Designed with a recessed section to hold timber in place and a built-in fixing hole, this post allows for secure and accurate installation of decking joists or framework timbers.

Concrete construction ensures the post is resistant to moisture, rot, and ground conditions, offering a long-lasting and low-maintenance solution for outdoor projects.

Ideal for use in decking installations, raised platforms, and garden structures, these posts provide reliable support where ground contact is required.

Specifications

• Height: 600mm

• Material: Concrete

• Features: Recessed timber seat and fixing hole

• Benefits: Durable, rot resistant, no cutting required

• Suitable for: Decking support, timber frameworks, garden builds

How do you install concrete deck support posts?

Dig a hole approximately 300mm deep and position the post in place. Use Postcrete to secure the post, ensuring it is set firmly and allowed to fully set before continuing.

Once set, place your timber into the recessed section and fix it securely using the pre-formed hole. Build your decking frame from this point, making sure all posts are level and aligned to avoid an uneven or wonky deck.

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Each post features a recessed section to sit timber securely, along with a pre-formed fixing hole to allow timbers to be fixed firmly in place. This ensures a stable and secure connection between the post and decking framework.

Manufactured from durable concrete, these posts are resistant to moisture, rot, and ground contact, making them ideal for long-term outdoor use.

Perfect for supporting decking frames, joists, and garden structures, these posts offer a practical and low-maintenance alternative to timber supports.

Specifications

• Height: 450mm

• Material: Concrete

• Features: Recessed timber seat and fixing hole

• Benefits: Lightweight, no cutting required, rot resistant

• Suitable for: Decking frames, joists, garden structures

How do you install concrete deck support posts?

Dig a hole approximately 300mm deep and position the post in place. Use Postcrete to secure the post, ensuring it is set firmly and allowed to fully set before continuing.

Once set, place your timber into the recessed section and fix it securely using the pre-formed hole. Build your decking frame from this point, making sure all posts are level and aligned to avoid an uneven or wonky deck.

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This 3.6m x 200mm x 47mm C24 graded timber is designed for structural applications requiring high strength and durability. Pressure treated and kiln dried, it provides long-lasting performance outdoors.

Suitable for decking frames, beams, and construction projects, this timber offers excellent load-bearing capability and stability.

Its C24 grading ensures superior strength, making it a dependable choice for professional structural builds.

What’s the difference between C24 and C16 timber?

If you’re unsure what C24 means or whether it’s worth the upgrade from C16, check out our blog:
What is C24 Timber? C24 vs C16 Explained – Clear breakdown of strength, span, and usage recommendations.

How do you install C24 structural timber?

When used in decking or flooring, ensure a stable level base. Fix using ForgeFast Timber Screws and protect exposed joist tops with Joist Flashing Tape to prolong service life and improve water resistance.

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This 3.0m x 50mm x 47mm C24 graded timber is a strong, reliable choice for structural framing, battens, and general construction. Pressure treated and kiln dried, it offers improved durability and dimensional stability for both indoor and outdoor use.

C24 timber is strength graded timber, graded to a higher standard than C16, providing greater load-bearing performance and improved straightness. This makes it suitable for professional construction, landscaping, and garden building projects.

Planed for a consistent finish, this timber section is easy to work with and ideal for smaller structural elements, framing, and support applications where treated structural timber is required.

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This 3.6m x 150mm x 47mm C24 graded timber is a heavy-duty structural timber designed for decking subframes, joists, and load-bearing construction. Pressure treated and kiln dried, it offers strength and protection for outdoor use.

The C24 strength grading ensures reliable structural performance, making it suitable for demanding applications such as decking frames and garden structures.

Its planed finish provides accurate sizing and ease of installation, ensuring professional-quality results.

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This 4.8m x 100mm x 47mm C24 graded timber is ideal for structural framing, decking joists, and construction applications. Pressure treated and kiln dried, it provides long-term durability outdoors.

C24 grading ensures strength and reliability, making it suitable for load-bearing timber structures.

Its extended length allows for fewer joins, improving strength and installation efficiency.

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This 3.6m x 100mm x 47mm C24 graded timber is designed for structural use in decking frames, joists, and construction projects. Pressure treated and kiln dried, it offers durability and long-term performance outdoors.

C24 timber provides excellent load-bearing strength and improved straightness compared to lower grades, making it suitable for structural framing and landscaping builds.

Planed for consistent sizing, it ensures easy installation and dependable performance across a wide range of structural applications.

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This 2.4m x 75mm x 47mm C24 graded timber provides dependable structural strength for framing, joists, and general building applications. Pressure treated and kiln dried, it offers long-term protection against moisture and decay.

