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4-5 Week delivery

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Please note we have extended our delivery lead time to 4-5 weeks due to unprecedented order volumes, we apologise for this and rest assured this is a temporary measure. Please click the delivery tab for more information.

C24 Sawn Green Treated Timber Decking Joist 47mm x 150mm

Out of stock
C24 Sawn Green Treated Timber Decking Joist 47mm x 150mm
From £17.82

This product is sold in a range of colours including Charcoal Green

Restocking Soon

Unfortunately this product is currently out of stock, but we're expecting further stocks soon. You can pre-order the items on 01837 659901

Why Choose Our Timber Decking Joists?

Starting your base correctly is essential when it comes to building a decking project from the ground up, with our FSC Certified timber joists able to do the job perfectly. Used in conjunction with our timber posts, you will be able to create a sturdy base and supporting frame using timber decking joists.

Joist Length: 4.2m and 4.8m

Joist Width: 150mm

Joist Depth: 47mm

Each joist weighs approximately 18.6kg (4.2m) and 20.5kg (4.8m)

Our timber decking joists are high-pressure green treated with Tanalith ‘E’ preservative and are graded C24 for strength, meaning efficient structural performance. Produced from responsibly sourced wood, our timber joists are long-lasting and able to withstand the elements all year round.

Great Deck Building With Our Timber Joists

Our timber decking joists are available in both 4.2m and 4.8m in length, weighing 18.6kg and 20.5 kgs respectively. The 150mm timber decking joist is slightly wider than our 100mm timber joist, giving two options when considering creating your structural base.

We recommend using our timber joists on a solid concrete base to ensure they are as steady as possible. Consult our easy to use installation guides for further help and best practice techniques. We have trims and fixings available also to assist you with easy installation also.

What’s the difference between C16 timber and C24 timber?

C16 and C24 represent two different types of softwood timber, these numbers differentiate how quickly the timber was taken from a growing tree.

C16 timber is taken from trees which are grown much faster than regular trees, because of this forced processes the timber can have more knots in the wood than slower grown timber. This process of fast growing and increase in knots can also make the timber less dense meaning it is weaker and not as durable as C24. The longer a tree takes to grow the denser and stronger the wood will be.

C24 timber is approximately 50% stronger than C16 timber, this means it is more appropriate for longer spans or heavier loads. A C24 joist can bear more weight than a C16 joist thanks to the increase strength and durability within.  

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 25 working days (5 weeks).


Collection is from our Okehampton, Devon warehouse. Please note we need 5 working days noticed.

Sample Packs

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


Sample Packs 3-5 Working Days FREE
Royal Mail
(Small Parcels)
3-5 Working Days £3.95
Parcelforce Standard
(Small Parcels)
3-5 Working Days £8.33
Parcelforce Express
(Small Parcels)
1 working days £10.00
Parcelforce Standard
(Large Parcels)
3-5 working days £22.00
Cladco Profile Delivery
(Local Delivery)
Estimated 25 working days £48.00
Cladco Profile Delivery
(Most postcodes)
Estimated 25 working days £72.00
Cladco Profile Delivery
(Scotland Delivery)
within 25 working days £360.00