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What Not to Burn in a Fireplace or Wood Stove
A fireplace is built for dry, untreated firewood. Trash, treated lumber and wet wood produce toxic smoke, heavy deposits and sudden temperature spikes that damage the flue.
The short list
| Do not burn | Why it is a problem |
|---|---|
| Household trash, cardboard, plastics, foam, glossy or colored-ink paper | Releases toxic fumes and can leave hard residue; paper and cardboard flare up and throw sparks or burning pieces up the flue |
| Painted, coated or pressure-treated wood | Smoke carries the chemicals in the coating or preservative |
| Plywood, particle board, or any wood with glue in it | Binders and adhesives burn dirty |
| Ocean driftwood | EPA lists it among materials not to burn |
| Wet, rotted, diseased or moldy wood | Smoky, cool fire; more creosote; mold spores in smoke |
| Gasoline, kerosene or charcoal starter | Flash fire risk. Use kindling and fire starters made for fireplaces |
This list follows the U.S. EPA’s Burn Wise guidance, which also names plastic, rubber, manure and animal remains and says never to use gasoline, kerosene or charcoal starter to light a fire.
Effects on the chimney
- Heavier deposits. Wet or dirty fuel makes a cooler, smokier fire and more creosote. See creosote buildup and chimney cleaning.
- Temperature spikes. Paper, cardboard and gift wrap burn fast and hot. Sudden extreme heat is hard on cracked clay liners and old mortar joints.
- Air quality indoors. Smoke that spills into the room carries whatever was burned.
Cleaning logs are not a substitute. They do not replace sweeping and are covered in our guide on cleaning logs versus professional cleaning.
What is fine to burn
Dry, seasoned, untreated firewood is the standard fuel. A small amount of plain uncoated newsprint or untreated kindling can start a fire. How to judge dryness is in dry firewood: how to season, test and store it.
If you have already burned something you should not have
One accidental burn of a small amount of paper packaging is not an emergency. A fire that included treated lumber, plastics, or a lot of trash is a reason to ventilate the room, let the fire go out and cool on its own, and have the chimney checked if you see unusual smoke, smells or deposits.
Frequently asked questions
Can I burn old pallets or scrap lumber?
Not unless you know exactly what it is. Pallets may be treated, and scrap lumber is often painted, coated or pressure-treated. Dry, untreated firewood is the safe default.
Does burning trash really harm a chimney that looks fine?
It can. Deposits form inside the flue where you cannot see them, and damage to a liner may only be visible on a camera inspection. See chimney camera inspection.
Next step
If something questionable was burned, a chimney inspection will show whether the flue is affected. Request a visit or call (862) 225-6529.
Sources
- U.S. EPA Burn Wise: Best Wood Burning Practices (materials not to burn; never use gasoline, kerosene or charcoal starter)