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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

    C24 Timber Decking Joists UC4 Treated Kiln Dried Regularised Redwood 47 x 100 x 3600mm (4x2)

    Crafted for durability and strength, our C24 Timber Joists UC4 Treated Redwood 47x100x3600mm are the ideal choice for your outdoor decking projects. These joists are UC4 treated, ensuring they are well-suited for ground and water contact, making them...
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    C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 47 x 100mm (4x2)

    £4.11 - £23.63 per piece (Ex VAT)
    £4.93 - £28.36 per piece (Inc VAT)
    C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC timber is your go-to choice for robust structural applications. C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that...
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    C24 Timber Joists Untreated Kiln Dried Regularised PEFC 47 x 75mm (3x2)

    £2.85 - £16.39 per piece (Ex VAT)
    £3.42 - £19.67 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...
  • Special Offer
    C24%2044x145%20Treated%20Main.jpg.jpeg C24%2044x145%20Treated%20Top.jpg.jpeg
    Special Offer

    C24 Timber Joists UC4 Treated Redwood 47 x 150 x 3600mm (6x2)

    Discover the exceptional quality of our C24 Timber Joists, expertly crafted to support your decking projects with strength and reliability. Made from premium UC4 treated Redwood, these joists are ideal for outdoor use and can withstand direct ground...
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    C24 Timber Joists Untreated Kiln Dried Regularised PEFC 47 x 100mm (4x2)

    £3.80 - £21.85 per piece (Ex VAT)
    £4.56 - £26.22 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...
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    C24 Timber UC2 Treated Kiln Dried Regularised PEFC 47 x 75mm (3x2)

    £3.08 - £17.72 per piece (Ex VAT)
    £3.70 - £21.26 per piece (Inc VAT)
    Main usage is for vertical non-load bearing stud positions. Due to the size of this 3x2 C24 graded timber carcassing, we recommended using it purely for vertical non-load bearing stud positions. C16 and C24 are strength grades; the higher the grade, the...
  • Special Offer
    C24%2044x95%20Treated%20Main.jpg.jpeg C24%2044x95%20Treated%20TopAngle.jpg.jpeg
    Special Offer

    C24 Timber Joists UC4 Treated Redwood 47 x 100 x 4800mm (4x2)

    Elevate your outdoor projects with C24 Treated Timber Decking Joists, meticulously crafted from premium Redwood and UC4 treated for exceptional ground contact durability. These joists are engineered from dense Scandinavian softwood, offering...
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    C24 Timber Joists Untreated Kiln Dried Regularised PEFC 47 x 150mm (6x2)

    £5.70 - £32.78 per piece (Ex VAT)
    £6.84 - £39.34 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...
  • Special Offer
    C24%2044x145%20Treated%20Main.jpg.jpeg C24%2044x145%20Treated%20Top.jpg.jpeg
    Special Offer

    C24 Timber Joists UC4 Treated Redwood 47 x 150 x 4800mm (6x2)

    Add the long lasting UC4 C24 Timber Joists to your garden, expertly designed for durability and strength. Ideal for constructing robust decking structures, these joists are UC4 treated, ensuring they withstand direct ground contact and resist moisture,...
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    C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 47 x 150mm (6x2)

    £6.16 - £35.44 per piece (Ex VAT)
    £7.39 - £42.53 per piece (Inc VAT)
    C24-treated timber joists are a top choice for structural applications, including stud walls, roof and floor joists, and joinery. With a smaller cross-section than C16, they can support higher loads and longer spans. Discover the unparalleled strength...
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    C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 47 x 100mm (4x2)

    £4.11 - £23.63 per piece (Ex VAT)
    £4.93 - £28.36 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...
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    C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 47 x 125mm (5x2)

    £5.14 - £29.53 per piece (Ex VAT)
    £6.17 - £35.44 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...
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    C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 47 x 200mm (8x2)

    £8.22 - £47.26 per piece (Ex VAT)
    £9.86 - £56.71 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...
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    C24 Timber Joists Untreated Kiln Dried Regularised PEFC 47 x 175mm (7x2)

    £6.65 - £38.24 per piece (Ex VAT)
    £7.98 - £45.89 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...
  • Special Offer
    C24%2044x145%20Treated%20Main.jpg.jpeg C24%2044x145%20Treated%20Top.jpg.jpeg
    Special Offer

    C24 Timber Decking Joists UC4 Treated Green Kiln Dried Regularised Redwood PEFC 47 x 150mm (6x2)

    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%2044x120%20Main.jpg.jpeg C24%2044x120%20Top.jpg.jpeg

    C24 Timber Joists Untreated Kiln Dried Regularised PEFC 47 x 125mm (5x2)

    £4.75 - £27.32 per piece (Ex VAT)
    £5.70 - £32.78 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...
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    C24 Timber Joists Untreated Kiln Dried Regularised PEFC 47 x 225mm (9x2)

    £8.55 - £49.17 per piece (Ex VAT)
    £10.26 - £59.00 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...
  • Special Offer
    C24%2044x95%20Treated%20Main.jpg.jpeg C24%2044x95%20Treated%20Top.jpg.jpeg
    Special Offer

    C24 Timber Decking Joists UC4 Treated Green Kiln Dried Regularised Redwood PEFC 47 x 100mm (4x2)

    Our C24 timber joists are a perfect for supporting your decked area. This timber is UC4 treated, meaning that not only is it ideal for outdoor use, but it is also suitable for direct contact with the ground. C16 and C24 are strength grades; the higher...
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    C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 47 x 175mm (7x2)

    £7.19 - £41.35 per piece (Ex VAT)
    £8.63 - £49.62 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...
  • C24%2044x95%20Main.jpg.jpeg C24%2044x95%20TopAngle.jpg.jpeg

    C24 Timber Joists Untreated Kiln Dried Regularised FSC 47 x 100mm (4x2)

    £3.80 - £21.85 per piece (Ex VAT)
    £4.56 - £26.22 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...
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    C24 Timber UC2 Treated Kiln Dried Regularised FSC 47 x 75mm (3x2)

    £3.08 - £17.72 per piece (Ex VAT)
    £3.70 - £21.26 per piece (Inc VAT)
    Main usage is for vertical non-load bearing stud positions. 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...
  • C24%2044x195%20Main.jpg.jpeg C24%2044x195%20Top%20Angle_.jpg.jpeg

    C24 Timber Joists Untreated Kiln Dried Regularised PEFC 47 x 200mm (8x2)

    £7.60 - £43.70 per piece (Ex VAT)
    £9.12 - £52.44 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...
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    C24 Timber Untreated Kiln Dried Regularised FSC 47 x 75mm (3x2)

    £2.85 - £16.39 per piece (Ex VAT)
    £3.42 - £19.67 per piece (Inc VAT)
    C24 graded 3x2 timber carcassing is typically used for structural timber commonly used for stud walls, roof and floor joists, and structural joinery. However, as this is only 3x2, it's main usage is for vertical non-load bearing stud positions. C16 and...
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    C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 75 x 100mm (4x3)

    £6.92 - £39.80 per piece (Ex VAT)
    £8.30 - £47.76 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...

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.