75 x 225mm Treated Timber C16/C24 Graded Kiln Dried and Regged

9x3 Treated Timber C16/C24 Grade

Also referred to as 9 x 3 treated wood or 3 x 9 treated timber, this relates to the old imperial sizes of 9 inch by 3 inch and 3 inch by 9 inch. Sold by the stated nominal size of 75 x 225mm, the actual finished size of the sawn carcassing timber is around 70 x 220mm but may vary slightly. The lengths of carcassing timber are regularised (regged) which gives a smoother edge that takes 5mm from nominal width and 2mm from the nominal thickness. Slightly rounded edges along the lengths are then achieved after this process which improves handling

Do I need C16 Treated 9 x 3 Timber or C24 Treated 9x3 Timber? What's the difference?

If you need wood for structural support, kiln-dried softwood like C16 and C24 are popular choices, but understanding their differences is key to a successful project.

Strength:

Grading acts like a strength ranking. C24, the top performer, excels with exceptional strength and near-perfect appearance. C16, a close second, offers solid strength with possible minor imperfections.

Application:

Need maximum power? C24's the go-to. Perfect for heavy-duty uses like beams or load-bearing walls. C16, while robust, works best for less demanding tasks like stud walls or internal structures.

Always remember:

C16 and C24 grades are both suitable for construction. The key lies in matching the specific needs of your project with the strengths and characteristics of each grade.

Things to consider that effect grading:

• Knots - More knots mean less strength
• Insect damage or woodworm holes
• Shakes or splits along the grain of the wood
• Slope of the grain
• Wane - bark or a lack of wood fibre on the edge of a piece of lumber

9 x 3 C24 timber is visually graded and is therefore a higher quality product.

Owing to the ever increasing demand, most locations in the UK will now supply C24 graded timber. In some regions though, 9x3 C16 timber will be supplied. If you have a specific requirement, please check before buying.

What is 9 x 3 Treated Timber used for?

C24 9x3 timber treated offers impressive strength, perfect for structural applications such as:

• Timber rafters

• Roof joists

• Floor joists

• Base for decking (must be treated if used externally)

If you need to know more about 9x3 rough sawn treated timber, we have great timber for roofing blog.

If you're planning on using 3x9 treated timber for 225mm floor joists, care must be taken to ensure the clear spans are suitable to take the required load. If you're not sure, check the Span Table.

What lengths are available in 75 x 225 treated timber?

Sizes listed in the drop-down menu are:

• 9x3 treated timber 2.4m
• 9x3 treated timber 3m
• 9x3 treated timber 3.6m
• 9x3 treated timber 4.2m
• 9x3 treated timber 4.8m
• 9x3 treated timber 5.4m
• 9x3 treated timber 6m

**Please note, all sizes in the menu may not be available as it depends on regional stock. If you require any length over 4.8mtr, please contact us before making a purchase as longer lengths are only available from selected locations.**

If there is any issues with the lengths purchased, you will be contacted within 1 working day to discuss the options.

3x 9 treated timber in mm is considered to be 75x225mm but as previously mentioned the actual size C16 or C24 Timber supplied would finish around 70 x 220mm.

Don't want treated timber 9x3? Need a different size? Buildershop can help with your treated timber supplies in Yorkshire where we are based or across the whole UK. By clicking on C16 Kiln Dried Graded Timber - Treated you'll see the most common sizes and grades.If you have a requirement not listed on our website, please get in touch and we'll be happy to try and help.