What Can You Safely Burn in Your Fireplace?

The short version is easy to remember: burn only well-seasoned wood, and nothing else. It sounds simple, but on a cold night it is genuinely tempting to toss in the cardboard box the delivery came in, or the wrapping paper piling up after the holidays. Resisting that urge is one of the most important things you can do for both your safety and the life of your chimney, because what goes into the firebox has a direct effect on how much creosote coats your flue.

Why seasoned wood matters so much

Seasoned wood has been split and left to dry for six months to a year, bringing its moisture content down to roughly 15–20 percent. Dry wood ignites easily and burns hot and clean, sending most of its energy into your home as heat.

Wet or green wood does the opposite. A large share of the fire’s energy is wasted just boiling off the water trapped in the wood, so it burns cooler and far smokier. That cool, moisture-heavy smoke condenses on the walls of your flue as creosote — the sticky, highly flammable residue that is the leading cause of chimney fires. Burn unseasoned wood all winter and you are effectively coating your chimney in fuel.

What you should never burn

Some materials are dangerous no matter how dry they are. Keep all of these out of your fireplace:

• Wrapping paper, cardboard, and newspaper — they burn extremely hot and fast, sending flaming scraps up the flue that can ignite creosote in an instant
• Treated, painted, stained, or pressure-treated lumber — it releases toxic chemicals and fumes into your home
• Foam packaging, plastics, and household trash — these produce toxic smoke and leave heavy residue behind
• Driftwood — the absorbed salt releases corrosive compounds that damage your flue
• Any accelerant like gasoline, lighter fluid, or charcoal starter — these cause dangerous flare-ups

A quick word on holiday trees, too: never burn a dried-out Christmas tree. The needles and sap flash off in a fast, intense burst of flame that can easily send fire into the chimney.

How to tell if your wood is seasoned

You do not need a moisture meter to make a good judgment (though they are inexpensive and handy). A few simple signs give it away:

• It is noticeably lighter than fresh-cut wood, and the cut ends have darkened and cracked in a star pattern
• Knocking two pieces together makes a sharp, hollow, ringing sound rather than a dull thud
• The bark peels off easily and the wood has a grayish, weathered look

Store it right and it stays ready

Even well-seasoned wood will reabsorb moisture if it sits on wet ground or under a tarp that traps humidity. Keep your woodpile up off the ground, covered on top but open on the sides so air can move through, and give the wood time before you need it.

One regional note: the humid mid-Atlantic summers mean wood dries more slowly here than in a dry climate, so "seasoned since spring" often is not truly ready by fall. Firewood sold locally as seasoned regularly still tests high on a moisture meter. If you burn oak — the dense hardwood most common in this area — give it a full year to a year and a half split and stacked, not a single summer.