Description

4.8m x 200mm x 47mm C24 Structural Timber – Pressure Treated

High-grade structural timber for joists, beams, and heavy-duty outdoor use

This 4.8m x 200mm x 47mm timber is C24-graded, kiln-dried, and pressure treated for durability, making it ideal for structural load-bearing applications both indoors and outdoors. Its strength and size make it a popular choice for decking subframes (see our full range of decking boards), floor joists, roof rafters, and garden structures.

The timber is planed with eased edges for safe handling and uniform sizing. The pressure treatment helps protect against fungal decay and insect attack, ensuring reliable performance in exposed settings.

Specifications

• Size: 4.8m (length) x 200mm (width) x 47mm (depth)

• Grade: C24 structural timber

• Finish: Kiln-dried and pressure treated

• Edge: Planed all round with eased edges

• Use: Indoor and outdoor structural use

Common Applications

Decking Subframes

Ideal for multi-level or raised decking installations. For added durability, use with ForgeFast Timber Screws for strong structural fixings and Joist Flashing Tape to protect joist tops from water ingress.

Roof Rafters & Joists

Used extensively in building projects for its strength and grading, C24 timber is suitable for both roofing and flooring structures.

Garden Structures

Perfect for building large pergolas, outbuildings, and frameworks where rigidity and treatment lifespan are crucial.

Materials related to “C24 Structural Timber”

• Decking Boards – Designed to pair with treated C24 timber frames

• Joist Flashing Tape – Protects top edges of timber joists from moisture

• ForgeFast Timber Screws – High-strength structural screws for timber framing

• Sleepers – For edging, retaining walls or decorative outdoor framing

• Roofing Timber & Ply – Compatible timber products for roofing use

• Full C24 Range – Explore more sizes and lengths

What’s the difference between C24 and C16 timber?

Want to understand the real value of C24 timber and why it’s worth the upgrade from C16?
Check out our blog: What is C24 Timber? C24 vs C16 Explained – where we break down structural strength, treatment, span performance, and where each grade is most suitable.

How do you install C24 structural timber for decking?

Use a level base or concrete pad system, and space your joists correctly depending on span requirements. Fix C24 timber with ForgeFast Timber Screws and apply Joist Flashing Tape to prolong lifespan and prevent moisture ingress from decking boards.