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8x2 Treated Timber C24

8x2 treated timber, often referred to as 200x50 timber, is one of the mainstays of the building trade. It is a high quality C24 graded timber which has been sawn to the necessary length and pressure treated with chemicals to prevent fungal or insect attack. Here at Materials Market, we sell 8x2 C24 timber, which comes in 3m, 3.6m, 4.2m, 4.8m, 5.4m, 6m and 7.2m lengths and can then be cut or sawn to whatever length is required for the individual project.

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What does C24 carcassing timber mean?

C24 grade is superior to others like C16 and means that the timber has greater strength with more knots than the lower graded timbers. This makes it better for tasks which require durability and sturdiness such as structural tasks like roof or floor joists. This increased quality also tends to be reflected in the fact that C24 treated timber is more expensive than C16 or other lower grades.

Carcassing timber is timber that has specifically designed for use in structural applications, such as floor joists or roof battens. Our C24 carcassing timber - with its enhanced strength and durability - is suitable for these applications, and will provide a sturdy building structure.

What is 8x2 carcassing timber used for?

There are many different applications for 8x2 carcassing timber as it is a versatile structural building material that is suitable for both indoor and outdoor use, thanks to the sealing and treating of the timber. 8x2 treated timber can be used in many building applications, including flooring and roofing.


50x200 carcassing timber is mostly used as 8x2 floor or ceiling joists. A joist is a load bearing support that makes up part of the frame for the roof or floor and will normally join opposing walls. They tend to run horizontally, span an open space and outnumber roof beams. 8x2 timber joists are ideal for this as the C24 8x2 graded timber is strong and sturdy.  

Explain the difference between 8x2 treated timber and 8x2 sawn timber?

Sawn timber is wood that has been cut to the required dimensions but hasn't been pressure treated and kiln dried. In the construction industry, pressure treated timber is popular as it provides many benefits, including protection from adverse weather conditions.


The pressure treatment process that imbues treated timber with this resistance often includes copper and organic co-biocides in order to repel both insects and moisture and give it a high degree of protection against both of these potential hazards. Treated timber is sometimes referred to as tanalised timber, after the preservative (tanalith E) that is used in the treatment process. Following the treatment, the timber lengths are put in an oven to be kiln dried.

It is important to use treated timber for construction projects as the majority of the timber used in building is in places that are not easily accessible, so you wouldn’t have any way of knowing if it were under attack from insects or if dampness was affecting it.


Here at Materials Market, all our timber is treated with preservatives, kiln dried, and then planed on all four sides to give it eased edges that make easy handling. Timber sizes are often referred to as either nominal or finished. With a nominal size of 47mmx200mm, this product actually has a finished size of 45mmx195mm, but this difference is so negligible that it is commonly just referred to as 47x200, or 8x2.

Frequently asked questions about 8x2 timber

Is it possible to paint 8x2 timber C24?

It is entirely possible to paint treated timber but it does come with its own complications due to the treatment process and the chemicals that are ordinarily be involved in this. Just remember that it isn’t a good idea to paint treated timber too soon after you have bought it.

This sounds slightly strange but it is actually because when shipped, most 8x2 C24 is still “wet” and needs time for the chemicals in the water to settle and to dry. It is entirely normal for the wood to be noticeably heavier at this point and feel damp to the touch.

If primer or paint is added to it at this stage, it will most likely be rejected by the water based chemicals that are still active in the wood. It is vital to allow the wood to dry out fully before attempting to add any paint or primer to it. This process can take up to a few weeks depending on where the wood is being stored. Too much heat and direct sunlight can cause the treated timber to warp instead of dry out and damp conditions can prolong the drying out period, so it is important to get this right. 

Is it easy to cut 8x2 treated timber to my preferred size?

It is fairly easy to cut treated timber to the size that you need, though this should only be attempted with the appropriate power tools and a respirator should be worn as there will be tiny airborne particles released into the air, possibly containing the chemicals used in the pressure treating process. Eye protection is also highly recommended for this task.


These chemicals should not be ingested so it is important to heed the necessary safety precautions before attempting to cut the treated timber. Treated timber cuts a little more like a wet wood so great care must be taken to ensure the blade doesn’t slip while cutting.

Although it is a little more difficult than cutting sawn timber, it is not massively more difficult to cut treated 47x200 timber to the sizes that you need for your project. As long as care is taken, it can be achieved relatively easily. This material is considered versatile for a reason and if it was too difficult, it wouldn’t be so popular among both professional tradespeople and hobbyists alike.

How much does 8x2 carcassing timber cost?

Carcassing timber is a very common and therefore relatively inexpensive building material. 200x50 treated timber prices are prone to fluctuation depending on demand. C24 treated timber does tend to be more expensive than the lower grades of timber due to the impressive strength and durability that are its hallmark. We would be happy to provide you with a very competitive price if you wish to buy 8x2 timber through Materials Market.

Is 8x2 treated timber environmentally sustainable?

All of the treated timber for sale 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.