Can You Burn Treated Timber?

Can You Burn Treated Timber?

Burning wood is a common way to generate heat, dispose of offcuts or fuel an outdoor fire. However, when it comes to treated timber, the question arises—can you burn it safely? 

The short answer is no. Treated timber is chemically infused to protect against rot, pests and moisture, and burning it releases toxic fumes that can be harmful to both human health and the environment. 

In this guide, we’ll explain why burning treated timber should be avoided, what risks it poses, and how to dispose of it safely.

What Is Treated Timber?

Treated timber refers to wood that has been chemically enhanced to extend its lifespan and improve its resistance to decay, moisture and insect infestations. This type of timber is commonly used for outdoor construction, including:

  • Fencing and decking
  • Garden sleepers and pergolas
  • Structural timber for outdoor buildings

During the treatment process, the wood is infused with preservatives such as Tanalith, creosote, or CCA (Chromated Copper Arsenate, now largely phased out in the UK). While these treatments significantly improve durability, they also introduce chemicals that make burning the wood potentially dangerous.

How to Safely Dispose of Treated Timber

1. Reuse & Repurpose

If your treated timber is still in good condition, consider reusing it for DIY projects, landscaping or other non-burn applications. It can be repurposed for:

  • Outdoor furniture
  • Raised garden beds (if using safe, modern treatments)
  • Decorative woodwork

2. Proper Disposal Methods

For treated timber waste that can’t be reused, responsible disposal is essential:

  • Take it to a licensed waste disposal or recycling facility that can process treated wood safely.
  • Contact your local council for guidance on where to dispose of treated wood in your area.
  • Never throw treated timber into general waste bins or burn it in domestic stoves or garden fires.

3. Alternatives to Burning

If you need firewood for heating or outdoor use, choose safe, untreated options such as:

  • Kiln-dried logs
  • Natural firewood from untreated timber
  • Wood briquettes or eco-friendly alternatives

These options provide a safe and efficient way to burn wood without releasing harmful toxins into the air.

Conclusion 

Burning treated timber is not only unsafe but also illegal due to the toxic fumes and environmental damage it causes. Instead, opt for safe disposal methods or repurpose treated wood where possible. 

If you’re looking for high-quality timber that’s safe for your next project, visit MSS Timber for a range of untreated timber options perfect for construction and DIY.

Ready to source the right timber for your project? Visit the MSS Timber website or contact us for expert advice!