Skip to content
Mon - Fri 7.30am - 5.30pm, Saturday 7.30am - 12.30pm
Mon - Fri 7.30am - 5.30pm, Saturday 7.30am - 12.30pm

Related products

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

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

Save 57% Save 57%
£17.90
£17.90 - £17.90
£17.90
£7.62
£7.62 - £13.70
£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
Rating
Write a Review
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
D
March, 2025
Outstanding customer care. I placed a small order (60£ timber) from Fife and paid with Apple Pay. Unfortunately the site defaulted to their normal own delivery service which is for an unlimited volume so good value for larger orders, but would have been too expensive for a small order like mine. I hadn’t seen this until the order went through (entirely my fault). I had thought to cancel and the weekend office team were very kind and understanding about this. We agreed I would call them in the week to arrange this. But Alan and the Alter team phoned me back a day later and said they had researched courier costs and would be happy to do that instead - which saved a huge amount of hassle on a product that was out of stock in most places locally and made the whole order very reasonable. They also refunded me the difference. Way above and beyond for a small customer - can’t recommend them enough and will be using them for more timber needs in the future.
Show all Reviews