Howarth Timber & Building Supplies

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News & Information (4)

C16 vs C24

There are a multitude of different timbers available, but if two of the most popular grades of timber went head-to-head, it would have to be a straight fight of the heavyweights – C16 vs C24 ti ...

How to Build a Garden Shed

Building your own garden structure is easier than you may think and so rewarding. Deciding where you would like you garden structure to be located is a big decision. To make the most of your structu ...

Treated Timber Use Classes Explained

Not all timber is created equally. When you're working on outdoor projects, choosing the right type of treated wood is vital. Different jobs need different treatments to protect the timber from weath ...

Types of Timber: All you need to know

If you’re in the building trade, a joiner in particular, or work at Howarth Timber & Building Supplies, you’ll know a great deal about the different types of timber. But there is alwa ...

Products (98)

C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 47 x 100mm (4x2)

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£4.09 - £23.49 per piece (Ex VAT)

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£4.91 - £28.19 per piece (Inc VAT)

Discover the incredible strength and versatility of our C16 Timber Joists. These structural wood pieces are kiln dried and expertly pressure treated, making them resistant to wood-destroying fungi...

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£4.09 - £23.49 per piece (Ex VAT)

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£4.91 - £28.19 per piece (Inc VAT)
C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 47 x 75mm (3x2)

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£3.25 - £18.67 per piece (Ex VAT)

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£3.90 - £22.40 per piece (Inc VAT)

C16 Timber Joists, expertly crafted for those who seek durability and reliability in construction projects. These UC3u treated, kiln-dried, and regularised joists are designed for external use,...

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£3.25 - £18.67 per piece (Ex VAT)

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£3.90 - £22.40 per piece (Inc VAT)
C16 Timber Joist UC3u Treated Kiln Dried FSC 47 x 150mm (6x2)

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£6.13 - £35.23 per piece (Ex VAT)

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£7.36 - £42.28 per piece (Inc VAT)

Transform your outdoor spaces with our Timber Floor Joist, designed specifically for external use, making them perfect for decking joists. These robust timber joists are your go-to solution for...

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£6.13 - £35.23 per piece (Ex VAT)

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£7.36 - £42.28 per piece (Inc VAT)
C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 47 x 100mm (4x1)

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£4.15 - £23.86 per piece (Ex VAT)

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£4.98 - £28.63 per piece (Inc VAT)

C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC timber is your go-to choice for robust structural applications. This timber is ideal for constructing stud walls, roof and floor joists, and...

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£4.15 - £23.86 per piece (Ex VAT)

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£4.98 - £28.63 per piece (Inc VAT)
C24 Timber Joists Kiln Dried Regularised PEFC 44 x 70mm (3x2)

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£2.88 - £16.56 per piece (Ex VAT)

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£3.46 - £19.87 per piece (Inc VAT)

C24 is a structural timber typically used to support structures and frameworks for buildings such as walls, ceilings and decking joists. It has many other uses for structural joinery. The use of C24...

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£2.88 - £16.56 per piece (Ex VAT)

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£3.46 - £19.87 per piece (Inc VAT)
C16 Timber Joists UC4 Treated Brown Incised Kiln Dried Regularised FSC 47 x 100mm (4x2)

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£4.20 - £24.16 per piece (Ex VAT)

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£5.04 - £28.99 per piece (Inc VAT)

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...

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£4.20 - £24.16 per piece (Ex VAT)

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£5.04 - £28.99 per piece (Inc VAT)
C24 Timber Joists Kiln Dried Regularised PEFC 44 x 95mm (4x1)

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£3.84 - £22.08 per piece (Ex VAT)

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£4.61 - £26.50 per piece (Inc VAT)

C24 is a structural timber typically used to support structures and frameworks for buildings such as walls, ceilings and decking joists. It has many other uses for structural joinery. The use of C24...

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£3.84 - £22.08 per piece (Ex VAT)

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£4.61 - £26.50 per piece (Inc VAT)
C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 44 x 70mm (3x2)

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£3.11 - £17.89 per piece (Ex VAT)

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£3.73 - £21.47 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...

