First Fire of the Season Fireplace Safety Checklist

By Chimney Sweep Directory Editorial Team · Updated 2026-10-06

Four or five months is a long time for a fireplace to sit unused. That span covers late spring thunderstorms, a full summer of humidity, and whatever wildlife decided your flue looked like a good home in August. When fall finally arrives and you want a fire, the instinct is to just light one. Don’t.

The checks you run before the first fire of the season are different from anything you do mid-winter. The chimney system has been static, exposed to freeze-thaw cycles, moisture, and biological activity, and you haven’t looked at it since last March. Most chimney problems that cause house fires or CO poisoning don’t announce themselves with smoke smell or visible flame. A cracked flue tile looks fine from your couch. A dead bird lodged in the smoke chamber smells fine until you light a fire and push the fumes back into the house.

This checklist walks through what you can check yourself, what you need a professional to assess, and how to handle that first fire safely once you’ve cleared both lists. It covers open wood-burning fireplaces, both masonry and factory-built. If you have a wood stove, the EPA’s wood heater certification rules under 40 CFR Part 60 add a layer of compliance considerations outside this scope, though the fuel quality and seasonal check guidance applies to stoves as well.

Why months of inactivity creates real risk

This is the misconception we hear most often: “I’ll call a sweep if I notice smoke problems.” NFPA 211 Chapter 13 requires a minimum Level 1 annual inspection regardless of whether you’ve noticed any symptoms. The reason is that the structural deterioration that matters most (cracked flue liners, eroded mortar joints, spalling brick) doesn’t produce visible symptoms until it’s well past the point of cheap repair.

Inactivity itself causes damage. Water gets past the chimney crown and into mortar joints. Winter freeze-thaw cycles expand that moisture and crack the masonry. Birds build nests in unprotected flues. NFPA 211 Annex A specifically names the beginning of each heating season as the right time for the annual Level 1 inspection, because this is when all of that summer and fall damage becomes relevant.

The CSIA puts it plainly: inspection at minimum once per year, cleaned as necessary. That’s the floor, not the ceiling.

Step 1: Start your visual check inside the firebox

You don’t need to climb on the roof to do a useful inspection. Get a flashlight, open the damper, and spend five minutes looking at what’s actually inside.

Look at the firebox walls for cracks in the brick or missing mortar joints. Any gap wide enough to fit a credit card into is worth noting for a professional to assess. Check the floor of the firebox for debris, chunks of fallen mortar, or anything that shouldn’t be there. Look up into the smoke shelf area (the ledge just above the firebox behind the damper) for leaves, nesting material, or animal droppings.

The HPBA recommends homeowners inspect the firebox, damper, and visible flue interior for cracks, debris, and obstructions at the start of each heating season. You can do most of that from inside the firebox with a good flashlight. What you cannot assess from there is the condition of the flue liner tiles above the smoke chamber, or the exterior masonry and crown. That’s where professional inspection earns its cost.

If you have a factory-built prefabricated fireplace rather than a masonry one, check the manufacturer documentation before doing any cleaning or component swap. The HPBA is explicit that factory-built systems must be serviced using only components listed for that specific appliance. Using a non-listed replacement part voids the system’s safety listing.

Step 2: Check for animal intrusion and debris

The National Chimney Sweep Guild flags the summer off-season as the most common period for birds and raccoons to nest inside chimney flues. Chimney swifts, starlings, and raccoons all view an uncapped or poorly capped flue as shelter.

You can check for signs from inside without going on the roof:

• Nesting material visible in the firebox or on the smoke shelf
• Animal droppings in the firebox
• Sounds coming from the chimney (birds, chittering)
• A smell that’s distinctly biological rather than smoky

If any of those are present, stop. Don’t light a fire. Don’t try to smoke the animal out. Call a professional sweep who can inspect and clear the flue safely. Some bird species nesting in chimneys are protected under the Migratory Bird Treaty Act, which means you cannot legally remove an active nest yourself.

One common assumption worth addressing: a chimney cap does not guarantee a clear flue. Caps corrode, screens rust and pull loose, and a persistent raccoon can dislodge a poorly fastened cap. A physical check every fall is still necessary.

