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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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  • Special Offer
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    Special Offer

    C16 Timber Decking Joists UC4 Treated Brown Incised Kiln Dried Regularised FSC 47 x 100mm (4x2)

    These UC4 Treated Brown Incised Kiln Dried Regularised joists are the backbone of a durable and sustainable deck, offering exceptional support for your decking planks. Crafted from premium load bearing C16 graded conifer timber, including spruce and fir,...
  • Special Offer
    C16Brown%2044x145%20Main.jpg.jpeg C16Brown%2044x145%20Top%20Angle.jpg.jpeg
    Special Offer

    C16 Timber Decking Joists UC4 Treated Brown Incised Kiln Dried Regularised FSC 47 x 150mm (6x2)

    C16 deck joists are perfect for supporting your decking area, as they sit under your decking planks. This brown timber carcassing is UC4 treated, meaning that not only is it ideal for outdoor use, but it is also suitable for direct contact with the...
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    Rough Sawn Timber UC3u Treated Brown Unseasoned FSC 22 x 100mm

    £1.81 - £10.40 per piece (Ex VAT)
    £2.17 - £12.48 per piece (Inc VAT)
    UC3u Treatment Class Crafted from UC3u treated timber, these provide robust protection against rot and decay. Ideally suited for above-ground outdoor applications such as constructing pergolas and garden structures. UC3u is not recommended for a raised...
    £1.81 - £10.40 per piece (Ex VAT)
    £2.17 - £12.48 per piece (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.