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How to Lay Composite Decking


Reading time: 4 minutes

Installing composite decking is a straightforward process, depending on the space you’re fitting it in, and whether you want your decking in the sun or the shade. When it comes to the installation, it’s good to be prepared. This article gives general guidance on what to look out for when fitting composite decking.  

However, for detailed instructions on preparation, fitting and aftercare, always consult the decking manufacturer’s guidance. Not only will this ensure correct installation, it will also help you to fit your decking without potentially voiding any warranties.

While rare, there might also be cases where planning permission is required. Check your local council for further advice.

Decking tools you’ll need

How do you build a deck frame for composite decking?

Timber will provide the basic framework of your composite decking subframe, arranged in rows. When building a composite decking framework, use structurally treated timber for durability in all weathers.
Try to avoid building timber frames and joists in wet weather. Even with treating and damp-proofing this might lead to some distortion to the wood that can throw off your measurements.

There are different methods in approaching how to build a decking frame. This can vary depending on space, how level the ground is and so on. Guidance for planning your subframe, and how to lay composite joists, is as follows:

  • Fitting the frame
  • Fitting the joists
  • Laying Decking Boards
  • Finishing Composite Decking

This guidance should give you an idea on how to prepare, and the steps to consider, when building your new decking. However, there are variations in styles and designs in composite decking, so as previously mentioned, follow manufacturer’s instructions and guidelines for details on laying decking.

If you want to know more about the benefits of composite decking and aftercare, we have more gardening articles for you to read up on!


Disclaimer: The information contained on this page is intended as an overall introduction and is not intended as specific advice from a qualified professional. Travis Perkins aims to avoid, but accepts no liability, in the case that any information stated is out of date.

Always refer to the manufacturer's guidance and installation instructions.