C24 grading ensures superior strength and consistency, making it suitable for load-bearing construction and outdoor structural use. Its planed finish allows for accurate installation and a professional result.

Commonly used in garden buildings, structural frames, and timber construction, this treated timber offers reliability for both trade and DIY projects.

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This 4.8m x 150mm x 47mm timber is a C24 structural grade, kiln-dried and pressure treated to enhance durability, strength, and resistance to fungal decay. It’s the ideal timber for decking subframes, floor joists, garden rooms, and heavy-duty framing where structural integrity and long life are essential.

Perfect for use in professional landscaping or self-build projects, this size balances strength and handling convenience. Pair it with our range of decking boards for complete structural builds, and extend its life with accessories like Joist Flashing Tape and ForgeFast Timber Screws.

Specifications

• Size: 4.8m (length) x 150mm (width) x 47mm (depth)

• Grade: C24 structural timber

• Finish: Kiln-dried and pressure treated

• Edge: Planed all round with eased edges

• Use: Indoor and outdoor structural projects

Common Applications

Decking Subframes

Ideal for medium-span decking bases. Use with Joist Flashing Tape to shield joists from rain exposure and ForgeFast Screws for secure, high-load fixings.

Garden Structures & Framing

Suitable for timber outbuildings, pergola beams, raised planter boxes, and more — thanks to its dimensional stability and strength rating.

Roofing & Flooring Support

C24 grading provides load support that suits loft joists and flooring frames where certified strength is needed.

Materials related to “C24 Structural Timber”

• Decking Boards – Compatible finish to complete timber-framed decks

• Joist Flashing Tape – Preserves timber from weather damage

• ForgeFast Timber Screws – Durable, torx-compatible screws ideal for structural fixing

• Sleepers – Additional timber components for structural and decorative builds

• Roofing Timber & Ply – Support your construction projects

• Full C24 Range – See other available dimensions

What’s the difference between C24 and C16 timber?

To understand why C24 timber is a popular choice for outdoor and structural builds, read our in-depth blog:
What is C24 Timber? C24 vs C16 Explained – we cover grading, span length, structural use cases and when to choose one over the other.

How do you install C24 structural timber?

Lay on a flat, prepared surface or concrete base. Secure with ForgeFast Timber Screws and apply Joist Flashing Tape along the top surface of joists for weather protection and added longevity.

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This 4.8m x 200mm x 47mm timber is C24-graded, kiln-dried, and pressure treated for durability, making it ideal for structural load-bearing applications both indoors and outdoors. Its strength and size make it a popular choice for decking subframes (see our full range of decking boards), floor joists, roof rafters, and garden structures.

The timber is planed with eased edges for safe handling and uniform sizing. The pressure treatment helps protect against fungal decay and insect attack, ensuring reliable performance in exposed settings.

Specifications

• Size: 4.8m (length) x 200mm (width) x 47mm (depth)

• Grade: C24 structural timber

• Finish: Kiln-dried and pressure treated

• Edge: Planed all round with eased edges

• Use: Indoor and outdoor structural use

Common Applications

Decking Subframes

Ideal for multi-level or raised decking installations. For added durability, use with ForgeFast Timber Screws for strong structural fixings and Joist Flashing Tape to protect joist tops from water ingress.

Roof Rafters & Joists

Used extensively in building projects for its strength and grading, C24 timber is suitable for both roofing and flooring structures.

Garden Structures

Perfect for building large pergolas, outbuildings, and frameworks where rigidity and treatment lifespan are crucial.

Materials related to “C24 Structural Timber”

• Decking Boards – Designed to pair with treated C24 timber frames

• Joist Flashing Tape – Protects top edges of timber joists from moisture

• ForgeFast Timber Screws – High-strength structural screws for timber framing

• Sleepers – For edging, retaining walls or decorative outdoor framing

• Roofing Timber & Ply – Compatible timber products for roofing use

• Full C24 Range – Explore more sizes and lengths

What’s the difference between C24 and C16 timber?

Want to understand the real value of C24 timber and why it’s worth the upgrade from C16?
Check out our blog: What is C24 Timber? C24 vs C16 Explained – where we break down structural strength, treatment, span performance, and where each grade is most suitable.

How do you install C24 structural timber for decking?

Use a level base or concrete pad system, and space your joists correctly depending on span requirements. Fix C24 timber with ForgeFast Timber Screws and apply Joist Flashing Tape to prolong lifespan and prevent moisture ingress from decking boards.

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