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Rough Sawn Timber

Rough Sawn Timber is also referred to as carcassing timber.  It is used to create floor joists and timber framing in structural applications. Usually rough sawn timber comes in 3 different types of grading: C16 timber, C24 Timber and part graded timber.

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  • C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 70 x 95mm C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 70 x 95mm

    C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 70 x 95mm

    £6.26 - £35.98 per piece (Ex VAT)
    £7.51 - £43.18 per piece (Inc VAT)
    Imported Treated C24 Graded KD Timber Regularised Carcassing is a high-quality imported whitewood that's commonly used for interior construction i.e., stud walls, roof, and floor joists. The use of C24 grade timber, which has a smaller cross section,...
    £6.26 - £35.98 per piece (Ex VAT)
    £7.51 - £43.18 per piece (Inc VAT)
  • C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 70 x 195mm C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 70 x 195mm

    C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 70 x 195mm

    £12.51 - £71.96 per piece (Ex VAT)
    £15.01 - £86.35 per piece (Inc VAT)
    Imported Treated C16/C24 Graded KD Timber Regularised Carcassing is a high-quality imported whitewood that's commonly used for interior construction i.e., stud walls, roof, and floor joists. It is machined to have rounded edges, smooth faces, and sides,...
    £12.51 - £71.96 per piece (Ex VAT)
    £15.01 - £86.35 per piece (Inc VAT)
  • C16 Timber Joists Untreated Kiln Dried Regularised FSC 44 x 120mm C16 Timber Joists Untreated Kiln Dried Regularised FSC 44 x 120mm

    C16 Timber Joists Untreated Kiln Dried Regularised FSC 44 x 120mm

    £4.23 - £23.12 per piece (Ex VAT)
    £5.08 - £27.74 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...
    £4.23 - £23.12 per piece (Ex VAT)
    £5.08 - £27.74 per piece (Inc VAT)
  • C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 44 x 220mm C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 44 x 220mm

    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 44 x 220mm

    £8.03 - £46.15 per piece (Ex VAT)
    £9.64 - £55.38 per piece (Inc VAT)
    Treated timber is suitable to be used externally and is suitable for wet areas or areas where the timber will be coming into contact with the ground. Examples of treated timber uses are outdoor decking, shed bases, posts, sleepers. Regularised timber has...
    £8.03 - £46.15 per piece (Ex VAT)
    £9.64 - £55.38 per piece (Inc VAT)
  • C16 Timber Joists Untreated Kiln Dried Regularised FSC 72 x 145mm C16 Timber Joists Untreated Kiln Dried Regularised FSC 72 x 145mm

    C16 Timber Joists Untreated Kiln Dried Regularised FSC 72 x 145mm

    £7.70 - £44.27 per piece (Ex VAT)
    £9.24 - £53.12 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...
    £7.70 - £44.27 per piece (Ex VAT)
    £9.24 - £53.12 per piece (Inc VAT)
  • C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 70 x 145mm C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 70 x 145mm

    C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 70 x 145mm

    £9.39 - £53.97 per piece (Ex VAT)
    £11.27 - £64.76 per piece (Inc VAT)
    Imported Treated C24 Graded KD Timber Regularised Carcassing is a high-quality imported whitewood that's commonly used for interior construction i.e., stud walls, roof, and floor joists. The use of C24 grade timber, which has a smaller cross section,...
    £9.39 - £53.97 per piece (Ex VAT)
    £11.27 - £64.76 per piece (Inc VAT)
  • C16 Timber Joists Untreated Kiln Dried Regularised FSC 72 x 170mm C16 Timber Joists Untreated Kiln Dried Regularised FSC 72 x 170mm

    C16 Timber Joists Untreated Kiln Dried Regularised FSC 72 x 170mm

    £8.98 - £51.65 per piece (Ex VAT)
    £10.78 - £61.98 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...
    £8.98 - £51.65 per piece (Ex VAT)
    £10.78 - £61.98 per piece (Inc VAT)
  • C16 Timber Joists Untreated Kiln Dried Regularised FSC 44 x 220mm C16 Timber Joists Untreated Kiln Dried Regularised FSC 44 x 220mm

