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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%2070x170%20Main.jpg.jpeg C24%2070x170%20Top%20Angle.jpg.jpeg

    C24 Timber Joists Untreated Kiln Dried Regularised FSC 75 x 175mm (7x3)

    £23.48 - £67.49 per piece (Ex VAT)
    £28.18 - £80.99 per piece (Inc VAT)
    It is machined to have rounded edges, smooth faces, and sides, for a more uniform piece of timber. It is kiln dried to minimise moisture content and improve strength and stability. The finished size you will receive is 70mm x 170mm. C16 and C24 are...
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    Green Treated Timber Fence Post 4-Way Diamond Top UC3u FSC 200 x 200 x 2400mm

    Green treated timber 4-way diamond top fence post 200 x 200 x 2400mm UC3u FSC certified for fencing projects. Buy online today.
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    Accoya A1 Grade Rough Sawn Timber Kiln Dried FSC 25 x 125mm (5")

    £137.88 - £396.41 per piece (Ex VAT)
    £165.46 - £475.69 per piece (Inc VAT)
    High Performance Accoya is an exceptional high-performance, eco-friendly wood known for its remarkable durability and stability. Through its non-toxic acetylation treatment, Accoya outperforms even the best tropical hardwoods, offering long-lasting...
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    Accoya A1 Grade Rough Sawn Timber Kiln Dried FSC 25 x 150mm (6")

    £128.59 - £369.70 per piece (Ex VAT)
    £154.31 - £443.64 per piece (Inc VAT)
    High Performance Accoya is an exceptional high-performance, eco-friendly wood known for its remarkable durability and stability. Through its non-toxic acetylation treatment, Accoya outperforms even the best tropical hardwoods, offering long-lasting...
  • Accoya%20-%20Photo%20produit%20%288%29.png 191128_accsys_2922.jpg.jpeg

    Accoya A1 Grade Rough Sawn Timber Kiln Dried FSC 38 x 200mm (8")

    £137.88 - £396.41 per piece (Ex VAT)
    £165.46 - £475.69 per piece (Inc VAT)
    High Performance Accoya is an exceptional high-performance, eco-friendly wood known for its remarkable durability and stability. Through its non-toxic acetylation treatment, Accoya outperforms even the best tropical hardwoods, offering long-lasting...
  • Accoya%20-%20Photo%20produit%20%288%29.png 191128_accsys_2922.jpg.jpeg

    Accoya A1 Grade Rough Sawn Timber Kiln Dried FSC 50 x 100mm (2")

    £128.59 - £369.70 per piece (Ex VAT)
    £154.31 - £443.64 per piece (Inc VAT)
    High Performance Accoya is an exceptional high-performance, eco-friendly wood known for its remarkable durability and stability. Through its non-toxic acetylation treatment, Accoya outperforms even the best tropical hardwoods, offering long-lasting...
  • Accoya%20-%20Photo%20produit%20%288%29.png 191128_accsys_2922.jpg.jpeg

    Accoya A1 Grade Rough Sawn Timber Kiln Dried FSC 50 x 125mm (5")

    £128.59 - £369.70 per piece (Ex VAT)
    £154.31 - £443.64 per piece (Inc VAT)
    High Performance Accoya is an exceptional high-performance, eco-friendly wood known for its remarkable durability and stability. Through its non-toxic acetylation treatment, Accoya outperforms even the best tropical hardwoods, offering long-lasting...
  • Accoya%20-%20Photo%20produit%20%288%29.png 191128_accsys_2922.jpg.jpeg

    Accoya A1 Grade Rough Sawn Timber Kiln Dried FSC 50 x 150mm (6")

    £137.88 - £396.41 per piece (Ex VAT)
    £165.46 - £475.69 per piece (Inc VAT)
    High Performance Accoya is an exceptional high-performance, eco-friendly wood known for its remarkable durability and stability. Through its non-toxic acetylation treatment, Accoya outperforms even the best tropical hardwoods, offering long-lasting...
  • Accoya%20-%20Photo%20produit%20%288%29.png 191128_accsys_2922.jpg.jpeg

    Accoya A1 Grade Rough Sawn Timber Kiln Dried FSC 50 x 200mm (8")

    £128.59 - £369.70 per piece (Ex VAT)
    £154.31 - £443.64 per piece (Inc VAT)
    High Performance Accoya is an exceptional high-performance, eco-friendly wood known for its remarkable durability and stability. Through its non-toxic acetylation treatment, Accoya outperforms even the best tropical hardwoods, offering long-lasting...
  • Accoya%20-%20Photo%20produit%20%288%29.png 191128_accsys_2922.jpg.jpeg

    Accoya A1 Grade Rough Sawn Timber Kiln Dried FSC 63 x 150mm (6")

