Short answer: No, never burn pressure-treated wood. The chemical preservatives that make it resist rot turn into toxic fumes and heavy metals when burned, which are dangerous to breathe and illegal to open-burn in most places. Wood that is safe to burn is untreated and properly seasoned or heat-treated, never chemically treated.

Leftover wood from deck boards and fence posts may seem like easy fuel for your burn pile or fire pit; however, that instinct is a costly mistake. Not all wood belongs in a fire, and the difference between safe and dangerous is not always something you can see.

Can You Burn Pressure Treated Wood?

No. Pressure-treated wood does not belong in a fire pit, a wood stove, an outdoor wood boiler, or a backyard burn pile.

Pressure-treated lumber is forced full of chemical preservatives to resist rot and insect damage in decks, fences, and other outdoor structures. Those wood preservatives are what make pressure-treated lumber unsafe to burn. Heat does not destroy them. It releases them into the smoke and concentrates them in the ash. When you burn treated wood, you are breathing in and spreading the chemicals that were sealed into the lumber.

Here is what a fire pulls out of treated wood:

• Heavy metals like arsenic and chromium from older chromated copper arsenate, plus copper from newer copper azole formulas

• Toxic fumes and wood smoke that carry those metals straight into the air around your fire

• Ash laced with harmful chemicals, where even minute amounts can be dangerous to handle

What Makes Treated Wood Dangerous to Burn

Chemical preservatives do not burn away

For decades, most treated lumber used chromated copper arsenate, better known as CCA. CCA-treated wood was largely phased out for residential use in the United States in the mid-2000s, but it still stands in millions of older decks and fences. Burning CCA wood releases arsenic, a heavy metal, into the smoke and leaves it behind in the ash. Just a small amount of ash from CCA-treated wood can hold a dangerous dose of arsenic, which is why direct contact with that ash is a real hazard. Newer copper azole lumber is less toxic than CCA, but it is still treated wood and should never be burned.

Engineered and painted scrap is just as bad

Treated lumber is not the only wood to keep out of the fire. Plywood, particleboard, and other glued construction material release chemical compounds like formaldehyde when burned, and the resins in some engineered products can give off organic compounds and gases such as hydrogen cyanide. Painted or stained scrap lumber adds its own load of harmful chemicals. None of it behaves like regular wood in a fire.

The smoke and ash carry health risks

Any wood fire produces some carbon monoxide and polycyclic aromatic hydrocarbons. Treated and engineered wood stack heavy metals and toxic chemicals on top of that. This results in wood smoke that can cause respiratory problems and ash that qualifies as hazardous waste in many areas. Those health risks apply to a fire pit, outdoor wood boiler, and an indoor wood-burning stove alike.

How to Properly Get Rid of Treated Wood

Treated wood is a disposal problem. Handle it like this:

• Never open-burn it. Open burning of treated wood is banned under most local ordinances and regulations, and a burn permit for yard waste does not cover treated lumber.

• Keep it out of the burn pile. Do not mix scrap lumber in with grass clippings and yard waste headed for a fire.

• Take it to a local landfill that accepts treated wood, and follow local regulations, since some areas classify it as hazardous waste.

• Check first. Contact your local authorities, local government, or fire department before any outdoor burning to confirm what is allowed.

Why ButlerWood's Process Is Different

Here is the contrast that matters. ButlerWood never uses chemical preservatives on its wood. The word "treated" means something completely different in our yard.

Our wood is naturally seasoned in the Texas sun. That is untreated wood, aged by time and heat from the sky, with nothing forced into it. For orders that ship across state lines, the wood is also USDA heat-treated, which means the core of each piece reaches at least 160°F and holds there for a minimum of 75 minutes under USDA-APHIS-PPQ Protocol T314-a. Heat is doing the work, not chemicals.

This process is also different from kiln-dried firewood, which is dried in a heated chamber. Our wood is sun-seasoned first, then USDA heat-treated only when it needs to travel out of state. Wood sold here in Texas is aged naturally.

Every piece of wood is graded by hand before it goes out. "Only the best wood gets to the customer," says Austin Butler, ButlerWood Co-Owner. What reaches your pit or fireplace is clean-burning wood with no preservatives, no heavy metals, and no toxic fumes.

What You Should Burn Instead

The rule is simple. Burn untreated, seasoned hardwood and nothing else. For smoking and grilling, use naturally aged cooking wood like post oak, hickory, or mesquite. For the fireplace or fire pit, use real seasoned firewood. For a hot, clean grill, reach for lump charcoal. You can read exactly how our wood is heat-treated before it ships. Save the treated lumber for the landfill, and keep your fire clean.

Why ButlerWood

When it comes to fuel for your fire, where the wood comes from matters as much as what kind it is. ButlerWood is a family-run, vertically integrated operation in Central Texas, so we clear, cut, season, and haul our own wood instead of reselling someone else's. Nothing is ever forced into it. Our cooking wood and firewood are seasoned under the Texas sun, hand-graded piece by piece, and heat-treated to USDA standards when they ship across state lines. That means clean-burning post oak, hickory, mesquite, and pinon with no chemical preservatives, no heavy metals, and no toxic fumes, just wood that is safe to put in your pit, fireplace, or fire pit. Skip the treated lumber, and start with wood that was made to burn.