In Northglenn, where freeze-thaw cycles crack brick and mortar, DIY masonry repair can backfire. Skip the pros only for cosmetic fixes like loose mortar joints on the crown. Call a licensed chimney sweep immediately if you see spalling brick, water stains inside the flue, or cracks wider than 1/8 inch, these signal structural failure. The Chimney Safety Institute of America warns that improper repairs can void warranties and create fire hazards, especially in older homes near I-25 where chimneys bear decades of wear. Book a free inspection before your first fire of the season to avoid costly emergency repairs.
Why a thorough chimney inspection, beyond just peering into the flue, protects your home’s safety before winter’s first fire
Northglenn’s older neighborhoods, like those near the Northglenn Mall area, often have chimneys built with 1970s-era brick that’s now crumbling from moisture and temperature swings. A true inspection goes beyond sweeping: it checks for spalling (flaking) brick, cracked mortar joints, rusted damper hardware, and even improper clearances to combustible materials like roof shingles. The Chimney Safety Institute of America (CSIA) recommends this every year for wood-burning chimneys and every two years for gas, especially in Northglenn, where dry winters can hide moisture damage until it’s too late. If you’ve never had one, schedule it now before the holiday rush drives up prices by 30%. Pro tip: Ask about our fall inspection specials before November 1st, we’ll include a free creosote level check.
2. DIY mortar repointing is safe for surface cracks, but only if the damage is less than 1/8 inch wide and the brick isn’t spalling.
Northglenn’s clay brick chimneys (common in homes built between 1950 and 1980) often develop hairline cracks from seasonal expansion. For these, you can use a high-temperature mortar mix and a pointing trowel to tuck fresh mortar into joints. However, if the crack runs through the brick itself or the mortar crumbles when you touch it, that’s a sign of deeper water damage. The EPA’s Burn Wise program notes that improper DIY repairs can trap moisture, accelerating rot in the wood framing behind your chimney, a hidden cost that adds $1,200–$3,500 to repairs if ignored. For anything beyond surface-level fixes, call a pro. We offer same-day estimates for masonry repairs in Northglenn to avoid winter delays.
3. Water stains inside your flue mean your chimney cap or crown is failing, and DIY fixes won’t last through Northglenn’s freeze-thaw cycles.
If you see dark streaks or rust spots on the inside of your flue, moisture is seeping in through gaps in your chimney cap or a cracked crown. Northglenn’s high altitude and rapid temperature drops (from 70°F days to sub-freezing nights) cause brick to expand and contract, widening these gaps over time. A DIY cap might hold for a season, but without proper sealing, water will keep penetrating, eroding the flue liner and brickwork. The National Fire Protection Association (NFPA) reports that water damage is the #1 cause of chimney fires in Colorado, often because homeowners patch leaks with caulk instead of replacing the cap entirely. Our waterproofing service includes a free assessment of your cap’s condition before winter hits.
4. Should I replace my chimney cap myself if it’s just rusted? No, rust is a symptom of a failing cap, not the only problem.
A rusted chimney cap isn’t just unsightly; it’s a sign that moisture has already compromised the underlying metal. In Northglenn’s dry climate, rust forms quickly on galvanized steel caps because the thin coating wears down faster when exposed to wind-driven rain and snowmelt. While you might replace the cap yourself for $50–$100, the real issue is often a cracked crown or missing flashing that’s letting water in. The Chimney Safety Institute of America warns that a poorly installed cap can create a vacuum effect, pulling toxic gases like carbon monoxide into your home. We install only CSIA-certified caps with stainless steel hardware, and we’ll check for hidden damage during the process.
5. Is it worth repairing a chimney with spalling brick? Only if the damage is isolated to the outer surface, and even then, act fast.
Spalling brick (where the outer layer flakes off like paint) is a clear sign your chimney’s integrity is compromised. In Northglenn, this often happens on south-facing chimneys exposed to direct sunlight during the day and freezing temps at night. While you might patch a few loose bricks yourself, spalling indicates deeper moisture penetration that’s weakening the internal structure. The U.S. Environmental Protection Agency advises that spalled brick can expose your home to creosote fires and even structural collapse during high winds, common in Northglenn’s spring storms. Our masonry repair service includes a structural assessment to determine if partial repair or full relining is needed before winter.
