Five Steps to Decking Success

A successful decking project starts long before the first board is installed. From understanding site conditions to choosing the right materials and support system, decisions made early in the process can have a significant impact on installation, performance and long-term maintenance.

Here are five steps to help you get your next external decking project off to the right start.

1. Know your site

Start by understanding what's already there. A thorough site survey can identify existing levels, falls, drainage, substrate conditions and potential interfaces with other building elements.

At The Outdoor Deck Company, we always ask for project plans and photographs at the outset to help us understand the site and identify anything that might need further investigation. Establishing these details early on can help avoid unexpected challenges once installation is underway.

Sharing plans, photographs and details of existing conditions helps inform the decking design.

2. Establish the requirements

Factors such as fire safety and slip resistance should be considered from the outset.

For example, balconies may require non-combustible materials, while roof terraces can require a complete build-up tested to BROOF(t4). Understanding the fire requirements for balconies and roof terraces early on helps to narrow down the suitable materials and systems before detailed design begins.

Slip resistance is another important consideration, particularly in areas exposed to moisture. The HSE identifies a wet Pendulum Test Value (PTV) of 36 or above as indicating low slip potential on level surfaces. Slopes, steps and other site-specific conditions may require further assessment.

3. Design from the ground up

A deck is only as good as the system supporting it.

Sub-frames and pedestals play an important role in the performance and longevity of external decking. Choosing the right sub-frame is essential to ensuring the system can accommodate the project's loading requirements, available build-up height and site conditions.

Drainage must also be considered, alongside access for inspection and maintenance. On exposed or high-rise projects, wind uplift may introduce further design requirements.

Sub-frame design needs to account for how a space will be used.

At Corner House, closer joist centres were specified in one area to accommodate the anticipated load of a hot tub.

4. Select for the long term

The appearance of a decking material on installation day is only part of the picture.

Natural timber will develop a silver-grey appearance as it weathers, although regular maintenance will help retain more of its original colour. Other materials, including composite and porcelain decking, can offer greater colour stability alongside other benefits.

Understanding how different decking materials age can help you choose a surface that continues to meet the client's expectations over time.

5. Coordinate before construction

Decking rarely exists in isolation. It needs to work alongside waterproofing, thresholds, façades, balustrades, landscaping and other elements of the building.

Early coordination between the design team, contractors and decking supplier can help resolve these interfaces before work begins, avoiding clashes, delays and costly changes on site.

Getting it right from the start

Successful decking projects come from considering the complete system, not just the surface finish. By understanding the site, establishing requirements, selecting appropriate materials and coordinating the details early on, you can reduce risk during installation and deliver a deck that performs as intended for many years to come.

At The Outdoor Deck Company, we work with architects, specifiers and contractors from early design through to installation. Get in touch to discuss your next project.