What are the main benefits of composite fencing?

Alpha Decking's composite fencing needs nearly zero maintenance compared to traditional wood. It's made from 60% recycled wood fibres and 40% recycled plastic and is stronger, more durable and weatherproof. It will not warp, crack or splinter and helps save time and money over the long term.

Can fence panels be cut to size?

Yes, composite panels can be cut to the required size using standard woodworking tools.

Structural Composite Joist 3.66m

Name: Structural Composite Joist 3.66m
Price: 39.99 GBP
Availability: InStock

No items found.

Length 3.66m

Width 100mm

Thickness 50mm

Structural Composite Joist 3.66m

100mm x 50mm Composite Joists are weatherproof, low maintenance and offer hardwearing support for your decking. They can be used to create a stable subframe.

Dispatched Fast via Royal Mail 24

FREE delivery via Royal Mail 24

In Stock | Fast delivery

Available to Order - Approx lead time 5-6 weeks

In Stock

Limited Stock. Orders over 9 bays will be a pre-order with delivery approx mid December

In Stock

Limited Stock. Orders over 9 posts will be a pre-order with delivery approx mid December

In Stock

Limited Stock. Orders over 90 slats will be pre-order with delivery mid December

In Stock

Limited Stock. Orders over 10 sets will be pre-order with delivery mid December

Temporarily Out of Stock

U Channel Inserts are temporarily out of stock.
Pre-order with deliveries starting mid May. Secure your stock with a £100 deposit or order now online. For more information or to pay a deposit please contact our team

Anthracite 3.66m decking is temporarily out of stock.
Pre-order with deliveries starting November. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Oyster 3.66m decking is temporarily out of stock.
Pre-order with deliveries starting November. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Oak Slats are temporarily out of stock.
Pre-order with deliveries starting mid August. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Grey Slats are temporarily out of stock.
Pre-order with deliveries starting early July. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Charcoal Slats are temporarily out of stock.
Pre-order with deliveries starting early July. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Anthracite Slats are temporarily out of stock.
Pre-order with deliveries starting mid to late October. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Willow Anthracite Slats are temporarily out of stock.
Pre-order with deliveries starting late May. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Aluminium posts are temporarily out of stock.
Pre-order with deliveries starting January. Secure your stock with a £100 deposit or order now online. For more information or to pay a deposit please contact our team

Charcoal Posts 3m are temporarily out of stock.
Pre-order with deliveries starting end of June. Secure your stock with a £100 deposit or order now online. For more information or to pay a deposit please contact our team

Oak 3.66m Decking is temporarily out of stock.
Pre-order with deliveries starting mid-late April. Secure your stock with a £100 deposit or order now online. For more information or to pay a deposit please contact our team

Teak 3.66m Decking is temporarily out of stock.
Pre-order with deliveries starting late June. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Pre-order - Delivery Mid June
You can secure your stock with a £100 deposit.
For more information or to only pay a deposit please contact our team

Pre-order - Delivery Early July
You can secure your stock with a £100 deposit.
For more information or to only pay a deposit please contact our team

Due to limited stock orders over 7 total charcoal sets will be a pre-order with delivery starting early July. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Due to limited stock orders over 65 total charcoal slats will be a pre-order with delivery starting early July. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Due to limited stock orders over 18 total grey sets will be a pre-order with delivery starting early July. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Due to limited stock orders over 165 total grey slats will be a pre-order with delivery starting early July. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

inc vat

£ 39.99

inc vat

Important: This product is only available to customers who are purchasing, or have previously purchased, our composite fence panel sets or other components required to build full fencing bays. If you are ordering this product alongside other fencing components, such as slats and rails, to create fence sets, you may purchase as many as needed. However, orders placed for this item on its own, without any qualifying fencing products, may be cancelled and refunded due to stock allocation.

Per customer:

1 sample boxes of any type - £0.00 with Free P&P
for 2 or more boxes a small postage charge will apply.

