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125 x 47mm (5x2) Treated Timber Joist | C16 / C24 Regularised

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Original price £17.90
Original price £17.90 - Original price £17.90
Original price £17.90
£7.62 - £13.70
£7.62 - £13.70
Current price £7.62

Our 125 x 47mm (5x2) treated timber joists are strong, reliable, and versatile — ideal for structural applications including decking frames, floor joists, studwork, and roof construction. Available in both C16 and C24 strength grades, these regularised timbers are planed all round (PAR) with eased edges for consistency and ease of handling.

Nominal size: 125mm x 47mm (5" x 2")
Finished size (regularised): approx. 120mm x 45mm
✅ Available in 3.6m and 4.8m lengths
✅ Choose from C16 (standard grade) or C24 (higher strength, fewer knots)
Kiln-dried for stability
Pressure-treated for resistance to rot, decay, and insect attack
✅ Ideal for internal and external use

C24-grade timber provides improved strength and is ideal where greater structural performance is required — especially for decking or roofing projects with wider spans.


🛠️ Common Applications:

  • Decking subframes and platforms

  • Roof rafters and structural framing

  • Garden rooms, sheds & timber outbuildings

  • Flooring and ceiling joist systems

✔️ Structural-grade, treated softwood
✔️ Available in single lengths or bulk trade packs
✔️Nationwide delivery available

Dave Terrey
May, 2025
Great team, very helpful. Completed 16m of fencing in one day. Worked methodically to complete the fence which included three staggered sections with minimal disruption and cleared all debris. Great price too! Would highly recommend.
Marc Scott
April, 2025
Very handy having such a well stocked yard so close to my home, the staff are all very knowledgable and always keen to help and prices are good. ⭐️⭐️⭐️⭐️⭐️ operation 👌. - scotbeds
Ryan McGowan
March, 2025
sales girl Leighsa was really helpful with fast delivery