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6x2 Timber Joists Treated C24

(13 Products)

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 2.4m, 3m, 3.6m, 4.2m, 4.8m, 6m and 7.2m lengths which can then be cut or sawn to whichever length your project requires.

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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.

6x2 Pressure Treated Wood Applications 

C24 timber is the superior cousin of C16. Offering superior strength and durability, 47x150 treated timber is especially suited to carcassing, often being utilised as joists in roofing or flooring. C24 timber is fine to use in external applications as long as it has been treated. Treated wood can endure the elements and is therefore ideal for decking, external buildings, and other applications.

Some other examples of how 6 x 2 timber lengths can be used are: 

  • 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 

For other load-bearing materials, check out our Sheet Materials category here. 

What's The Difference Between Treated Timber & Sawn Timber?

Sawn timber is wood that has been cut to the required dimensions but hasn't yet been pressure treated and kiln dried. Pressure-treated timber, otherwise known as tanalised timber (due to the Tanalith E wood preservative that impregnates the wood) provides many benefits, such as resistance to the elements.

The goal of pressure treating wood is to force preservative chemicals deep into the timber's cellular structure. This pressure treatment process will often include copper and organic co-biocides, which help to repel both insects and moisture.

Please note: timber is a natural product that may vary in colour, visual details, knots, grain, and texture. 

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). 

Frequently Asked 6x2 Questions

What is C24 Timber? 

The term "C24 grade" is used to describe a higher timber quality than that of C16. C24 timber is a premium choice that can support higher loads and wider spans. Only timber imported from areas where the weather conditions demand a slower growth rate (and hence a tighter grain) achieves a C24 grade.

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.

Is 6x2 Timber Environmentally Friendly?

All of the treated timber available for purchase on the Materials Market website is Forest Stewardship Council (FSC) or Programme for the Endorsement of Forest Certification (PEFC) certified, which means that our timber is responsibly sourced from environmentally responsible suppliers.

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