If you proceed with a future order we will refund any postage paid for samples.

Per customer:

1 sample pack of any type - £0.00 with Free P&P
For 2 or more boxes a small postage charge will apply.

If you proceed with a future order we will refund any postage paid for multiple sample boxes.

Don't know how much to order? Use free our decking calculator here

Additional item you may need to install your decking:

Composite Decking Spacer Clips

Hidden fixings clips for your composite decking. We recommend around 10 clips per one 3.66m board

Box of 100 Black Stainless Steel Spacer Clips and Screws

£ 32.00

Composite Decking Starter Clips

Used to secure your first row of boards in place. We recommend around 50 clips per every 80 3.66m boards

Box of 50 Stainless Steel Starter Clips and Screws

£ 15.00

Additional item you may need to complete your fence:

Post & Cap Information
Fence Sets include:
• 1 Composite Post
• 1 Post Cap

‍For 1 fence run:
– Add just 1 extra post + 1 cap

For multiple runs:
– Add 1 extra post + 1 cap per additional run

Example:
• 10 sets in 1 run → Add 1 extra post + 1 cap
• 10 sets in 2 runs → Add 2 extra posts + 2 caps

Composite Fence Post (End Post)

Composite Fence Posts

£ 33.00

Colour:

colourOfPost

Height:

heightOfPost

Composite Fence Post (End Post)

Composite Fence Post Caps

£ 5.00

Colour:

colourOfPost

Height:

heightOfPost

Standing Base

Only if you are purchasing a set to be on 'On Top Of A Solid Base' you may also need 1 additional standing base for your end composite post

Composite Fence Post Standing Base

£ 12.00

Height:

heightOfPost

Product Overview

Our Structural Composite Joists are weatherproof, low maintenance, hardwearing supports ideal for creating strong and stable cross beam network for your subframe.

Having a strong stable subframe is critical to all decking projects and using composite joists that will not rot, warping, splinter or split, and won’t require the treatment create the perfect replacement for timber joists.

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Specifications

Each joist measures: 3600mm x 100mm x 50mm
Approximate weight: 15.7kg each

These 100mm x 50mm joists should be spaced no more than a maximum of 400mm apart for Decking.

Alpha Composite joists can be used for most domestic decking and can be used directly on a solid weight-bearing base such as concrete or used as part of a post and joist network.

How many will I need?

We recommend approximately 1 structural joists per square metre of decking.

*Please note images are used for illustration purposes only, actual item may vary slightly from the image supplied.

Key Features

All our residential composite decking and composite fencing comes with a limited 15 year warranty so there's no need to worry.

In Stock

Free delivery on all orders over £1,500

Fast Delivery on all In Stock products.

Orders under £1,500 - Standard Delivery - £79.99
Orders over £1,500 - Standard Delivery - FREE

‍
Standard delivery lead times for In Stock products: 3-8 Working Days (England & Wales)

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*Scotland Deliveries have a minimum long distance delivery charge of £300 for all orders and delivered within 15 working days

Deliveries are mainland only and exclude - Scottish Isles, Highlands, IOM, IOW, GY, JE.

Deliveries where ferries are necessary may be possible at an extra cost such as IOW, please contact us before ordering.

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All our standard deliveries are made by our in house delivery team to ensure the products arrive to you in perfect condition every time.

We have a 5* rating on Google Reviews

We're rated excellent on Trustpilot

Alpha Decking Rated Excellent on Trustpilot

View and download all our installation guides:

View all our Installation Guides

Steel Gate:

Download our Steel Gate Installation Guide

Use our free decking calculator

Length (Meters)

Error

Width (Meters)

or enter the area in Sqm

You will need

0 3.66m boards

Use of full decking calculator here

Full Calculator

Composite Decking FAQs

What are the main benefits of composite decking?

