6x2 Timber Joists Treated C24

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6 x 2 treated timber, often called 150x50 carcassing timber, is a mainstay of the building trade. This high-quality C24 grade timber is sawn to length and pressure treated with substances that inhibit both fungal and insect attack. At Materials Market, we sell 150x50 C24 timber in various lengths which can then be cut or sawn to whichever length your project requires.

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What Is 6x2 Timber? 

Primarily used in the structural framework of buildings, 6x2 timber is essential for constructing beams, joists, and trusses that require robust, reliable support. Its treatment and C24 grading make it particularly suitable for larger projects that demand a higher degree of structural integrity. 

Offering superior strength and durability, 47x150 treated timber is especially suited to carcassing, often being utilised as joists in roofing or flooring. 

Additionally, the preservative treatment this timber undergoes ensures it can withstand the rigours of both indoor and outdoor environments, making it a versatile choice for everything from residential construction to commercial buildings and outdoor structures.


What Is 6x2 Pressure Treated Wood Used For? 

  • Flooring
  • Roofing - rafters/joists in a loft floor
  • Walling
  • Decking joists - as it is able to bear heavier loads than ungraded timber (or that which is graded to a lower level such as C16.)
  • Carcassing timber in floor joists
  • Garden furniture and other outdoor projects  

6x2 Timber Benefits

  • Superior Grading with C24:
    • Strength Over C16: This higher-grade timber offers enhanced strength and durability.
    • Versatile Applications: Suitable for both indoor and outdoor applications.
    • Weather-Endurance: Treated wood is primed to withstand environmental conditions, ensuring longevity.
  • Optimal Load-Bearing: Can accommodate heavier weights, surpassing the capabilities of lower-graded or ungraded timber. This makes it especially suited for structural applications where strength is paramount.
  • Endurance in External Applications: The treatment process equips the timber to endure the rigours of external elements, making it an ideal choice for outdoor projects.
  • Consistent Quality: Materials Market offers a finished size of 45mm x 145mm, emphasising precision in product delivery.


6x2 Timber Sizing Explained

6x2 timber is most often measured in inches, which is an imperial measurement, though it is sometimes measured in metric and this is where millimetres (mm) come into play. 

The sizing of 6x2 timber is considered to be either:

  • Nominal Size: 47mm x 150mm
  • Finished Size: 45mm x 145mm


This slight discrepancy is accounted for by the way the timber is cut and prepared. The difference in the two sizes is minuscule and should not make a meaningful difference to your project. At Materials Market, we sell the finished size (45mm x 145mm). 

6x2 Timber Treatment 

Tanalith E is applied to 6x2 timber through a process called pressure treatment. During this process, timber is placed in a closed cylinder, and the Tanalith E solution is forced into the wood under high pressure. 

This method ensures deep penetration of the preservative, providing long-lasting protection throughout the entire piece of timber.

Tanalith E is a popular type of wood preservative used in the treatment of timber. It's a water-based solution that includes copper and triazole compounds as active ingredients. This preservative is highly effective at protecting wood from fungal decay, wood rot, and wood-boring insects. 

Frequently Asked 6x2 Questions

What Lengths Does 6x2 Timber Come In?

Our high-quality C24 grade treated timber comes in 2.4m, 3m, 3.6m, 4.2m, 4.8m, 6m and 7.2m, with a consistent thickness of 47mm.


Is It Possible To Paint 6x2 Treated Timber?

Yes, you can absolutely paint treated timber. However, it is a good idea to allow the wood to dry completely before adding any paint or primer to it. This can take up to a few weeks depending on the environmental conditions of the storage area. Heat and direct sunlight can cause the treated timber to warp instead of dry out and damper conditions can prolong the drying out period. 


What Is The Cost of 6x2 Timber?

Carcassing timber is a pretty common and relatively inexpensive building material. 47x150 C24 timber prices are often prone to fluctuation depending on the supply and demand at the time. 

We will provide you with a very competitive price if you wish to buy 6 x 2 timber through our website. All our prices are per length. Timber prices are often referred to per by the metre. To convert a length price to a metre price, simply divide the length price by the length of the timber.


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