47 x 100mm Timber C16/C24 Graded Kiln Dried and Regged

4x2 Timber C16/C24 Grade

Also referred to as 4 x 2 wood or 2 x 4 timber, this relates to the old imperial sizes of 2 inch by 4 inch and 4 inch by 2 inch. Sold by the stated nominal size of 47 x 100mm, the actual finished size of the sawn carcassing timber is around 45 x 95mm but may vary slightly. The regularising (regged) process gives a finished edge that takes 2mm from nominal thickness and 5mm from the nominal width. Once this process has taken place the lengths have slightly rounded edges which makes handling easier.

What is the difference between C16 Timber and C24 Timber?

When load bearing and support is required, a stress graded carcassing timber must be used. This is where care must be taken to select the correct grade of timber.

Both C16 and C24 are kiln-dried softwood options, but understanding their differences is crucial for a successful project.

Strength & Quality:

Think of the grading system like a ranking. C24 takes the gold, boasting superior strength and a premium, near-flawless appearance. C16, the silver medalist, is still strong and reliable, but may have slight 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.

Remember:

Both choices are durable for construction. The key lies in matching the specific needs of your project with the strengths and characteristics of each grade.

Considerations 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

C24 is visually graded and is a better quality product.

Due to the increasing demand, most regions will now supply C24 graded timber. In some areas, 4 x 2 C16 timber will be supplied. If you have a critical requirement, please check before buying.

What is 4 x 2 Timber used for?

Don't underestimate its size. C24 timber offers impressive tensile strength, perfect for structural applications such as:

• Wall framing

• Stud walling

• Timber rafters

• Roof joists

• Floor joists

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

• Heavy duty furniture building

If you need to know more about 4x2 sawn timber, we have great timber for roofing blog.

If you're planning on using 2x4 timber for 100mm 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 47 x 100 timber?

Sizes listed in the drop-down menu are:

• 4x2 timber 2.4m
• 4x2 timber 3m
• 4x2 timber 3.6m
• 4x2 timber 4.2m
• 4x2 timber 4.8m
• 4x2 timber 5.4m
• 4x2 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 this is the case, you will be contacted within 1 working day to discuss the options.

2 x 4 timber in mm is considered to be 47 x 100mm but as previously mentioned the actual size C16 Timber supplied would finish around 45 x 95mm.

Don't want treated timber 4x2? For treated timber supplies across the whole of the UK, Buildershop can help source most sizes and grades. By clicking on the C16 Kiln Dried Graded Timber - Treated. you'll find all the other sizes we have listed. If you have a requirement that isn't listed on our website, please get in touch and we'll be happy to try and help.