Alpha Decking's WPC decking needs far less maintenance and in most circumstances none compared to traditional wood decking options. The plastic content in our decking means our boards are resistant to rot and damp, and are extremely slip resistant with no warping or cracking. WPC decking will also never need to be sealed, stained or painted saving you £1000’s over your decking’s life span.

What does the 15 year warranty cover?

Alpha Decking's 15 year warranty protects against warping, cracking, splitting, rotting and fungal decay caused by manufacturing defects, when subject to normal use. You can find the full warranty here.

Will my decking colour fade?

Over the first couple of months after installation you will notice your decking go through a weathering process, like anything left outside, due to UV exposure and naturally occuring tannins in the wood part of the boards being exposed to UV where the colour will start to become slightly lighter (typically around 10-20% depending on exposure and time of year) including a slight reduction in the wood grain, this will normally be most noticeable during the first 2 months exposure to UV light. This process can happen quicker or slower again depending on time of year and the amount of UV exposure the boards get. E.g in Winter this may happen over 4-5 months in Summer 1-2 months.

Please do not worry as this is completely normal and will generally start to stabilise after this initial period. Over the coming years once the product has stablised you may see a much slower reduction in colour as it's exposed UV light but is in most cases unnoticeable to the eye.

We have a picture graph below to give an example and a general representation of colour changes after 2 months outside exposed to UV light. Please note we have tried to accurately capture the colours but different lighting, angles and cameras and of course actual UV exposure means this may not be exactly how all boards will look after 2 months and is only suitable for this example. Colour change will vary across colours and batches.
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Will I see the fixings?

No, you won't. Our decking boards have seamless installation with hidden fixings.

How do I know how much decking I will need?

To work out how many decking boards and other fixtures and fittings you will need you will first need to take your measurements where you would like the decking to go. You can put these measurements into our online price calculator which will automatically work out what you need and allow you to easily checkout online. If you need any extra assistance you can always call our sales team on 0203 011 1661 or email info@alphadecking.co.uk

What colours do you have available?

We have 5 amazing colours to choose from. Our beautiful deep anthracite, ever popular grey, traditional teak and majestic oak and our new oyster beige colour boards.

Order your FREE Composite Decking Sample Box

Get a real feel and see the quality for yourself. Receive your sample within 2-3 working days. 1 Sample box per customer.

Includes all our 5 colours Grey, Anthracite, Teak, Oak & Oyster

Alpha Composite Decking is a wood-plastic composite decking (WPC ) that has a natural beauty and the feel of real wood. Choose natural looking woodgrain Alpha Composite Decking for an authentic alternative to timber decking without the maintenance.

It is engineered from an innovative composition of 60% FSC® certified wood reclaimed from post-industrial manufacturing and 40% recycled High Density Polyethylene. Using recycled wood polymer construction makes it so much more durable than timber. The low maintenance, life-proof durability and weather-resistant qualities are just some of the reasons why it is perfect for your decking garden.

All our composite decking is UV protected meaning it is durable under UV light. Scrubbing and staining your decking every year is a thing of the past with composite wood decking. Alpha decking comes in 5 natural shades that resists and slows down fading caused by air-pollutants and weather exposure. Our decking comes with an up to 15 year limited residential warranty against splits, splinters, rot and fungal decay. This low maintenance solution is therefore the perfect choice for any commercial space or residential garden deck.

You'll find our composite decking to be extremely resilient, and it can be used for simple garden projects or complex landscaping projects. Clever concealed fixings give a neat flawless finish which can be installed quickly and easily making Alpha composite decking the ideal choice.

We can supply composite decking throughout most of the UK and whether you’re a property owner looking to improve their garden or a tradesman looking for ongoing supply for your projects, get in touch.

Composite Decking FAQs

What are the main benefits of composite decking?

What does the 15 year warranty cover?

Will my decking colour fade?

Will I see the fixings?

No, you won't. Our decking boards have seamless installation with hidden fixings.

How do I know how much decking I will need?

What colours do you have available?

