Sawn Treated Timber 4x2 (47x100mm) – C24 Pressure-Treated Structural

Our 4x2 sawn treated timber has a nominal sawn size of 47 x 100mm and is supplied in C24 grade, pressure-treated softwood, in lengths from 2.4m to 4.8m. Ideal for load-bearing joists, structural spans and heavier construction, with a 3-5 working day lead time to mainland UK.

Technical Specification

Common Uses

4x2 sawn treated timber is widely used for load-bearing joists, structural spans and heavier construction, along with decking frames, fencing, sheds, raised beds, pergolas and general garden and construction projects.

C24 Strength Grade

C24 is a higher-strength structural grade with fewer knots and superior load-bearing performance, ideal for joists, rafters and structural spans where greater strength is required.

Pressure Treatment

This timber is pressure-treated with a deep preservative that helps protect against rot, insect attack and fungal decay, making it suitable for outdoor and exposed use. Treat freshly cut ends with a suitable end-grain preserver to maintain protection.

Finish

Supplied rough sawn for a natural, rustic finish. As a natural product, timber may show variation in colour, grain, knots and moisture content, which is normal for sawn treated softwood.

Delivery Information

Lead times are currently 3-5 working days to mainland UK addresses. Longer lengths are bulky items, so suitable delivery access is required.

Frequently Asked Questions

What is 4x2 timber used for?
4x2 timber (47x100mm) in C24 grade is used for joists, rafters, lintels and structural frames. It is one of the most commonly specified timber sizes in UK construction.

What does C24 graded mean?
C24 is a structural strength grade under BS EN 338. C24 is the standard structural grade specified for load-bearing work in the UK — stronger than C16 and required for floor joists, roof rafters and structural frames.

Is 4x2 timber pressure treated?
Yes. All our sawn treated timber is pressure-treated with preservative under high vacuum, forcing the treatment deep into the wood fibres. This protects against rot, fungal decay and insect attack for 15-25+ years depending on exposure. Suitable for outdoor and in-ground use.

What is the surface finish of 4x2 timber?
This timber is rough-sawn with square edges — the standard for structural work where surface finish is not visible. For a planed finish, consider CLS studwork timber.

What lengths are available for 4x2 timber?
Check the variant options on the product page for the specific lengths available. Standard lengths are typically 2.4m, 3.0m, 3.6m and 4.8m depending on the section size.