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6x3 Timber

Our robust 6x3 timber is perfect for heavy-duty construction, offering excellent strength for structural frameworks, beams and load-bearing applications.

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  • C24%2070x145%20Main.jpg.jpeg C24%2070x145%20Top%20Angle.jpg.jpeg

    C24 Timber Joists Untreated Kiln Dried Regularised PEFC 75 x 150mm (6x3)

    £9.64 - £55.45 per piece (Ex VAT)
    £11.57 - £66.54 per piece (Inc VAT)
    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. C24 is a premium product as the wood is slower grown and is also denser. Higher...
    £9.64 - £55.45 per piece (Ex VAT)
    £11.57 - £66.54 per piece (Inc VAT)
  • C24%2070x145%20Main.jpg.jpeg C24%2070x145%20Top%20Angle.jpg.jpeg

    C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 75 x 150mm (6x3)

    £10.38 - £59.70 per piece (Ex VAT)
    £12.46 - £71.64 per piece (Inc VAT)
    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. C24 is a premium product as the wood is slower grown and is also denser. Higher...
    £10.38 - £59.70 per piece (Ex VAT)
    £12.46 - £71.64 per piece (Inc VAT)
  • C24%2070x145%20Main.jpg.jpeg C24%2070x145%20Top.jpg.jpeg

    C16 Timber Joists Untreated Kiln Dried Regularised FSC 75 x 150mm (6x3)

    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. C24 is a premium product as the wood is slower grown and is also denser. Higher...
  • C24%2070x145%20Main.jpg.jpeg C24%2070x145%20Top%20Angle.jpg.jpeg

    C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 75 x 150mm (6x3)

    £10.38 - £59.70 per piece (Ex VAT)
    £12.46 - £71.64 per piece (Inc VAT)
    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. C24 is a premium product as the wood is slower grown and is also denser. Higher...
    £10.38 - £59.70 per piece (Ex VAT)
    £12.46 - £71.64 per piece (Inc VAT)
  • C24%2070x145%20Treated%20Main.jpg.jpeg C24%2070x145%20Treated%20Top.jpg.jpeg

    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 75 x 150mm (6x3)

    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. C24 is a premium product as the wood is slower grown and is also denser. Higher...
  • C24%2070x145%20Main.jpg.jpeg C24%2070x145%20Top.jpg.jpeg

    C24 Timber Joists Untreated Kiln Dried Regularised FSC 75 x 150mm (6x3)

    £9.64 - £55.45 per piece (Ex VAT)
    £11.57 - £66.54 per piece (Inc VAT)
    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. However, this C16 timber is imported into the UK and therefore comes from is slow...
    £9.64 - £55.45 per piece (Ex VAT)
    £11.57 - £66.54 per piece (Inc VAT)

Whether you’re working on a large-scale build or a demanding DIY project, 6x3 treated timber provides the durability and reliability you need. Ideal for both internal and external use, it's a trusted choice for professional tradespeople and home renovators alike.

Our range includes both 6x3 C24 timber and C16 options.

Why choose 6x3 timber?

6x3 timber (approximately 75mm x 150mm) is designed for situations where extra width and strength are required. Common uses include:

  • Roof joists and rafters
  • Flooring and decking supports
  • Large structural frames

    • Treated timber for outdoor use

    For projects exposed to moisture or outdoor conditions, our 6x3 timber is pressure-treated to resist rot, decay and insect damage, ensuring long-lasting durability for garden structures, decking or outdoor frames.