We have 5 amazing colours to choose from. Our beautiful deep anthracite, ever popular grey, traditional teak and majestic oak and our new oyster beige colour boards.

Composite Fencing FAQs

What is Composite Fencing?

Composite fencing, also known as WPC fencing (Wood Plastic Composite), is a modern creative alternative to traditional timber fencing. It’s made from a blend of recycled wood fibres sourced from post industrial pulp and high quality PE (polyethylene) plastics. This combination creates a strong, durable material that replicates the natural beauty of wood while offering superior weather resistance and minimal maintenance. Unlike timber, composite fence boards will not rot, warp, splinter, or require yearly painting or staining, making them a long term, eco friendly choice for modern gardens.

What are the benefits of composite fencing?

Alpha Decking's wood plastic composite (WPC) fencing needs, in most circumstances, nearly zero maintenance compared to traditional wood fencing options. You can say goodbye to yearly re-staining, re-painting and panel repair, saving you time and money year after year.

Our composite fencing panels are made from 60% recycled wood fibres and 40% recycled plastic, giving you an eco-friendly choice that outlasts timber. Resistant to rot, warping, splintering and cracking, they’re ideal for year-round weather.

We know and understand that a composite fence is more expensive than traditional wood as an initial investment, but over the lifetime of your new composite fencing, you'll be saving time and money vs wooden fences.

Can composite fence panels be cut to size?

Yes, they sure can! Composite fencing products can be easily cut to the required size using your usual woodworking tools.

Is composite fencing more expensive than timber fencing?

While the initial cost can be higher, homeowners save money long-term thanks to low maintenance – no staining, painting, or panel repairs required. In addition to this, our composite fencing carries a 15 year warranty protection.

What does Alpha Decking's 15 year warranty on composite fencing cover?

Alpha Decking's 15 year warranty protects against warping, cracking, splitting, rotting and fungal decay caused by manufacturing defects, when subject to normal use and proper installation.

You can find more information and the terms of our full warranty here.

How do I install composite fencing?

You have 3 options. Installation using our composite fence posts or aluminium fence posts installation using our u channel inserts for concrete post. These inserts which easily slot into your new or existing concrete posts allowing you to install our aspen composite fence panel slats or our willow composite fence panel slats. You can choose which option suits your fence installation best when purchasing your composite fence panel sets.

All of our composite fencing seamlessly and easily fits together using a tongue and groove system allowing you to make your fence up to your desire height.

How do I know how much fencing I will need?

If you need any extra assistance you can always call our helpful team on 0203 011 1661 or email info@alphadecking.co.uk.

What composite fence panel colours do you have available?

Our Aspen range composite fencing has 5 amazing colours to choose from these include a beautiful deep anthracite, our ever popular grey, traditional teak, majestic oak and our new charcoal colour slats. We also have our Willow range composite fencing that is available in 4 colours including anthracite, grey, oak and teak.

Structural Composite Joist 3.66m

Length 3.66m

Width 100mm

Thickness 50mm

Dispatched Fast via Royal Mail 24

FREE delivery via Royal Mail 24

Available to Order - Approx lead time 5-6 weeks

In Stock

Limited Stock. Orders over 9 bays will be a pre-order with delivery approx mid December

In Stock

Limited Stock. Orders over 9 posts will be a pre-order with delivery approx mid December

In Stock

Limited Stock. Orders over 90 slats will be pre-order with delivery mid December

In Stock

Limited Stock. Orders over 10 sets will be pre-order with delivery mid December

Temporarily Out of Stock

Temporarily Out of Stock

U Channel Inserts are temporarily out of stock.Pre-order with deliveries starting mid May. Secure your stock with a £100 deposit or order now online. For more information or to pay a deposit please contact our team