    C16 Timber Joists Untreated Kiln Dried Regularised FSC 44 x 220mm

    £7.24 - £41.61 per piece (Ex VAT)
    £8.69 - £49.93 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...
    £7.24 - £41.61 per piece (Ex VAT)
    £8.69 - £49.93 per piece (Inc VAT)
  • C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 70 x 95mm C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 70 x 95mm

    C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 70 x 95mm

    £6.26 - £35.98 per piece (Ex VAT)
    £7.51 - £43.18 per piece (Inc VAT)
    Imported Treated C16/C24 Graded KD Timber Regularised Carcassing is a high-quality imported whitewood that's commonly used for interior construction i.e., stud walls, roof, and floor joists. It is machined to have rounded edges, smooth faces, and sides,...
    £6.26 - £35.98 per piece (Ex VAT)
    £7.51 - £43.18 per piece (Inc VAT)
  • C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 70 x 145mm C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 70 x 145mm

    C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 70 x 145mm

    £9.58 - £53.97 per piece (Ex VAT)
    £11.50 - £64.76 per piece (Inc VAT)
    Treated C24 is a structural timber that's commonly used for stud walls, roof and floor joists, and structural joinery. The use of C24 grade timber, which has a smaller cross section, allows for higher loads, and longer spans. C24 grade has fewer...
    £9.58 - £53.97 per piece (Ex VAT)
    £11.50 - £64.76 per piece (Inc VAT)
  • C16 Timber Joists Kiln Dried Regularised FSC 70 x 145mm C16 Timber Joists Kiln Dried Regularised FSC 70 x 145mm

    C16 Timber Joists Kiln Dried Regularised FSC 70 x 145mm

    £8.84 - £49.72 per piece (Ex VAT)
    £10.61 - £59.66 per piece (Inc VAT)
    C16 graded carcassing is a structural timber commonly used for stud walls, roof and floor joists, and structural joinery. C16 is normally the grade that is produced from faster grown UK timber. It is machined to have rounded edges, smooth faces, and...
    £8.84 - £49.72 per piece (Ex VAT)
    £10.61 - £59.66 per piece (Inc VAT)
  • C16 Timber Joists Kiln Dried Regularised PEFC 44 x 70mm C16 Timber Joists Kiln Dried Regularised PEFC 44 x 70mm

    C16 Timber Joists Kiln Dried Regularised PEFC 44 x 70mm

    £2.77 - £15.58 per piece (Ex VAT)
    £3.32 - £18.70 per piece (Inc VAT)
    C16 graded carcassing is a structural timber commonly used for stud walls, roof and floor joists, and structural joinery. C16 is normally the grade that is produced from faster grown UK timber. It is machined to have rounded edges, smooth faces, and...
    £2.77 - £15.58 per piece (Ex VAT)
    £3.32 - £18.70 per piece (Inc VAT)
  • C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 44 x 170mm C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 44 x 170mm

    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 44 x 170mm

    £6.54 - £35.89 per piece (Ex VAT)
    £7.85 - £43.07 per piece (Inc VAT)
    Treated timber is suitable to be used externally and is suitable for wet areas or areas where the timber will be coming into contact with the ground. Examples of treated timber uses are outdoor decking, shed bases, posts, sleepers. Regularised timber has...
    £6.54 - £35.89 per piece (Ex VAT)
    £7.85 - £43.07 per piece (Inc VAT)
  • C16 Timber Joists Kiln Dried Regularised FSC 44 x 170mm C16 Timber Joists Kiln Dried Regularised FSC 44 x 170mm

    C16 Timber Joists Kiln Dried Regularised FSC 44 x 170mm

    £6.32 - £36.35 per piece (Ex VAT)
    £7.58 - £43.62 per piece (Inc VAT)
    C16 graded carcassing is a structural timber commonly used for stud walls, roof and floor joists, and structural joinery. C16 is normally the grade that is produced from faster grown UK timber. It is machined to have rounded edges, smooth faces, and...
    £6.32 - £36.35 per piece (Ex VAT)
    £7.58 - £43.62 per piece (Inc VAT)
  • C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 70 x 220mm C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 70 x 220mm

