Description

3.6m x 200mm x 47mm C24 Structural Timber – Pressure Treated

Strong, treated timber ideal for decking frames, joists, and garden structures

This 3.6m x 200mm x 47mm structural timber is C24-graded, kiln-dried, and pressure treated for strength, straightness, and long-term performance. A versatile choice for structural outdoor projects, this section is commonly used in decking subframes, floor joists, roof work, and garden construction where high load-bearing capability and durability are required.

The timber is planed with eased edges and is suitable for both trade and DIY use. If you’re building a timber frame deck, we recommend pairing this size with our full range of decking boards and using protection materials like Joist Flashing Tape to maximise longevity.

Specifications

• Size: 3.6m (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

A top choice for raised decking frames. Combine with ForgeFast Timber Screws for secure fixings and Joist Flashing Tape to reduce water damage to your subframe.

Garden Structures

Great for structural elements of pergolas, outdoor offices, and shed bases, offering a solid and treated alternative to untreated building timber.

Roofing & Flooring

Ideal for smaller span joists and structural floor use, delivering consistent strength thanks to C24 grading.

Materials related to “C24 Structural Timber”

• Decking Boards – Pair with subframe-grade timber

• Joist Flashing Tape – Protects top of joists from rot

• ForgeFast Timber Screws – Torx-compatible screws for structural fixing

• Sleepers – Great for raised beds or edging to complement timber builds

• Roofing Timber & Ply – Match with roofing components

• Full C24 Range – Browse other sizes

What’s the difference between C24 and C16 timber?

If you’re unsure what C24 means or whether it’s worth the upgrade from C16, check out our blog:
What is C24 Timber? C24 vs C16 Explained – Clear breakdown of strength, span, and usage recommendations.

How do you install C24 structural timber?

When used in decking or flooring, ensure a stable level base. Fix using ForgeFast Timber Screws and protect exposed joist tops with Joist Flashing Tape to prolong service life and improve water resistance.