Timber Decking Joists | Treated Joists for Garden Decking Frames

Shop our range of pressure-treated timber decking joists, ideal for building strong and long-lasting decking subframes. Designed to support softwood and composite decking boards, these structural timbers are treated for outdoor durability and ground contact.

✅ UC3-treated for exterior use
✅ Available in popular sizes: 47x100mm, 47x150mm, 47x200mm
✅ Ideal for ground-level and raised decking projects
✅ Compatible with all major decking board types
✅ Strong, stable, and easy to install

Perfect for garden decking frames, outdoor platforms, and step construction. Trusted by landscapers, joiners, and home DIYers across the UK. Nationwide delivery available on all decking joists and framing