    C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 70 x 220mm

    £14.08 - £80.95 per piece (Ex VAT)
    £16.90 - £97.14 per piece (Inc VAT)
    Imported Treated C16/C24 Graded KD Timber Regularised Carcassing is a high-quality imported whitewood that's commonly used for interior construction i.e., stud walls, roof, and floor joists. It is machined to have rounded edges, smooth faces, and sides,...
    £14.08 - £80.95 per piece (Ex VAT)
    £16.90 - £97.14 per piece (Inc VAT)
  • C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 70 x 195mm C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 70 x 195mm

    C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 70 x 195mm

    £12.51 - £71.96 per piece (Ex VAT)
    £15.01 - £86.35 per piece (Inc VAT)
    Treated C24 is a structural timber that's commonly used for stud walls, roof and floor joists, and structural joinery. The use of C24 grade timber, which has a smaller cross section, allows for higher loads, and longer spans. C24 grade has fewer...
    £12.51 - £71.96 per piece (Ex VAT)
    £15.01 - £86.35 per piece (Inc VAT)
  • C16 Timber Joists Kiln Dried Regularised FSC 44 x 220mm C16 Timber Joists Kiln Dried Regularised FSC 44 x 220mm

    C16 Timber Joists Kiln Dried Regularised FSC 44 x 220mm

    £8.31 - £46.74 per piece (Ex VAT)
    £9.97 - £56.09 per piece (Inc VAT)
    C16 graded carcassing is a structural timber commonly used for stud walls, roof and floor joists, and structural joinery. C16 is normally the grade that is produced from faster grown UK timber. It is machined to have rounded edges, smooth faces, and...
    £8.31 - £46.74 per piece (Ex VAT)
    £9.97 - £56.09 per piece (Inc VAT)
  • C16 Timber Joists Kiln Dried Regularised FSC 44 x 245mm C16 Timber Joists Kiln Dried Regularised FSC 44 x 245mm

    C16 Timber Joists Kiln Dried Regularised FSC 44 x 245mm

    £9.23 - £51.93 per piece (Ex VAT)
    £11.08 - £62.32 per piece (Inc VAT)
    C16 graded carcassing is a structural timber commonly used for stud walls, roof and floor joists, and structural joinery. C16 is normally the grade that is produced from faster grown UK timber. It is machined to have rounded edges, smooth faces, and...
    £9.23 - £51.93 per piece (Ex VAT)
    £11.08 - £62.32 per piece (Inc VAT)
  • C16 Timber Joists Kiln Dried Regularised FSC 70 x 220mm C16 Timber Joists Kiln Dried Regularised FSC 70 x 220mm

    C16 Timber Joists Kiln Dried Regularised FSC 70 x 220mm

    £12.97 - £74.58 per piece (Ex VAT)
    £15.56 - £89.50 per piece (Inc VAT)
    C16 graded carcassing is a structural timber commonly used for stud walls, roof and floor joists, and structural joinery. C16 is normally the grade that is produced from faster grown UK timber. It is machined to have rounded edges, smooth faces, and...
    £12.97 - £74.58 per piece (Ex VAT)
    £15.56 - £89.50 per piece (Inc VAT)
  • C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 44 x 220mm C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 44 x 220mm

    C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 44 x 220mm

    £8.82 - £50.73 per piece (Ex VAT)
    £10.58 - £60.88 per piece (Inc VAT)
    Treated C24 is a structural timber that's commonly used for stud walls, roof and floor joists, and structural joinery. The use of C24 grade timber, which has a smaller cross section, allows for higher loads, and longer spans. C24 grade has fewer...
    £8.82 - £50.73 per piece (Ex VAT)
    £10.58 - £60.88 per piece (Inc VAT)
  • C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 44 x 245mm C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 44 x 245mm

    C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 44 x 245mm

    £10.00 - £56.37 per piece (Ex VAT)
    £12.00 - £67.64 per piece (Inc VAT)
    Treated C24 is a structural timber that's commonly used for stud walls, roof and floor joists, and structural joinery. The use of C24 grade timber, which has a smaller cross section, allows for higher loads, and longer spans. C24 grade has fewer...
    £10.00 - £56.37 per piece (Ex VAT)
    £12.00 - £67.64 per piece (Inc VAT)
  • C24 Timber Joists Untreated Regularised PEFC 97 x 197mm C24 Timber Joists Untreated Regularised PEFC 97 x 197mm

