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9x3 Timber Treated

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In comparison to the likes of C16-graded timber and other lower grades, 9x3 treated C24 timber has the whip hand in terms of strength and durability. Its composition comprises considerably fewer physical defects and knots. Applicable in structural applications such as flooring joists, roofing, as well as timber frame stud walls, our 9x3 sawn timber range is sawn to length and pressure-treated with chemicals to prevent insect attack and fungal decay. 

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What Is 9x3 Timber Used For?

9x3 carcassing timber is perfect for first-fix structural applications such as floor joists, roof joists, and timber framing construction. We recommend 9x3 carcassing timber for the following applications: 

  • Stud walls
  • Joists - roofs, floors and decking
  • Structural and general joinery applications
  • Timber framing construction


We stock 9x3 timber in lengths of 3.6m, 4.8m and 6m- these are also available in packs of 35.


It's not just building materials that we sell, however, we also stock a wide range of accessories (such as wood screws) to help you get your project underway. 


Should you require a different size, we stock a wide range of sizes and metre lengths of timber to accommodate your project needs.

9x3 Timber Benefits 

  • Graded to a superior C24 standard - excellent tensile strength
  • Quality machined and regularised with an eased edge - comfortable handling
  • High-density
  • Finished size is 220 mm x 70 mm ( 9″ x 3″)
  • Pressure treated with Tanalith 'E' - helps to prevent rot and protect from moisture 
  • Kiln dried for extra stability 
  • FSC Certified - responsibly sourced 


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

9x3 Timber Sizing Explained

9x3 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 9x3 timber is considered to be either:

  • Nominal Size: 75mm x 225mm
  • Finished Size: 72mm x 220mm

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 (72mm x 220mm).
 

What Does C24 Grade Mean?

At Materials Market, we only sell the highest quality C24-graded 9x3 timber. But what does C24 mean exactly?

C24 grade is the superior cousin of C16 and offers a stronger, more robust product than lower-graded timbers. This is due to the fact it comprises considerably fewer knots and has a tighter grain. It is this increased strength which renders C24-graded timber compatible with structural applications that require durability and sturdiness. 

On top of this, C24 timber is particularly ideal for bearing heavier loads and spanning wider areas than lower-graded timbers. This high-quality timber can only be sourced from regions where the climate produces a slower growth rate (and tighter grain).

Why Choose Treated Timber? 

Without treatment, timber is generally quite a vulnerable material. Not only is it susceptible to moisture damage but it is also prone to weaken with weathering and insect attack. Treated timber, on the other hand, is treated with chemicals and preservatives to prolong its lifespan. 

Here are just a handful of the benefits on offer with treated timber:  

  • It is treated to resist rot, decay and insect attacks
  • The most durable timber option which offers extra stability, making it ideal for outdoor use
  • Thanks to its treated nature, treated timber is also low-maintenance
  • You won't have to spend time and money regularly maintaining it

What Does Pressure Treated Mean? 

Pressure-treated wood goes through a process chemical infusion process to create a more durable and long-lasting product.

It's imperative to remember that while this type of treatment helps prevent rot and insects, weathering and corrosion are still possible over time.

Frequently Asked 9x3 Questions

What Is A First-Fix Construction? 

In construction, the term 'first-fix' essentially entails the construction work required to take a structure from its foundation to the stage of applying internal surfaces - typically the plastering of internal walls. 


Can You Burn Pressure-Treated 9x3 Timber? 

Under no circumstances should pressure-treated wood be set alight. The fumes released when pressure-treated wood burns can be harmful to health and the ash itself is toxic. 


We advise against using pressure-treated wood for making any form of food preparation surface due to this toxicity. 

Is It Possible To Paint 9x3 Timber C24?

Pressure-treated wood can be painted or stained, but to get a finish that lasts and looks premium, you'll first need to evaluate the moisture content of the timber.

Once you are sure the timber is dry, you can then move on to using a suitable primer and paint finish. We recommend using a latex primer with compatible exterior latex paint—water-based paint. Oil-based paints are not recommended.

Am I Able To Cut 9x3 Timber To My Preferred Size?

Yes, it is possible to cut treated timber, provided that you have all the appropriate power tools, eye protection, and a respirator to hand before cracking on. Donning the correct PPE is essential as the cutting process releases tiny airborne particles of wood, possibly impregnated with the chemicals used in pressure-treating.

Treated wood also cuts a little more like wet wood so some extra care should be afforded to ensure the blade doesn’t slip while cutting. 

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