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Expert Guide: Composite Decking

Weather Strong Deck Tape (5)

If you’re considering upgrading your garden or balcony, you may have encountered a modern alternative to traditional timber: composite decking. While LB Roof Windows is your go-to source for bringing light into your home, we understand that the exterior of your property is equally important for creating a seamless living space. 

In this expert guide, we’ll address the most common questions: what is composite decking, how do you maintain it, and, most importantly, should you invest in it?

What is Composite Decking? 

To appreciate the benefits, we first need to define the material. So, what is composite decking? Simply put, it is an artificial building product crafted from a unique blend of wood fibres, plastics (usually recycled HDPE), and bonding agents. 

Unlike traditional wood, which is cut directly from trees, composite boards are engineered to resist the elements. This results in a product that looks like natural wood but offers significantly higher durability and lower maintenance.

How Long Does Composite Decking Last? 

One of the biggest selling points for homeowners is longevity. So, how long can you expect composite decking to last? 

While a standard pressure-treated timber deck may start to rot or warp within 10 to 15 years, a high-quality composite deck can easily last 25 to 30 years or more. Most premium manufacturers even provide 25-year warranties against fading and staining. Because the material is resistant to moisture, insects, and UV rays, it won’t splinter or decay over time.

Maintenance: How to Clean Composite Decking 

A common question we receive is about how to clean composite decking boards. The good news is that, unlike timber, you never need to sand, stain, or oil a composite deck.

How to Clean Composite Decking: A Quick Step-by-Step Guide

To keep your outdoor space looking brand new, follow these simple steps twice a year:

  1. Clear the Debris: Sweep away leaves and dirt with a soft-bristled broom.
  2. Soapy Water: Mix warm water with mild dish soap. Avoid harsh chemicals or bleach.
  3. Soft Scrub: Use a soft brush to scrub the surface of the boards, following the grain of the artificial wood.
  4. Rinse: Use a garden hose to rinse the boards thoroughly.

Note: If you decide to use a pressure washer, keep it on a low setting and maintain at least 30 cm distance from the surface to avoid damaging the protective “cap” of the boards.

Cost Analysis: How Much Does Composite Decking Cost? 

When planning a garden renovation, budget is always a priority. How much does composite decking cost? 

Initially, composite decking tends to be more expensive than softwood timber. On average, you can expect to pay:

  • Timber: ÂŁ15 – ÂŁ25 per square metre.
  • Composite: ÂŁ40 – ÂŁ85+ per square metre.

However, the “true cost” should be assessed over the product’s lifetime. When you consider the savings from avoiding expensive oils, stains, and the replacement costs of rotted wood, composite decking often becomes the more economical choice after 8 to 10 years.

Final Thoughts: Is Composite Decking Right for You?

Composite decking is an excellent option for busy homeowners who desire a beautiful outdoor space without the time-consuming maintenance associated with traditional wood. It’s eco-friendly, durable, and adds significant value to your property. 

Whether you’re installing a new roof window to overlook your garden or building a deck to enjoy the view, quality materials truly make a difference.

Written by: Joe

Published on: 14 March 2026

Categories: Advice, Guides