John Miller Chimney LLC provides chimney sweep services in Longmont, including chimney sweeping & inspection, chimney cap installation, masonry repairs & repointing, and more. Every job is handled by licensed, insured technicians with upfront written pricing, and backed by a workmanship guarantee — free estimates for all of Longmont and nearby areas.
A chimney sweep isn’t just about removing soot—it’s about removing risk. In Longmont’s older homes, creosote can accumulate faster than you’d expect, especially after a cold winter. Our Level 2 inspections (required by Colorado code for homes changing ownership) include a video scan to spot cracks, blockages, or deteriorating mortar that could let heat or carbon monoxide seep into your walls. We use HEPA vacuums to contain dust and leave your chimney cleaner than factory specs. Homeowners in Niwot and Mead trust us to catch issues before they become emergencies—like a loose flue liner that could ignite your roof.
Request this service →A missing chimney cap is like leaving your front door wide open for Longmont’s winter storms. We install custom-fit caps with mesh screens to block rain, snow, and even squirrels from nesting inside your flue. Our caps are built to withstand 80-mph winds (common in Boulder County) and include a spark arrestor to prevent embers from landing on your roof. We match existing masonry or recommend durable stainless steel options that won’t rust in our humid climate. Clients in Longmont’s historic districts see this as a small investment that prevents thousands in water damage repairs.
Request this service →Longmont’s freeze-thaw cycles turn minor cracks in your chimney into gaping holes over time. We diagnose the root cause—whether it’s water intrusion, foundation shift, or poor original construction—and repair it with Type-S mortar that matches your brick’s age and color. Our repointing process includes sealing joints to repel water and adding a chimney crown to shed rain away from vulnerable areas. We’ve restored 1920s bungalows in downtown Longmont and mid-century ranchers in Twin Peaks—always with a focus on longevity and code compliance.
Request this service →Carbon monoxide doesn’t announce itself—it silently poisons. We test your chimney’s draft and flue gases using calibrated meters to ensure your furnace, water heater, or fireplace isn’t leaking CO into your living space. In Longmont, we’ve found dangerous backdrafts in homes with improperly sized flues or blocked vents. Our reports include clear next steps: whether it’s a simple cleaning, a cap adjustment, or a full venting upgrade. Families with infants, elderly members, or pets prioritize this service after hearing about CO incidents in nearby Firestone.
Request this service →If your chimney liner is cracked or missing, burning wood is like running a car engine without a muffler. We install rigid or flexible stainless steel liners that resist corrosion and improve draft, even in Longmont’s high-altitude conditions. These liners also prevent creosote buildup in the flue walls, reducing fire risk. We’ve relined fireplaces in Longmont’s newer subdivisions and restored 1970s homes in the Lefthand Valley area—always with a focus on efficiency and safety compliance.
Request this service →After a windstorm or hail event in Longmont, a damaged chimney can become a liability overnight. We secure loose bricks, reattach caps, and temporarily seal openings to prevent water intrusion until permanent repairs are scheduled. Our emergency team carries spare caps, mortar, and flashing to patch common failure points like missing crowns or dislodged flue tiles. Homeowners in the foothills of Longmont call us when a sudden cold snap reveals a drafty chimney—we arrive with the tools to stabilize it immediately.
Request this service →Fast response, upfront pricing, and workmanship guaranteed. Get your free estimate today.