6. Do I really need a professional if my chimney leaks only when it rains? Yes, especially in Northglenn’s high-altitude climate.
A chimney that leaks only during rain might seem minor, but in Northglenn’s dry winters, that moisture can freeze and expand in the masonry, causing cracks to spread. Over time, this leads to costly repairs like relining or even chimney replacement. The NFPA’s NFPA 211 standard requires that all chimneys be waterproofed to prevent exactly this scenario. DIY waterproofing sealants often fail within a year because they can’t handle the extreme temperature fluctuations Northglenn experiences. Our waterproofing system uses a breathable membrane that lasts 10+ years, and we’ll inspect your flashing and cap for hidden leaks during the process.
7. When should I call a chimney sweep for masonry repair instead of waiting? If you see any of these 3 signs, act now.
Northglenn’s older homes (especially those near the Northglenn Golf Course area) often have chimneys built with substandard materials. Here’s when to call a pro immediately: - Cracks wider than 1/8 inch: These can let in water and smoke, creating a fire hazard. - Bulging or leaning brick: A sign of structural failure that could collapse during a windstorm. - White, powdery residue on the flue: Indicates active moisture damage that’s eating away at your masonry. The Chimney Safety Institute of America recommends that any masonry repair be done by a certified technician to ensure proper mortar mix and bonding. Our CSIA-certified technicians offer free estimates for masonry repairs, and we’ll prioritize Northglenn homes before the holiday season to avoid last-minute rush pricing.
| Repair Type | DIY Cost Range | Pro Cost Range | When to DIY | When to Call a Pro |
|---|---|---|---|---|
| Mortar joint repointing (surface cracks only) | $20–$50 (materials) | $150–$300 (labor included) | If cracks are <1/8" and brick isn’t spalling | If mortar is crumbling or cracks are wider |
| Chimney cap replacement (rusted or damaged) | $50–$150 (basic cap) | $200–$450 (pro install + inspection) | Only if cap is slightly rusted (not leaking) | If cap is leaking, cracked, or improperly sized |
| Crown repair (small cracks) | $30–$80 (mortar) | $300–$600 (full crown replacement) | If cracks are hairline and crown isn’t crumbling | If crown is spalling, cracked, or missing sections |
| Waterproofing sealant application | $100–$200 (DIY kit) | $500–$1,200 (pro membrane system) | Never: DIY sealants fail in Northglenn’s climate | Always, pro systems last 10+ years |
| Spalling brick repair | $100–$300 (patch kit) | $800–$2,500 (full masonry repair) | Only for cosmetic surface fixes | If brick is flaking, cracked, or structurally compromised |
Frequently Asked Questions
Should I DIY my chimney’s crown repair if it’s just a few small cracks?
No, even small cracks in the crown can trap moisture, leading to spalling brick and structural damage. Northglenn’s freeze-thaw cycles will widen those cracks over time. Use a high-temperature mortar mix only for surface-level joints, but replace the entire crown if it’s cracked or crumbling. We offer same-day crown repairs with a 5-year warranty to prevent winter leaks.
Should you fix rusted chimney flashing now, or wait until it causes a leak during Northglenn’s next snowstorm?
Yes, but don’t wait. Rusty flashing means moisture is already penetrating your roof and chimney. In Northglenn’s dry climate, this can lead to hidden rot in the wood framing behind your chimney. Replace it with stainless steel flashing and reseal the joints with a high-temperature sealant. Our flashing repair service includes a roof inspection to check for hidden damage before it becomes a bigger issue.
Do I really need a professional to check my chimney’s mortar joints if they look fine?
Yes, mortar joints can hide deep cracks or voids that trap moisture. The Chimney Safety Institute of America recommends a professional inspection every year for wood-burning chimneys, as even small gaps can lead to creosote buildup and fire risks. Book a fall inspection now to avoid winter price surges, we’ll check your mortar, brick, and flue in one visit.
Can I use a DIY waterproofing sealant on my Northglenn chimney instead of hiring a pro?
No. DIY sealants often fail within a year because they can’t handle Northglenn’s extreme temperature swings. A professional waterproofing system uses a breathable membrane that prevents moisture while allowing the chimney to dry. Our waterproofing service includes a 10-year warranty against leaks, and we’ll inspect your cap and crown for hidden damage during the process.