7x2 Treated Timber C24

At Materials Market, we're firm believers that prevention is better than cure. 7 x 2 treated timber (sometimes called 175x50 carcassing timber) is a quality C24 grade timber which perfectly demonstrates this point; it's pressure-treated to prevent insect and fungi attacks that would otherwise be costly to repair. We supply high-quality 7 x 2 C24 timber, which comes in 3m, 3.6m, 4.2m, 4.8m and 6m lengths. Longer lengths of 7.2m are available on request.

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What Is 7x2 Timber In mm?

Here at Materials Market, we list timber sizes in a couple of different ways. The most popular way is inches like 7 x 2 but we also use metric, which measures in millimeters (mm). For 7 x 2 timber this would be 175mm x 50mm or 47mm x 175mm. 

We sell 47mm x 175mm on this website and this is used interchangeably with 7 x 2 to refer to the same size of product. The slight discrepancy of 3mm between 47mm and 50mm just means that the finish at the ends is a lot more even and easier to work with. 


What Is 7x2 Wood Used For?

There is a multitude of uses for 7 x 2 C24 graded timber as it is an incredibly versatile construction material suited to both indoor and outdoor use. C24 timber is regularised for ease of handling and structural purposes such as: 

  • Structural and general joinery purposes 
  • Stud walls
  • Roof joists
  • Floors
  • Decks 
  • Diagonal joists
  • Garden furniture and other outdoor projects 

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


What's The Difference Between 7x2 Treated Timber & 7x2 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.


Timber Sizing Explained

Here at Materials Market, all four sides of the timber are planed to give them eased edges that are soft to the touch; an easi edge makes for easy handling. 

With a nominal size of 47mmx175mm, this product actually has a finished size of 45mmx170mm, but this difference is so negligible that it is commonly just referred to as 47x175, or 7 x 2.

Frequently Asked Questions About 7x2 Timber

Can I Paint 7x2 Timber C24?

It’s certainly possible to paint treated timber but an important thing to remember is that treated timber should not be painted immediately after it has been purchased.

When shipped, most 7 x 2 C24 timber is still “wet” and time is needed for the chemicals to settle and dry. 

In terms of time, it can be up to a few weeks before it is dry and ready to be used. This is largely dependent on where the wood is being stored. 

If there is too much heat or direct sunlight, this can cause the timber to warp rather than dry out. Conversely, damp conditions can lengthen the drying out period, prolonging the time before work can begin.


Is It Easy To Cut C24 Graded Timber To My Preferred Size?

Treated wood can be readily cut to your desired length, however, this should only be done with the right equipment, eye protection, and a respirator since 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.

For more length options, click here. 


Treated Timber Benefits

There is an abundance of timber types available on the market from sawn treated timber, untreated timber and sawn carcassing timber. No matter your project, it is essential to always use good quality treated timber as timber is usually located in places that are not easy to get to. This means we usually have no way of knowing if parts of the structure are under attack from insects or dampness.

With C24 graded timber, you won't need to pay mind to 'checking in' on the timber, as its pressure treatment renders it unaffected by both fungal and insect attack. Essentially meaning, it can fend for itself without you maintaining it. 

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


Is 7x2 Treated Timber Environmentally Responsible?

We take great care to ensure that all of our treated timber available for purchase is Forest Stewardship Council (FSC) or Programme for the Endorsement of Forest Certification (PEFC) certified, which means the timber that we stock is responsibly sourced from environmentally friendly sources.