inch brush for most Longmont homes and work from the fireplace up. Never use a power drill attachment—it can damage the flue liner. After brushing, vacuum the fireplace and check the smoke chamber for debris. But if you see thick, shiny creosote (Stage 2 or 3), or your chimney is over 8 feet tall, stop and call a pro. Creosote fires are real, and improper cleaning can void warranties or damage your liner. For a full guide, see our Longmont chimney cleaning tips.
Warning signs your Longmont chimney needs a pro—now
Stop all DIY work immediately if you notice smoke backing up into the room, a strong chemical odor in the fireplace, or white residue on the flue tiles. These point to a blocked flue, cracked liner, or dangerous creosote glaze. Also, if your chimney leans more than an inch or has crumbling bricks near the roofline, it’s a structural red flag. Longmont’s freeze-thaw cycles can worsen small cracks over winter, so don’t wait. Another clue: if your fireplace takes longer to start drafting or you hear a whistling sound when it’s lit, call a pro. Ignoring these signs risks carbon monoxide leaks or chimney fires. For more details, read our Level 1 chimney inspection guide.
What Longmont homeowners should never DIY—and why
Never attempt to reline a chimney, replace a flue tile, or repair a cracked chimney crown yourself. These jobs require specialized tools, permits, and knowledge of local Longmont building codes. DIY crown repairs using mortar can trap moisture and cause bigger cracks later. Also, don’t seal cracks with silicone or paint—this hides problems and can lead to dangerous flue gas leaks. Installing a new chimney cap or replacing flashing is doable if you’re comfortable on a ladder, but if the roof is steep or wet, call a pro. Even simple tasks like tuckpointing mortar joints need the right mix and technique to last in Longmont’s climate. For a full list of services we handle safely, visit our services page.
When to call Michael Johnson Chimney Inc for your Longmont upgrade
If your chimney shows signs of damage, hasn’t been inspected in over a year, or you’re unsure about any step, it’s time to call us. We offer free estimates and can spot issues before they become emergencies. Our team handles everything from crown repairs and liner replacements to full relining and cap installations—all with Longmont’s climate in mind. We also provide Level 1, 2, and 3 inspections to meet local codes. Whether your home is in central Longmont or nearby Niwot, Erie, or Boulder, we’re licensed and insured. Don’t risk climbing on a damaged roof—contact us today for a safer, smarter upgrade.
Longmont’s climate means your chimney needs extra attention
Longmont’s high elevation and temperature swings put extra stress on chimneys. Moisture from rain and snow can seep into cracks, freeze, and expand, causing bricks to spall. Salt from winter de-icing can corrode mortar joints over time. If your chimney is older than 15 years, consider a video inspection to check the liner condition. Also, inspect the chimney cap annually—Longmont’s wind can blow debris into uncapped flues. For seasonal tips, see our July chimney checklist. Protect your investment by addressing small issues early, before they become big repairs.
Frequently Asked Questions
My chimney in Longmont smells like campfire even when it’s not in use. Why is that and what should I do?
That odor usually means creosote buildup or moisture trapped in the flue. Longmont’s humidity and seasonal burning can worsen this. Start by airing out the room and checking for dampness in the smoke chamber. If the smell persists after a few days, it’s time for a professional cleaning. Don’t mask the odor with air fresheners—it’s a sign your chimney needs attention.
Why does my Longmont fireplace smoke back into the room when I light a fire? Is this a DIY fix?
Smoke backflow often points to a blocked flue, poor drafting, or a damaged chimney cap. Longmont’s wind patterns can also push smoke back down. Check the damper is fully open and the flue isn’t obstructed by debris. If the problem continues, it’s likely a structural or drafting issue that requires a Level 2 inspection. Don’t keep trying to light the fire—call a pro to avoid carbon monoxide risk.
Can I just replace the chimney cap myself in Longmont, or is that a job for a pro?
Replacing a chimney cap is one of the few DIY-friendly tasks if you’re comfortable on a ladder. Measure your flue first—most Longmont homes use an 8x12 or 8x16 cap. Choose a stainless steel cap with a mesh screen to keep critters out. If the flue is cracked or the crown is damaged, though, the cap won’t fix the root problem. For a full crown inspection or if your roof is steep, contact us to handle it safely.