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Treated timber

Treated timber is widely used across modern construction projects for structural framing, outdoor works, and garden features. Builders select it for its durability against rot, fungi, and insect attack. Treatment processes have evolved from early creosote methods to today’s pressure treatments using preservatives that penetrate deep into the wood. You can source treated sawn timber in a wide range of sizes from suppliers like B&Q and Huws Gray for frameworks, fencing, landscaping, and decking. Options include rough sawn treated timber for structural work where a smooth finish is not essential.

Traditionally, untreated hardwoods were used for exposed work, but treated softwoods are often preferred due to cost, ease of handling, and availability. Builders today choose from products such as treated carcassing timber, fence posts, gravel boards, and decking joists. Many treated timber sizes are manufactured to suit common building standards, making it easier to plan and complete projects quickly.

Check Buildbuddy to find the best prices on treated timber from trusted UK suppliers.

78 results

Retailer

  • Huws Gray (32)

  • Builder Depot (24)

  • Lords (24)

  • Materials Market (20)

Brand

  • BSW (30)

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Treated Timber – FAQs

1. What is treated timber?

Treated timber is wood that’s been infused with chemical preservatives to protect it from rot, insects, and fungal decay. The treatment is usually pressure-applied to make sure it goes right through the wood, making the timber suitable for structural and outdoor use.

2. Can you paint treated timber?

Yes, you can paint treated timber, but it must be dry before you do. Timber is often damp after treatment, so allow adequate drying time—this can take several weeks. Use a primer designed for exterior wood, followed by a compatible paint or stain.