    £128.59 - £369.70 per piece (Ex VAT)
    £154.31 - £443.64 per piece (Inc VAT)
    High Performance Accoya is an exceptional high-performance, eco-friendly wood known for its remarkable durability and stability. Through its non-toxic acetylation treatment, Accoya outperforms even the best tropical hardwoods, offering long-lasting...
  • Accoya%20-%20Photo%20produit%20%288%29.png 191128_accsys_2922.jpg.jpeg

    Accoya A1 Grade Rough Sawn Timber Kiln Dried FSC 75 x 100mm (4")

    £66.05 - £189.89 per piece (Ex VAT)
    £79.26 - £227.87 per piece (Inc VAT)
    High Performance Accoya is an exceptional high-performance, eco-friendly wood known for its remarkable durability and stability. Through its non-toxic acetylation treatment, Accoya outperforms even the best tropical hardwoods, offering long-lasting...
  • Accoya%20-%20Photo%20produit%20%288%29.png 191128_accsys_2922.jpg.jpeg

    Accoya A1 Grade Rough Sawn Timber Kiln Dried FSC 75 x 150mm (6")

    £99.07 - £284.83 per piece (Ex VAT)
    £118.88 - £341.80 per piece (Inc VAT)
    High Performance Accoya is an exceptional high-performance, eco-friendly wood known for its remarkable durability and stability. Through its non-toxic acetylation treatment, Accoya outperforms even the best tropical hardwoods, offering long-lasting...
  • Accoya%20-%20Photo%20produit%20%288%29.png 191128_accsys_2922.jpg.jpeg

    Accoya A1 Grade Rough Sawn Timber Kiln Dried FSC 75 x 200mm (8")

    £156.19 - £449.04 per piece (Ex VAT)
    £187.43 - £538.85 per piece (Inc VAT)
    FSC certified Accoya rough sawn timber, kiln dried for outstanding durability and stability in external projects. Buy online or Click & Collect today.
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 75 x 200mm (8x3)

    These C16 carcassing timber lengths are UC3u treated timber, meaning they perfect for outdoor use providing it is above ground. Carcassing is a generic trade term which refers to the use of a species of timber. Spruce/Pine and Fir are used to form...
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 75 x 225mm (9x3)

    These C16 carcassing timber lengths are UC3u treated timber, meaning they perfect for outdoor use providing it is above ground. Carcassing is a generic trade term which refers to the use of a species of timber. Spruce/Pine and Fir are used to form...
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    C24 Timber Joists Untreated Kiln Dried Regularised PEFC 75 x 175mm (7x3)

    Kiln dried C24 untreated timber joist, regularised and PEFC certified for structural building applications. Buy online or Click & Collect today.
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    C24 Timber Joists Untreated Kiln Dried Regularised PEFC Premium Length 75 x 175mm (7x3)

    Premium length C24 untreated timber joist, kiln dried and regularised for structural timber projects. Buy online with delivery or Click & Collect.
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    C24 Timber Joists Untreated Regularised PEFC 47 x 250mm (Finished Size 45x247mm)

    £21.56 - £62.00 per m3 (Ex VAT)
    £25.87 - £74.40 per m3 (Inc VAT)
    PEFC certified untreated C24 timber joist, regularised for consistent dimensions and structural use. Buy online with delivery or Click & Collect today.
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    Green Treated Timber Fence Post 4-Way Diamond Top Tanalised FSC 200 x 200 x 3000mm

    Green treated timber 4-way diamond top fence post 200 x 200 x 3000mm FSC certified for premium fencing and gate installations. Buy online today.
  • Rough Sawn Timber European Larch FSC 50 x 100mm

    £6.49 - £37.33 per m3 (Ex VAT)
    £7.79 - £44.80 per m3 (Inc VAT)
    FSC European larch rough sawn timber measuring 50 x 100mm for exterior timber projects. Buy online today.
  • Rough Sawn Timber European Larch FSC 50 x 150mm

    FSC European larch rough sawn timber measuring 50 x 150mm for cladding, landscaping and construction. Buy online today.
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    Rough Sawn Timber Joinery Redwood FSC 19 x 150mm

    FSC rough sawn redwood joinery timber measuring 19 x 150mm for interior and exterior timber work. Buy online today.
  • PSE%2044x144%20Main.jpg.jpeg interior-upm-timber-0948.jpg.jpeg

    Rough Sawn Timber Joinery Redwood FSC 47 x 150mm

    FSC rough sawn redwood joinery timber measuring 47 x 150mm for structural and joinery applications. Buy online today.
  • PSE%2044x144%20Main.jpg.jpeg interior-upm-timber-0948.jpg.jpeg

    Rough Sawn Timber Joinery Redwood FSC 50 x 125mm

    FSC rough sawn redwood joinery timber measuring 50 x 125mm for construction and joinery. Buy online today.

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.