Anthracite 3.66m decking is temporarily out of stock.Pre-order with deliveries starting November. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Oyster 3.66m decking is temporarily out of stock.Pre-order with deliveries starting November. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Oak Slats are temporarily out of stock.Pre-order with deliveries starting mid August. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Grey Slats are temporarily out of stock.Pre-order with deliveries starting early July. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Charcoal Slats are temporarily out of stock.Pre-order with deliveries starting early July. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Anthracite Slats are temporarily out of stock.Pre-order with deliveries starting mid to late October. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Willow Anthracite Slats are temporarily out of stock.Pre-order with deliveries starting late May. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Aluminium posts are temporarily out of stock.Pre-order with deliveries starting January. Secure your stock with a £100 deposit or order now online. For more information or to pay a deposit please contact our team

Charcoal Posts 3m are temporarily out of stock.Pre-order with deliveries starting end of June. Secure your stock with a £100 deposit or order now online. For more information or to pay a deposit please contact our team

Oak 3.66m Decking is temporarily out of stock.Pre-order with deliveries starting mid-late April. Secure your stock with a £100 deposit or order now online. For more information or to pay a deposit please contact our team

Teak 3.66m Decking is temporarily out of stock.Pre-order with deliveries starting late June. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Pre-order - Delivery Mid JuneYou can secure your stock with a £100 deposit.For more information or to only pay a deposit please contact our team

Pre-order - Delivery Early JulyYou can secure your stock with a £100 deposit.For more information or to only pay a deposit please contact our team

inc vat

Area by Sqm

Don't know how much to order? Use free our decking calculator here

Product Overview

Specifications

Specifications

How many will I need?

Product Features

Product Features

Use our free decking calculator

Length (Meters)

Error

Width (Meters)

or enter the area in Sqm

You will need

Use of full decking calculator here

Composite Decking FAQs

What are the main benefits of composite decking?

What does the 15 year warranty cover?

Will my decking colour fade?

Will I see the fixings?

How do I know how much decking I will need?

What colours do you have available?

How fast and how much is delivery?

Order your FREE Composite Decking Sample Box

Get a real feel and see the quality for yourself. Receive your sample within 2-3 working days. 1 Sample box per customer.

£ 0.00

Additional Items you may need

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SALE 5% OFF

U Channel Inserts are temporarily out of stock.
Pre-order with deliveries starting mid May. Secure your stock with a £100 deposit or order now online. For more information or to pay a deposit please contact our team

Anthracite 3.66m decking is temporarily out of stock.
Pre-order with deliveries starting November. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Oyster 3.66m decking is temporarily out of stock.
Pre-order with deliveries starting November. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Oak Slats are temporarily out of stock.
Pre-order with deliveries starting mid August. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Grey Slats are temporarily out of stock.
Pre-order with deliveries starting early July. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Charcoal Slats are temporarily out of stock.
Pre-order with deliveries starting early July. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Anthracite Slats are temporarily out of stock.
Pre-order with deliveries starting mid to late October. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Willow Anthracite Slats are temporarily out of stock.
Pre-order with deliveries starting late May. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Aluminium posts are temporarily out of stock.
Pre-order with deliveries starting January. Secure your stock with a £100 deposit or order now online. For more information or to pay a deposit please contact our team

Charcoal Posts 3m are temporarily out of stock.
Pre-order with deliveries starting end of June. Secure your stock with a £100 deposit or order now online. For more information or to pay a deposit please contact our team

Oak 3.66m Decking is temporarily out of stock.
Pre-order with deliveries starting mid-late April. Secure your stock with a £100 deposit or order now online. For more information or to pay a deposit please contact our team

Teak 3.66m Decking is temporarily out of stock.
Pre-order with deliveries starting late June. Secure your stock with a £100 deposit or order online today. For more information or to pay a deposit please contact our team.

Pre-order - Delivery Mid June
You can secure your stock with a £100 deposit.
For more information or to only pay a deposit please contact our team

Pre-order - Delivery Early July
You can secure your stock with a £100 deposit.
For more information or to only pay a deposit please contact our team