75 x 175mm Timber C16/C24 Graded Kiln Dried and Regged

7x3 Timber C16/C24 Grade

Also referred to as 7 x 3 wood or 3 x 7 timber, this relates to the old imperial sizes of 7 inch by 3 inch and 3 inch by 7 inch. Sold by the stated nominal size of 75 x 175mm, the actual finished size of the sawn carcassing timber is around 70 x 170mm but may vary slightly. The process of regularising (regged) gives a smoother edge that takes 5mm from nominal width and 2mm from the nominal thickness. Slightly rounded edges on the lengths, achieved after the process, improve handling

C16 Timber v C24 Timber, what is the difference?

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.

Quality & 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 muscle? C24's your champion, ideal for heavy-duty projects like beams or load-bearing walls. C16, while sturdy, works best for less demanding tasks like stud walls or internal structures.

Don't forget:

Both grades are durable 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

7 x 3 Timber C24 is visually graded and is therefore a higher quality product.

Owing to increasing demand, most areas of the UK will now supply C24 graded timber. In some regions though, 7 x 3 C16 timber will be supplied. If you have a specific requirement, please check before buying.

What is 7 x 3 Timber used for?

C24 7x3 timber offers impressive tensile strength, perfect for structural applications such as:

• Wall framing

• Timber rafters

• Roof joists

• Floor joists

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

If you need to know more about 7x3 rough sawn timber, we have great timber for roofing blog.

If you're planning on using 3x7 timber for 175mm 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 175 timber?

Sizes listed in the drop-down menu are:

• 7x3 timber 2.4m
• 7x3 timber 3m
• 7x3 timber 3.6m
• 7x3 timber 4.2m
• 7x3 timber 4.8m
• 7x3 timber 5.4m
• 7x3 timber 6m

**Please note, this section size of timber is not available in all areas of the UK. Also, all sizes in the menu may not be available even if 7 x 3 timber is a stock item. It would be worthwhile to contact us before making a purchase to ensure your requirements can be supplied**

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

3 x 7 timber in mm is considered to be 75 x 175mm but as previously mentioned the actual size C16/C24 Timber supplied would finish around 70 x 170mm.

Don't want timber 7x3? Buildershop can help with your timber supplies in most sizes and grades across the whole UK. By clicking on the C16 Kiln Dried Graded Timber, you'll see the most common sizes. If you require for the timber to be treated, we also have this available in the C16 Kiln Dried Graded Timber - Treated. If you have a requirement not listed on our website, please get in touch and we'll be happy to try and help.