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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%2070x95%20Main.jpg.jpeg C24%2070x95%20Top%20Angle.jpg.jpeg

    C16 Timber Joists Untreated Kiln Dried Regularised FSC 75 x 100mm (4x3)

    £5.84 - £33.57 per piece (Ex VAT)
    £7.01 - £40.28 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...
    £5.84 - £33.57 per piece (Ex VAT)
    £7.01 - £40.28 per piece (Inc VAT)
  • C24%2044x195%20Top.jpg.jpeg C24%2044x195%20Top%20Angle_.jpg.jpeg

    C24 Timber Joists Untreated Kiln Dried Regularised PEFC 47 x 200mm

    £7.72 - £44.39 per piece (Ex VAT)
    £9.26 - £53.27 per piece (Inc VAT)
    Discover the unparalleled strength and versatility of our C24-treated timber joists, designed specifically for demanding structural applications such as stud walls, roof and floor joists, and joinery projects. Engineered to outperform with a higher load...
    £7.72 - £44.39 per piece (Ex VAT)
    £9.26 - £53.27 per piece (Inc VAT)
  • Rough%20Treated%2019x38%20Main.jpg.jpeg Rough%20Treated%2019x38%20Top.jpg.jpeg

    Rough Sawn Timber UC2 Treated 19 x 38mm

    £0.69 - £3.99 per piece (Ex VAT)
    £0.83 - £4.79 per piece (Inc VAT)
    Ungraded timber means it is neither C16 nor C24 graded, it can only be used for non‑load‑bearing applications. This makes it ideal for general‑purpose uses such as shelving, boxing‑in, panelling, planters, compost bins, small tool stores, DIY joinery,...
    £0.69 - £3.99 per piece (Ex VAT)
    £0.83 - £4.79 per piece (Inc VAT)
  • ECC_C16.jpeg Ungraded-timber.jpg.jpeg

    Rough Sawn Timber Untreated 35 x 50mm

    <p>Ungraded timber means it is neither C16 nor C24 graded, it can only be used for non‑load‑bearing applications. This makes it ideal for general‑purpose uses such as shelving, boxing‑in, panelling, planters, compost bins, small tool stores, DIY...

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.