3×4 C24 Treated Timber (75×100) – Framing Joist (FK)

3×4 C24 Treated Timber (75×100) – Framing Joist is a premium structural softwood ideal for framing, decking, and load-bearing joist work. Each length is pressure-treated with a green preservative to resist rot, moisture, and fungal decay, ensuring strength and durability in all weather conditions.

Our 3×4 C24 Treated Timber is kiln-dried, planed, and regularised for consistent sizing with eased corners for smoother handling. The C24 grade provides superior strength compared to standard C16 timber, making it the preferred choice for builders and contractors who require reliable, high-performance timber for structural use.

This C24 treated joist is perfect for use in flooring, decking frames, garden structures, and other load-bearing applications. The green treatment penetrates deep into the timber, offering long-term protection against damp environments and outdoor exposure. Each piece is sourced responsibly to meet UK building standards and environmental requirements.

Browse our full range of timber supplies and building materials for complementary products. For detailed information on grading and treatment standards, visit the TRADA website.