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£3.11 - £17.89 per piece (Ex VAT)

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£3.73 - £21.47 per piece (Inc VAT)
C24 Timber Joists Kiln Dried Regularised PEFC 44 x 145mm (6x2)

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£5.76 - £33.13 per piece (Ex VAT)

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£6.91 - £39.76 per piece (Inc VAT)

C24 is a structural timber typically used to support structures and frameworks for buildings such as walls, ceilings and decking joists. It has many other uses for structural joinery. The use of C24...

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£5.76 - £33.13 per piece (Ex VAT)

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£6.91 - £39.76 per piece (Inc VAT)
C16 Timber Joists UC4 Treated Brown Incised Kiln Dried Regularised FSC 47 x 150mm (6x2)

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£6.30 - £36.24 per piece (Ex VAT)

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£7.56 - £43.49 per piece (Inc VAT)

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,...

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£6.30 - £36.24 per piece (Ex VAT)

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£7.56 - £43.49 per piece (Inc VAT)
ArborDeck Timber Decking UC3u Treated Reversible Smooth or Grooved 32 x 150 x 4200mm

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£18.24 per piece (Inc VAT)

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£15.20 per piece (Ex VAT)

Transform your outdoor space with ArborDeck Timber Decking, a versatile and high-quality option for both traditional and contemporary gardens. These UC3u treated reversible decking boards, available...

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£18.24 per piece (Inc VAT)

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£15.20 per piece (Ex VAT)
CLS Timber PEFC 50 x 100 x 2400mm

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£7.93 per piece (Inc VAT)

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£6.61 per piece (Ex VAT)

Canadian Lumber Standard (CLS) timber is a high-quality structural wood commonly used in construction projects. Available in a range of CLS timber sizes, including 3x2 CLS timber and 4x2 CLS timber,...

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£7.93 per piece (Inc VAT)

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£6.61 per piece (Ex VAT)
C24 Timber Joists UC2 PEFC 47 x 150mm (6x2)

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£6.22 - £35.79 per piece (Ex VAT)

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£7.46 - £42.95 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...

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£6.22 - £35.79 per piece (Ex VAT)

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£7.46 - £42.95 per piece (Inc VAT)
C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 44 x 95mm (4x1)

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£4.15 - £23.86 per piece (Ex VAT)

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£4.98 - £28.63 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...

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£4.15 - £23.86 per piece (Ex VAT)

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£4.98 - £28.63 per piece (Inc VAT)
C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 44 x 120mm (5x2)

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£5.19 - £29.82 per piece (Ex VAT)

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£6.23 - £35.78 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...

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£5.19 - £29.82 per piece (Ex VAT)

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£6.23 - £35.78 per piece (Inc VAT)
C16 Timber Joists Untreated Kiln Dried Regularised FSC 44 x 95mm (4x2)

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£3.73 - £21.47 per piece (Ex VAT)

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£4.48 - £25.76 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...

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£3.73 - £21.47 per piece (Ex VAT)

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£4.48 - £25.76 per piece (Inc VAT)
C16 Timber Joists Treated Kiln Dried Regularised PEFC 44 x 70mm (3x2)

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£3.11 - £17.89 per piece (Ex VAT)

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£3.73 - £21.47 per piece (Inc VAT)

C16 graded carcassing is a structural timber commonly used for stud walls, roof and floor joists, and structural joinery. C16 is normally the grade that is produced from faster grown UK timber. It is...

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£3.11 - £17.89 per piece (Ex VAT)

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£3.73 - £21.47 per piece (Inc VAT)
C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 44 x 195mm (8x2)

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£8.30 - £47.72 per piece (Ex VAT)

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£9.96 - £57.26 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...

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£8.30 - £47.72 per piece (Ex VAT)

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£9.96 - £57.26 per piece (Inc VAT)
MDF Wall Board Moisture Resistant 9 x 2440 x 1220mm

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£63.96 each (Inc VAT)

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£53.30 each (Ex VAT)

This moisture-resistant MDF wall board is perfect for achieving a stylish panelling effect on walls and ceilings. Designed for durability, it provides a smooth surface that's easy to paint or finish,...