Step 3: Confirm damper operation before anything else

This step takes two minutes and it’s non-negotiable.

Open the damper all the way. Then close it. Then open it again to the full travel position. You are confirming that it moves through its complete range of motion without binding, and that it opens and closes fully. A damper stuck halfway open wastes heat all winter. A damper stuck partially closed will push smoke into the room.

IRC 2021 Section R1003.9 requires a masonry fireplace damper to have a net free area equal to at least 90 percent of the required flue area. Section R1003.9.1 requires the damper to be operable from the room where the fireplace is located. If yours requires you to reach up into the firebox to operate it, that’s correct design. What’s not correct is a damper that won’t move at all, moves stiffly through only part of its range, or won’t seat fully closed.

Dampers corrode. The metal warps from heat cycles and moisture. A damper that worked fine last March may have seized up over summer, and you won’t find out by looking at it. You find out by operating it.

Step 4: Creosote check and when it becomes the sweep’s problem

Creosote is a byproduct of wood combustion that condenses on cooler flue surfaces. The CSIA classifies it in three stages. First-degree creosote is flaky and brushes off easily. Second-degree is a tar-like coating that’s harder to remove and requires professional brushing equipment. Third-degree is hardened and glazed, and it can fuel a chimney fire that exceeds 2,000°F, hot enough to crack flue tiles and compromise the structural integrity of the chimney.

NFPA 211 Section 14.1 is direct: chimneys shall be maintained free of deposits that could interfere with performance or create a fire hazard, and cleaning is required whenever inspection reveals such deposits.

From inside the firebox, you can shine a light up into the smoke chamber and look for visible black glazing or thick layered deposits on the smoke shelf. What you cannot see is the upper flue liner.

If last season involved a lot of low, smoldering fires, or if you regularly burned wood that wasn’t fully seasoned, assume there’s meaningful creosote accumulation and get a sweep in before you light the first fire, not after. If a professional inspection turns up evidence of a prior chimney fire (cracked tiles, warped metal, glazed third-degree deposits), NFPA 211 Chapter 13 requires a Level 2 inspection before relighting. A Level 2 includes video scanning of the flue interior and a more detailed assessment than the standard annual Level 1.

Step 5: Prime the cold flue before the first fire

Here’s a step most homeowners skip entirely, and then wonder why the living room fills with smoke when they try to light a fire in October.

A flue that’s been closed all summer contains cold, dense air that flows downward. When you open the damper and light a fire without addressing that column of cold air, combustion gases have nowhere to go but back into the room. This is called smoke rollback, and it’s not a damper problem or a draft problem in the mechanical sense. It’s physics.

The CSIA recommends warming the flue before adding kindling. The method: open the damper fully, roll up a piece of newspaper, light it, and hold the burning roll close to the open damper for 30 to 60 seconds. You’re heating the air column directly above the damper and getting the draft moving upward before the main fire starts. Some suppliers sell commercial flue primers for the same purpose, which work on the same principle.

You’ll know it worked when you feel the draft pulling upward through the open damper rather than pushing cool air down into the firebox.

Step 6: Check your CO detectors and smoke alarms

This is not a fireplace-specific step, but it belongs on a first-fire checklist because this is when people actually do it.

The CPSC recommends a CO detector on every level of the home and outside each sleeping area. One detector near the fireplace is not compliant with that standard and won’t protect people sleeping two floors away.

NFPA 72 Section 29.8 requires CO alarms outside each separate sleeping area in dwellings where fuel-burning appliances create CO hazard potential. A wood-burning fireplace with a partially blocked or damaged flue absolutely creates that potential.

Test every CO detector and smoke alarm in the house. Press the test button and hold it until the alarm sounds. Replace batteries in battery-only units if you haven’t done so in the past year. If a detector is more than seven years old, replace it regardless of whether it tests as functional, because the sensor degrades over time. Interconnected alarms are worth the upgrade if your current system doesn’t have them. When one sounds, they all sound.

Step 7: Confirm your firewood before the first load

The EPA Burn Wise program recommends firewood with a moisture content below 20 percent. Green or wet wood burns at lower temperatures, which is precisely the condition that accelerates creosote formation. It also produces significantly more smoke.

