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

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

Product Code: T026
Reward Points: 10
Price: £11.40
Ex Tax: £9.50
Price in reward points: 950

Available Options

* Timber Lengths:


4x3 Timber C16/C24 Grade

Also referred to as 4 x 3 wood or 3 x 4 timber, this relates to the old imperial sizes of 3 inch by 4 inch and 4 inch by 3 inch. Sold by the stated nominal size of 75 x 100mm, the actual finished size of the sawn carcassing timber is around 70 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.


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.


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 3 C16 timber will be supplied. If you have a critical requirement, please check before buying.

What is 4 x 3 Timber used for?

The most common use would be as a timber wall plate. This is fixed with Restraint Straps to the masonry so the roof timbers can be fixed in place. It is also perfect for applications such as:

• Stud walling

• Timber rafters

• Roof joists

• Heavy duty furniture building

If you need to know more about 4x3 sawn timber, we have great timber for roofing blog.

What lengths are available in 75 x 100 timber?

Sizes listed in the drop-down menu are:

• 4x3 timber 2.4m
• 4x3 timber 3m
• 4x3 timber 3.6m
• 4x3 timber 4.2m
• 4x3 timber 4.8m
• 4x3 timber 5.4m
• 4x3 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.

3 x 4 timber in mm is considered to be 75 x 100mm but as previously mentioned the actual size C16 Timber supplied would finish around 70 x 95mm.

Don't want timber 4x3? For 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, you'll see the most common sizes. Need your 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.

For full details of delivery charges, returns, colour variations, and discounts please see our delivery & returns policy.

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