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£63.96 each (Inc VAT)

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£53.30 each (Ex VAT)
C24 Timber Joists Kiln Dried Regularised PEFC 44 x 170mm (7x2)

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£6.72 - £38.65 per piece (Ex VAT)

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£8.06 - £46.38 per piece (Inc VAT)

C24 is a structural timber typically used to support structures and frameworks for buildings such as walls, ceilings and decking joists. It has many other uses for structural joinery. The use of C24...

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£6.72 - £38.65 per piece (Ex VAT)

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£8.06 - £46.38 per piece (Inc VAT)
C24 Timber Joists Kiln Dried Regularised PEFC 44 x 120mm (5x2)

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£4.80 - £27.60 per piece (Ex VAT)

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£5.76 - £33.12 per piece (Inc VAT)

C24 is a structural timber typically used to support structures and frameworks for buildings such as walls, ceilings and decking joists. It has many other uses for structural joinery. The use of C24...

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£4.80 - £27.60 per piece (Ex VAT)

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£5.76 - £33.12 per piece (Inc VAT)
C24 Timber Joists Kiln Dried Regularised PEFC 44 x 220mm (9x2)

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£8.64 - £49.69 per piece (Ex VAT)

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£10.37 - £59.63 per piece (Inc VAT)

C24 is a structural timber typically used to support structures and frameworks for buildings such as walls, ceilings and decking joists. It has many other uses for structural joinery. The use of C24...

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£8.64 - £49.69 per piece (Ex VAT)

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£10.37 - £59.63 per piece (Inc VAT)
C16 Timber Joists Kiln Dried Regularised FSC 44 x 95mm (4x1)

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£3.84 - £22.08 per piece (Ex VAT)

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£4.61 - £26.50 per piece (Inc VAT)

C16 graded carcassing is a structural timber commonly used for stud walls, roof and floor joists, and structural joinery. C16 is normally the grade that is produced from faster grown UK timber. It is...

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£3.84 - £22.08 per piece (Ex VAT)

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£4.61 - £26.50 per piece (Inc VAT)
C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 44 x 170mm (7x2)

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£7.26 - £41.75 per piece (Ex VAT)

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£8.71 - £50.10 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...

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£7.26 - £41.75 per piece (Ex VAT)

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£8.71 - £50.10 per piece (Inc VAT)

Featured Products

Siniat GTEC Standard Plasterboard Square Edge 2400 x 1200 x 12.5mm

Designed for partitions, linings and ceilings, this standard board is square edged and most suitable for undecorated applications or textured finishes. It is also suitable for gypsum plaster...

Siniat GTEC Cove 120 3000mm

A gypsum plaster moulding manufactured in a larger traditional cove profile, provides an attractive feature at the junction of walls and ceilings.

Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 100mm

Unilin / Xtratherm XT Thermal Liner MF Insulation PIR Board is a composite insulated panel of Unilin / Xtratherm PIR insulation core with a composite foil facing bonded to 12.5mm tapered edge...

Kronospan P5 Chipboard Flooring TG4 FSC 2400 x 600 x 18mm

The Kronospan P5 is the perfect chipboard flooring for adding practical space to your loft area. It is rated Particleboard P5 and therefore designed to be a load-bearing panel for use in dry and...

Kronospan P5 Chipboard Flooring TG4 FSC 2400 x 600 x 22mm

The Kronospan P5 is the perfect chipboard flooring for adding practical space to your loft area. It is rated Particleboard P5 and therefore designed to be a load-bearing panel for use in dry and...

Plywood PRC Mixed Light Hardwood EN636-2S Class 2 FSC 18 x 1220 x 2440mm

MLH (Mixed Light Hardwoods) is an internal and external plywood. It has a light sanded finish, which can be easily cut or painted and has a variety of uses. These include treated exteriors such as...