    C24 Timber Joists Untreated Regularised PEFC 97 x 197mm

    £25.97 - £149.32 per piece (Ex VAT)
    £31.16 - £179.18 per piece (Inc VAT)
    Carcassing is a generic trade term which refers to the use of a species of timber. Spruce/Pine and Fir are used to form floors, walls, ceilings and roofs of properties for example.
    £25.97 - £149.32 per piece (Ex VAT)
    £31.16 - £179.18 per piece (Inc VAT)
  • Rough Sawn Timber UC2 Treated Kiln Dried Regularlised FSC 45 x 45mm Rough Sawn Timber UC2 Treated Kiln Dried Regularlised FSC 45 x 45mm

    Rough Sawn Timber UC2 Treated Kiln Dried Regularlised FSC 45 x 45mm

    £2.03 - £11.47 per piece (Ex VAT)
    £2.44 - £13.76 per piece (Inc VAT)
    The sawn treated carcassing has a rough sawn finish, which is pressure treated to prolong timbers lifespan and protect rot or insect attack. This non- structural softwood is ideal for construction and landscaping projects.
    £2.03 - £11.47 per piece (Ex VAT)
    £2.44 - £13.76 per piece (Inc VAT)
  • Scaffold Board Timber Banded Both Ends PEFC 36 x 225mm Scaffold Board Timber Banded Both Ends PEFC 36 x 225mm

    Scaffold Board Timber Banded Both Ends PEFC 36 x 225mm

    £20.95 - £28.86 each (Ex VAT)
    £25.14 - £34.63 each (Inc VAT)
    Our 38 x 225 Scaffold Board, are timber planks that are perfect for access platforms and walkways are straight and sturdy with a steel band on both ends. This board is made from responsibly sourced wood that is PEFC Certified and holds a Full chain of...
    £20.95 - £28.86 each (Ex VAT)
    £25.14 - £34.63 each (Inc VAT)

Rough Sawn Timber

What is Structural Carcassing Timber?

Often referred to as carcassing timber, this type of wood is most commonly used in structural applications that involve the timber being used in an area that won’t be seen, and typically comes in three gradings:

  • C16 Timber
  • C24 Timber
  • Part Graded Timber

Do I need Treated Structural Timber?

If the timber is going to be placed in an area where attacks from external problems such as moisture or fungal attacks, are likely to cause major problems, then we strongly recommend purchasing treated structural timber.

For all the following applications, we generally recommend using a treated structural timber:

  • Roof Rafters
  • Timber Framing
  • Ceiling Joists
  • Floor Joists
  • Deck Joists

I need a Sawn Finish Structural Timber

Sawn Carcassing Timber has largely been replaced in UK stockists with “eased edge” stock being introduced in the UK in 2004.

Eased Edged means that the timber is semi-surfaced and finished to a uniform finish that is relatively smooth. Four corners are radiused to reduce the likelihood of splinters.

Most of our branches do hold stock of sawn boards that are either treated or untreated. However, if you require a sawn unsurfaced finish, please contact your nearest branch, who will be able to source this as a special item to meet your requirements. Most sizes can be obtained within 5 to 10 working days.

Confused about C16 and C24 structural timber and which grade you will need? Your nearest branch will be more than happy to help.

Frequently Asked Questions

What is the difference between each type ie C16, C24 and part graded timber?
All graded timbers are slow-grown and kiln-dried so that there is no more than 20% of moisture in the wood. This is in keeping with relevant building regulations, as the kiln-drying process creates a timber that is incredibly strong, guaranteeing stability.
What is C16 Timber?
C16 graded structural timber is the most cost-effective option and meets performance requirements. Kiln dried C16 is generally recommended for most applications if the correct spans are used and is mainly used internally for floor and roof joists. Lengths commonly available are 3.0, 3.6, 4.2 and 4.8 meter.
What is C24 Timber?
C24 graded premium structural timber offers greater strength than C16 timber, making it a more demanding grade that can handle higher loads and wider spans. It is the better-quality structural option because it can take up to 50% longer for these timbers to grow, meaning that they have more growth rings. The more growth rings a piece of wood has, the higher its overall density, which in turn means that it has greater natural durability and improved stability. The tighter the growth rings of the wood, the better-quality piece of wood that you are dealing with.

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