The UK's most affordable, high-quality decking board

C24 Sawn Green Treated Timber Decking Joist 47mm x 100mm

From £14.45

About this product

Start your decking project with a strong and stable base using Cladco Sawn Green Treated Timber Joists measuring 47mm x 100mm. FSC certified and special preservatives provide a long-lasting structural base.
Total Price: £14.45 Inc VAT
View our product installation guide

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Nationwide Delivery

C24 Sawn Green Treated Timber Decking Joist 47mm x 100mm

C24 Sawn Green Treated Timber Decking Joist 47mm x 100mm
C24 Sawn Green Treated Timber Decking Joist 47mm x 100mm

The Benefit of using our Timber Decking Joists

Building the base you need under your timber decking boards wouldn’t be possible without using our FSC Certified timber joists. Used in conjunction with our timber posts, you will be able to create a structurally stable base that lasts. Graded C24 in strength class, our timber decking joists are sawn and green treated with Tanalith ‘E’ preservative to ensure long-lasting protection from the elements.

Joist Length: 4.2m & 4.8m
Joist Width: 100mm
Joist Depth: 47mm
Each joist weighs approximately: 9.96kg (4.2m) and 11.38kg (4.8m)

Our timber joists are responsibly sourced and are great for creating a supporting frame on top of a concrete base. Our 47mm x 100mm timber joists are available in both 4.2m and 4.8m in length and can be sawn, planed or drilled however you want to fit your decking project, weighing 9.96kg and 11.38kg respectively.

Timber Joists for Perfect Decking

When used efficiently, timber decking joists completely support the base of your decking boards. We highly recommend using on top of a concrete base as this will ensure the flattest possible surface to work with. Used alongside our timber posts will ensure as solid a structure to start from, meaning many years of usage without issue.

Using our handy installation guides will help to show the best practices we recommend. We also have a number of trims and fixings we recommend for use when putting together your timber decking.

What does C24 timber mean? 

The C24 in Cladco timber joists referes to the type of timber used, C24 timber is 50% stronger than C16 timber and has significantly less knots in the wood. This allows the timber to bear more weight than a C16 timber joist so can be used for longer spans or increased loads. The dense fibres within the wood increase strength and durability as well as being green treated (tanalised) and FSC Certified.


Please click on the variable options on our checkout page.

Cladco offer a Nationwide delivery service (UK Mainland) We offer a range of options, please see the table below.

Useful Links: Delivery Policy | Collection Policy


Delivery is estimated 5 working days (1 week).


Collection from our Okehampton or Andover warehouse. Please note we need 2 hour notice.

Sample Packs

Sample packs are sent via Courier and delivered within 3-5 working days.

Pricing Table

National Delivery (Orders under £1,000) Estimated 5 working days* £192.00
(Orders over £1,000) Estimated 5 working days* £96.00
(Orders over £1,500) Estimated 5 working days* FREE
Scotland Delivery Estimated 15 working days* £360.00
Millboard Delivery (Orders under £2,000) Estimated 5 working days* £192.00
(Orders over £2,000) Estimated 5 working days* FREE
Parcelforce Standard
(Small Parcels)
3-5 Working Days £5.99
Parcelforce Standard
(Large Parcels)
3-5 working days £24.99
Sample Packs 5 Working Days FREE
*Please allow for public holidays and weekends (non-delivery days)

When your goods are delivered these are sometimes delivered on a pallet with the necessary associated packaging to ensure they arrive with you in the best possible condition. We view the pallet and packaging as necessary for the protection of the goods and therefore will be a part of what is delivered to you. It is your responsibility to dispose of these items in a responsible manner when appropriate.

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