Seasoned hardwood that’s been split and stacked for at least a year typically hits that threshold. If you’re buying firewood and the supplier can’t tell you the species or the drying time, a moisture meter (available at most hardware stores for under $30) tells you within seconds whether a piece is ready to burn.

Never burn treated lumber, painted wood, plywood, or household trash. These release toxins during combustion and are prohibited under most local air quality regulations. In non-attainment areas across parts of California, Colorado, and the Pacific Northwest, there are also mandatory no-burn days based on air quality conditions. The EPA Burn Wise site has a resource to check local burn restrictions before you light up on a questionable day.

When to call a sweep before the first fire, not after

The short answer: if you haven’t had a professional inspection in over a year, schedule one before lighting the first fire. That’s what NFPA 211 requires and what CSIA and NCSG both recommend.

Beyond the annual timing, call before lighting if:

• You find animal nesting material or animal evidence in the firebox
• The damper won’t move through full range or won’t seat properly
• You see visible third-degree creosote glazing on the smoke shelf
• You find cracked or missing mortar in the firebox walls
• You have any reason to suspect a prior chimney fire occurred

Professional sweeps in Los Angeles and elsewhere can typically complete a Level 1 inspection and light cleaning in a single visit. If the inspection reveals structural issues, they’ll tell you before you have a fire, not after.

Look for a CSIA Certified Chimney Sweep or an NCSG member. The CSIA credential requires passing a written exam based on current industry standards, so it’s not just a marketing designation.

The first fire itself

Once you’ve cleared the checklist above, the first fire of the season should be a small one. Not a roaring blaze with a full load of logs. A modest fire with two or three pieces of seasoned hardwood lets you confirm draft, observe smoke behavior, and verify the damper is operating correctly under actual conditions.

Sit with it for the first 20 minutes. If smoke rolls back into the room after you’ve primed the flue, there’s a draft problem worth investigating before the next fire. If everything draws cleanly and the fire burns well, you’ve confirmed the system. Build up from there over the next few uses.

One more thing, and we say this every year because homeowners in New Jersey and every other state still don’t do it: book your sweep for next fall before the busy season hits. Chimney sweeps in most markets are fully booked by mid-October. Call in August or September, before you need them, and you’ll actually get the pre-season slot.

Frequently Asked Questions

How often does a wood-burning fireplace need a professional inspection?

NFPA 211 Chapter 13 requires a minimum Level 1 inspection every year, even if the fireplace has been used without any system changes. The start of the heating season is the standard timing. If you had a chimney fire at any point, the standard requires a Level 2 inspection before you light another fire.

Can I check my chimney myself instead of hiring a sweep?

You can do a useful visual check from inside the firebox, confirm damper operation, and look for obvious debris or animal signs. What you cannot safely assess is the condition of flue tiles, mortar joints, and the exterior crown. A CSIA-certified sweep has the tools and training to catch problems that are invisible from the firebox.

What does priming a cold flue mean and why does it matter?

When a flue has been closed all summer, cold dense air fills the chimney column and resists the upward draft. If you light a fire without warming that column first, smoke rolls back into the room instead of going up the flue. Priming means holding a burning rolled newspaper or a commercial flue primer near the open damper for 30 to 60 seconds before adding kindling, which gets the draft moving upward before the main fire starts.

Where should CO detectors be installed in a home with a fireplace?

The CPSC recommends a CO detector on every level of the home and outside each sleeping area. NFPA 72 Section 29.8 requires CO alarms outside each separate sleeping area in homes with fuel-burning appliances. One detector near the fireplace alone does not meet either standard.

Does a chimney cap guarantee animals can’t get in?

No. Caps corrode, screens rust and pull loose, and raccoons can dislodge a poorly fastened cap over a full summer. A physical check for animal signs inside the firebox every fall is still necessary regardless of whether a cap is installed.

What kind of wood should I burn on the first fire of the season?

Only seasoned hardwood with a moisture content below 20 percent. The EPA Burn Wise program specifically recommends this threshold because wet or green wood produces far more creosote and smoke. Never burn treated lumber, painted wood, or household trash, which release toxins and are prohibited under most local air quality regulations.

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