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Treated Timber

(24 products)

Shop our selection of pressure treated timber joists, decking, battens and fencing carcassing. Treated to UC2 and UC3, our range of treated timbers are suitable for a range of projects from structural projects to decking and roofing. 


Frequently Asked Questions

View our help & advice
What is treated timber?

Treated timber refers to wood that has been specially processed with preservatives to enhance its durability, strength, and resistance to decay, insects, and moisture. This makes it an ideal choice for both indoor and outdoor construction projects. At DIY Building Supplies, our range of treated timber is designed to deliver superior performance and longevity, ensuring your projects stand the test of time.

What is pressure treated timber?

It is wood that has been placed in a pressurized vacuum to force chemical preservatives deep into the grain. This makes it resistant to rot, fungi, and insects.

Where should I use it? It’s designed for outdoor projects where wood touches the ground or is exposed to the elements, such as:

  • Decking and joists
  • Fence posts and gates
  • Retaining walls and garden beds

Is it safe? Modern treated wood (like ACQ) is safe for residential use. However, you should never burn it, and you should wear a mask when cutting it to avoid inhaling treated sawdust.

Can I paint it right away? No. Treated lumber is usually saturated with liquid when sold. You should wait several weeks (or until the wood is dry to the touch) before painting or staining, otherwise the finish will peel.

Does it last forever? While it resists decay for 20+ years, it can still warp or crack due to sun exposure. Applying a water-repellent sealer every year or two is recommended to keep it stable.

Why choose treated timber?

Treated timber offers a host of benefits that make it a preferred choice for builders, DIY enthusiasts, and landscapers alike:

  1. Enhanced Durability: The treatment process protects the timber from rot, decay, and insect damage, ensuring long-lasting performance.
  2. Weather Resistance: Treated timber withstands exposure to rain, snow, and UV rays, making it ideal for outdoor use.
  3. Versatility: Available in a variety of sizes and finishes, treated timber can be used for a wide range of applications.
  4. Cost-Effective: Treated timber provides an affordable solution for projects requiring durability and reliability.
  5. Eco-Friendly Options: Many treated timber products are sourced from sustainably managed forests, offering an environmentally responsible choice.
When should I use treated timber?

Treated timber is a versatile material suitable for numerous construction and landscaping projects, including:

  • Fencing and Decking: Provides a sturdy and weather-resistant foundation for outdoor structures.
  • Garden Projects: Ideal for planters, raised beds, pergolas, and trellises.
  • Outdoor Furniture: Ensures long-lasting durability for benches, tables, and other outdoor pieces.
  • Structural Work: Suitable for joists, beams, and framing in construction projects.
  • Cladding and Facades: Protects buildings while enhancing their aesthetic appeal.
  • Play Areas: A safe and durable material for creating play equipment and structures.
Why buy treated timber from DIY Building Supplies?

At DIY Building Supplies, we provide high-quality treated timber that combines strength, durability, and affordability. Whether you’re building a garden fence, constructing a deck, or working on a structural project, our treated timber range offers reliable solutions to meet your needs.

Browse our collection of treated timber today and take the first step toward creating durable, weather-resistant, and visually appealing structures!