11 Things You Should Never Burn in a Fireplace

Ever toss cardboard or junk mail into the fireplace thinking, “Eh, it’ll burn”? You’re not alone. But not everything that burns belongs in your wood-burning fireplace. Some items can release toxic fumes or even spark a chimney fire. Before your next cozy night in, here’s what you should never burn in a fireplace and what to use instead to keep that warm glow safe and healthy.

It might seem like anything that burns can go right in. After all, the smoke and fumes just go up the chimney, right? Not exactly. The U.S. Fire Administration warns that burning the wrong materials can release toxic fumes into your home and neighborhood, damage your chimney, or turn a quiet evening into a full-blown fire emergency.

Each year, thousands of home heating fires start because of what’s burned or how it’s burned. To stay safe, use only dry, seasoned firewood (or manufactured fire logs made for indoor use), and make sure your chimney is cleaned and inspected at least once a year by a professional. And no matter how tempting it is, never leave a fire unattended.

Your fireplace should bring comfort, not chaos. A little caution now means fewer repairs, cleaner air, and a cozier home all winter long.

1. Wet Wood

If your firewood is fresh, damp, or hasn’t had a chance to fully dry, it can contain up to 45% water. That extra moisture creates thick, smoky fires that leave creosote buildup in your chimney, a sticky, flammable residue that’s the number one cause of chimney fires. The fix? Let your wood “season” for at least six months in a dry, covered area before bringing it inside.

2. Painted or Treated Wood

Burning wood that’s been painted, stained, or pressure-treated is like releasing a chemistry set into your living room. Many of these coatings contain toxic substances such as arsenic or heavy metals that become airborne when burned. Keep those for outdoor projects, not indoor fires.

3. Plywood and Particleboard

These materials might look like scrap wood, but they’re glued together with resins that release dangerous fumes when burned. Not only is that bad for your lungs, it can also corrode your fireplace lining and chimney. If you’re cleaning out the garage, resist the temptation to “get rid of it the easy way.”

4. Wooden Pallets

They seem like free, ready-to-burn firewood, right? Not so fast. Many pallets are treated with methyl bromide, a pesticide that turns toxic when burned. Even if you can’t see a treatment stamp, assume it’s been treated and skip burning it indoors. (Recycling or repurposing pallets is a safer, and more creative. option.)

5. Christmas Trees

We’ve all seen those fire department demos of a Christmas tree going up in seconds and for good reason. Pine and fir are loaded with sap and resin, which pop and spark when burned, sending embers up your chimney faster than Santa on Christmas Eve. Dispose of your tree curbside or through a community recycling program instead.

6. Cardboard

Cardboard burns fast and hot, too fast. That rush of flame can quickly get out of control, and if the cardboard has colored ink or tape, it’ll release toxic fumes while it burns. Recycling is the better move here.

7. Dryer Lint

It’s a great campfire starter, but not for your living room fireplace. Dryer lint often contains synthetic fibers and residue from detergents or softeners, which can create fumes when burned. Save it for your outdoor firepit or compost bin instead.

8. Driftwood

Even when it’s dry, driftwood is soaked with salt from its time at sea. When burned, that salt releases chlorine gas, corrosive to your fireplace and chimney and irritating to breathe. It looks rustic, but keep it for décor, not fuel.

9. Household Trash

Paper cups, wrapping paper, bubble wrap, and other household waste can emit dioxins and other harmful chemicals when burned. These toxins can linger in your home’s air and even cause long-term health effects. When it comes to trash, use the bin, not the fireplace.

10. Lighter Fluid or Other Accelerants

Impatience and open flames are not a great combo. Lighter fluid, gasoline, and other accelerants burn at dangerously high temperatures, releasing toxic fumes and creating uncontrollable flames. To get your fire started safely, use kindling or a fire starter log instead.

11. Magazines and Glossy Paper

Colorful pages might look innocent, but the inks used in magazines, catalogs, and gift wrap release chemicals when burned. Those lightweight ashes can also drift up your chimney and land on your roof. Never ideal. Toss them in your recycling bin where they belong.

What You Can Safely Burn Instead

A few sheets of plain black-and-white newspaper are fine for getting your fire started. But when it comes to keeping that cozy glow going, remember this rule of thumb: your fireplace was built for specific fuel. Use it.

For traditional wood-burning fireplaces, stick with dry, seasoned hardwoods like oak, maple, or birch. They burn hotter, cleaner, and longer, giving you more heat with less smoke and creosote buildup. For convenience, manufactured fire logs are another safe, efficient option, especially on nights when you’d rather enjoy the fire than tend to it.

If you have a pellet stove, use only the pellets made for it. They’re specially designed to burn efficiently and keep your system running safely. Substituting other materials (like corn or wood chips) can clog the feed system and shorten your stove’s lifespan.

And one last thing: burning the right fuel isn’t just about safety. It’s about air quality and your home’s health. Clean-burning fires keep your indoor air fresher, your chimney safer, and your conscience a little clearer.

Question: What’s the strangest thing you’ve ever seen someone try to burn in a fireplace? Be honest… was it you? Share in the comments below.

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Please keep your comments positive, encouraging, helpful, brief,
and on-topic in keeping with EC Commenting Guidelines

Richard says:

November 26, 2019 at 7:24 am

We now live in a civilization that is supposed to be fearful of everything. I expect that is due to people not having any semblance of common sense. Putting small amounts of anything in the fireplace will not poison us or the atmosphere. Of course the fireplace is not the proper place for trash disposal, that is why we pay extraordinary amounts of money for this municipal service. I for one will not live in fear of ending the world by my actions.

Anne H says:
November 26, 2019 at 1:16 pm

Even small amounts of toxins can harm people with chronic illnesses! Please be considerate of your guests and neighbors, Richard.
Mary Hunt says:
November 26, 2019 at 2:01 pm

I respect your comments, Richard … but we need to also recognize that lots has changed since the good ol’ days when it was common to burn garbage and all manner of trash. The composition of trash has changed. Cardboard was invented. Treatments for wood that would prevent destruction due to pests and rot. Print now appears in vibrant colors thanks to advanced techniques and inks.

According to the American Journal of Respiratory and Critical Care Medicine, “A hundred years ago, lung cancer was a reportable disease, and it is now the commonest cause of death from cancer in both men and women in the developed world, and before long, will reach that level in the developing world as well. The disease has no particular symptoms or signs for its detection at an early stage. Most patients therefore present with advanced stage IIIB or IV disease.”

It seems to me that simple wisdom would look out for and then avoid situations that might contribute to contracting such a horrible disease. And when doing that is as simple as not burning stuff in the household fireplace, why not err on the side of caution? Just my 2 cents.

What Not to Burn in Your Fireplace (You’ll Be Surprised!)