Plywood PRC Mixed Light Hardwood EN636-2S Class 2 FSC 12 x 1220 x 2440mm

MLH (Mixed Light Hardwoods) is an internal and external plywood. It has a light sanded finish, which can be easily cut or painted and has a variety of uses. These include treated exteriors such as...

Green Incised Softwood UC4 Treated Garden Sleeper 95 x 195 x 2400mm

Transform your outdoor space with the versatile Green Incised Softwood UC4 Treated Garden Sleeper. Perfect for multiple landscaping applications, these sleepers can be used to craft raised garden...

OSB3 Board Square Edge FSC 2440 x 1220 x 11mm

The OSB is suitable for load bearing applications in construction and all different environmental conditions such as extreme humidity and dryness. The moisture resistant board is engineered for...

15I0005935_HOWARTH_2025-12-15T13_57_06.277Z_benefit_design_out.jpg.jpeg

OSB3 Board Square Edge FSC 2440 x 1220 x 18mm

Sterling OSB3 Board is the perfect solution for both construction professionals and DIY enthusiasts seeking durability and versatility in their projects. Engineered to withstand extreme humidity and...

09I0001056_HOWARTH_2026-01-02T13_16_35.433Z_benefit_design_out.jpeg

CLS Timber PEFC 50 x 75 x 2400mm

Canadian Lumber Standard (CLS) is a structural timber available in a variety of sections and lengths most used in construction. Discover the strength and versatility of our CLS Timber, crafted to...

Timloc%20Building%20Products%20-%20RTV-SPGR%20Single%20Pantile%20Roof%20Tile%20Vent%20-%20Grey.png

Timloc Single Pantile Tile Vent Grey (RTV-SPGR )

Profiled roof tile vent to enable ventilation directly into a roof space or connect to a ducted ventilation system. Timloc Building Products has been serving the building industry for over 50 years...

Gutter Trim Internal Corner Black (910017.CB)

These components make the detailing of roof perimeters fast and easy without having to make any compromise.

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Timloc Clip Fit Plastic Access Panel White 205 x 205mm (AP200)

This access panel allows easy access to connectors and concealed services which are hidden in ceilings, ducting and behind dry lined walls. This access panel features a clip fit door panel.

Everbuild 503 SBR Bond 5 Litre (SBR5L)

SBR Bond is a latex based, water resistant bonding agent and admixture for use in areas subject to humidity, dampness and continuous water contact. It improves water resistance of cement mixtures by...

Brett Martin 110mm 0'-30' Adjustable Double Socket Bend Terracotta 110 x 250 x 110mm

Our comprehensive range of underground products include pipes in up to 13 diameters from 58.9mm to 600mm, industry compliant fittings All Brett Martin products including Brett Martin 110mm 0'-30'...

BEX0032097_HOWARTH_2025-12-01T13_32_20.068Z_benefit_design_out.jpg.jpeg

Hanson Multicem Cement Plastic Bag (25kg)

Introducing Hanson Multicem Cement, your go-to solution for reliable and high-quality construction projects. This innovative cement mix is specially formulated for easy spreading, superior water...

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Everbuild Opti-Mix Mortar Plasticiser 1 Litre

The world's first 1:25 plasticiser, Opti-Mix Mortar Plasticiser is essentially Pure Admix that smells and operates like the best traditional Admix. Superior plasticising effect, controlled dosage,...

C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 47 x 100mm (4x1)

£4.15 - £23.86 per piece (Ex VAT)

£4.98 - £28.63 per piece (Inc VAT)

C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC timber is your go-to choice for robust structural applications. This timber is ideal for constructing stud walls, roof and floor joists, and...

£4.15 - £23.86 per piece (Ex VAT)

£4.98 - £28.63 per piece (Inc VAT)

C24 Timber Joists Kiln Dried Regularised PEFC 44 x 95mm (4x1)

£3.84 - £22.08 per piece (Ex VAT)

£4.61 - £26.50 per piece (Inc VAT)

C24 is a structural timber typically used to support structures and frameworks for buildings such as walls, ceilings and decking joists. It has many other uses for structural joinery. The use of C24...