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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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    Rough Sawn Timber UC3u Treated Green Unseasoned FSC 22 x 150mm (6x1)

    £2.85 - £16.39 per piece (Ex VAT)
    £3.42 - £19.67 per piece (Inc VAT)
    Manufactured from FSC certified sawn timber, so you have complete peace of mind that the timber is procured from sustainable sources. These fencing boards are UC3u treated timber, meaning they perfect for outdoor use providing it is above ground...
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    Rough Sawn Timber UC3u Treated Green Unseasoned FSC 22 x 100mm (4x1)

    £1.90 - £10.93 per piece (Ex VAT)
    £2.28 - £13.12 per piece (Inc VAT)
    Treated timber is suitable to be used externally and is suitable for wet areas, however UC3u treated timber shouldn't be used for in-ground or water contact. Examples of UC3u treated timber uses are outdoor decking, shed bases, posts, sleepers...
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 44 x 95 x 4800mm (4x2)

    £4.28 - £24.63 per piece (Ex VAT)
    £5.14 - £29.56 per piece (Inc VAT)
    Our planed & regularised treated sawn timber is perfect for structural timber carcassing as it comes in������C24 grade. This timber is ideal for a number of uses in the home and garden. The pressure treatment on this timber protects it against wood...
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    Rough Sawn Timber UC3u Treated Kiln Dried Regularised FSC 44 x 44mm (2x2)

    £2.16 - £12.45 per piece (Ex VAT)
    £2.59 - £14.94 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. Carcassing is a...
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    Timber Floor Joist UC3u Treated C16 FSC 44 x 145mm (6x2)

    £6.43 - £36.94 per piece (Ex VAT)
    £7.72 - £44.33 per piece (Inc VAT)
    Our treated timber floor joists are designed for external use, making them ideal for wet areas or direct ground contact. Common applications include timber decking joists, shed bases, posts, and sleepers. Available in various timber joist dimensions,...
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    Rough Sawn Timber UC3u Green Treated Unseasoned FSC 22 x 75mm (3x1)

    £1.43 - £8.20 per piece (Ex VAT)
    £1.72 - £9.84 per piece (Inc VAT)
    Carcassing is a standard term term that means the timber is used to form floors, walls, ceilings and roofs of properties. Unseasoned timber means timber than has not yet dried to a moisture content matched to its intended environment, which means it can...
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 47 x 75mm (3x2)

    £3.25 - £18.67 per piece (Ex VAT)
    £3.90 - £22.40 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...
  • Special Offer
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    Special Offer

    C24 Timber Joists UC4 Treated Green PEFC 45 x 145mm (6x2)

    £4.50 - £25.88 per piece (Ex VAT)
    £5.40 - £31.06 per piece (Inc VAT)
    Our C24 timber joists are ideal for supporting your decked area. This timber is treated with UC4 preservative, meaning that not only is it ideal for outdoor use, but it is also suitable for direct contact with the ground. C24 graded timber is produced...
  • Special Offer
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    Special Offer

    C24 Timber Joists UC4 Treated Green PEFC 45 x 95mm (4x2)

    £3.00 - £17.25 per piece (Ex VAT)
    £3.60 - £20.70 per piece (Inc VAT)
    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. C24 graded timber is produced from slower...
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    Rough Sawn Timber UC3u Treated Green Unseasoned FSC 22 x 200mm (8x1)

    £3.93 - £22.62 per piece (Ex VAT)
    £4.72 - £27.14 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.
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 44 x 120mm (5x2)

    £5.35 - £30.79 per piece (Ex VAT)
    £6.42 - £36.95 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...
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 44 x 195mm (8x2)

    £8.57 - £49.26 per piece (Ex VAT)
    £10.28 - £59.11 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...
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    Rough Sawn Timber UC3 Treated Green Unseasoned FSC 22 x 225mm

    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. Carcassing is a...
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 44 x 220mm (9x2)

    £9.64 - £55.42 per piece (Ex VAT)
    £11.57 - £66.50 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...
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 44 x 170mm (7x2)

    £7.50 - £43.10 per piece (Ex VAT)
    £9.00 - £51.72 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...
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 72 x 97mm (4x3)

    £6.84 - £39.30 per piece (Ex VAT)
    £8.21 - £47.16 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...
  • Special Offer
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    Special Offer

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

    £3.00 - £17.25 per piece (Ex VAT)
    £3.60 - £20.70 per piece (Inc VAT)
    C16 deck joists are 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 graded timber is home grown conifer timber such as...
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 72 x 145mm (6x3)

    £10.25 - £58.95 per piece (Ex VAT)
    £12.30 - £70.74 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...
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    Rough Sawn Timber UC3u Treated Unseasoned UK FSC 25 x 38mm

    £1.01 - £5.83 per piece (Ex VAT)
    £1.21 - £7.00 per piece (Inc VAT)
    Sawn softwood timber pressure treated to enhance resistance to rot, insect and fungal attack. Ideal framing timber for a multitude of end uses.
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 72 x 170mm (7x3)

    £11.96 - £68.78 per piece (Ex VAT)
    £14.35 - £82.54 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...
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 72 x 195mm (8x3)

    £13.67 - £78.60 per piece (Ex VAT)
    £16.40 - £94.32 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...
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    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 72 x 220mm (9x3)

    £15.38 - £88.43 per piece (Ex VAT)
    £18.46 - £106.12 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...
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    Green Treated UC3u Unseasoned Rough Sawn Timber FSC 22 x 150 x 1800mm (6x1)

    Green Treated Fence Boards 1.8m are pressure treated to ensure durability and prevent rot and are ideal to create a traditional boarded fence. This fence board may be used to support a row of wooden fence panels. Our fencing panels are available in a...

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.