Crucial tips for successfully installing terraces on adjustable terrace pedestals

Building a terrace is an excellent way to add value to your outdoor space. Installing a terrace on adjustable pedestals has become a fast, simple and durable solution. Whether you choose ceramic tiles, wooden decking boards or composite, this practical guide takes you through every step of your terrace project. Discover our tips for a successful installation, from preparing the ground to maintaining your new terrace.

1. How do you prepare the ground for a terrace on pedestals?

The stability of the structure starts with proper ground preparation. A correctly prepared base ensures the durability of the terrace and makes installation considerably easier.

• On soft ground (soil, grass): Groundwork is required. First excavate the soil to a depth of at least 15 cm. Then install a geotextile membrane to prevent weed growth and rising moisture. Next, add a draining foundation layer of approximately 15 cm, for example gravel or crushed stone. Compact the entire surface carefully to create a stable and level base.
• On a concrete slab: If you already have a concrete slab, check that it is clean and in good condition. A minimum slope of 1.5% is recommended to ensure proper drainage of rainwater. If this slope is not present, you can add a small foundation layer or use slope correctors to compensate for differences in level.

Proper preparation of the ground is essential to prevent subsidence and ensure optimum stability of your terrace.

2. Which materials should you use for the terrace?

The choice of materials is crucial and depends on your budget, the desired appearance and the required strength.

• The pedestals: Adjustable polypropylene pedestals are the standard solution. They allow you to easily adjust the height of the structure — check the minimum and maximum height for each product — and compensate for irregularities in the ground. For tiles, use a pedestal with a specific top plate. For a wooden or composite terrace, a different top plate is required, such as the CPV+.
• The supporting structure: Aluminium support profiles such as Structusol or Deqsol form the framework on which large-format tiles or wooden decking boards can easily be installed.
• The terrace covering:
  • Tiles: Ceramic tiles, natural stone, concrete, etc. There is a wide range of options. Pay close attention to the thickness: at least 20 mm for ceramic tiles and 30 mm for natural stone.
  • Decking boards: Natural wood such as pine or exotic hardwood creates a warm appearance but requires regular maintenance. Composite decking is an attractive alternative: it is low-maintenance and resistant to moisture and UV radiation.

Feel free to browse the Solidor catalogue to discover our range of products for every type of terrace project.

3. What is the correct installation method? Step by step

Installing a terrace on pedestals is relatively straightforward and can also be carried out by an experienced DIY enthusiast. Follow the steps below.

Step 1: Preparation and installation plan

Before positioning the pedestals, first determine exactly where they need to be placed. The distance between the pedestals depends on the size of the tiles or the cross-section of the supporting joists. As a general rule, the spacing is between 50 and 70 cm, depending on the selected tile or wooden joist. A good installation plan also allows you to calculate precisely how many pedestals you will need.

Step 2: How do you install adjustable pedestals?

Place the pedestals directly on the stabilised ground or concrete slab at the predetermined positions. The pedestals are adjusted manually. Using the adjustment ring, you can adjust the height of each pedestal individually to create a perfectly level surface.

Step 3: Fixing the joists for a wooden or composite terrace

Once the pedestals have been correctly positioned and adjusted, attach the joists to the top plate of the pedestals. Carefully check that the entire supporting structure is stable and level before continuing.

Step 4: Installing decking boards or tiles

• For a wooden or composite terrace: Install the decking boards perpendicular to the joists. Start with the first wooden board along the wall and allow sufficient expansion space. Secure the boards using decking screws or concealed fixing clips. A circular saw is generally required to cut the boards to size.
• For a tiled terrace: Installation is even easier. The tiles are placed directly onto the top plate of the pedestals. The spacers on the top plate ensure a consistent joint width and keep the tiles securely in position.

4. How do you ensure the stability of the terrace?

The stability of a terrace installed on pedestals depends on several important factors:

• A properly prepared base: This forms the foundation of your terrace structure.
• The correct spacing: Proper spacing between the pedestals and support profiles is essential.
• Correct adjustment of the pedestals: Never extend a pedestal beyond the maximum recommended height.
• Securing the joists: The joists must be firmly attached to the pedestals.
• An edge support: Along a wall, a finishing accessory can be used to improve lateral stability.

5. How do you maintain a terrace on pedestals?

One of the main advantages of this installation system is its easy maintenance.

• Cleaning: A simple clean with water and a stiff brush once or twice a year is usually sufficient.
• Protection: For a terrace made of natural wood, applying a saturating treatment or protective oil once a year can help preserve the colour for longer and protect the wood against moisture and UV radiation.
• Inspection: The space underneath the terrace remains accessible. This makes it easy to check the condition of the structure and remove leaves or other debris that may have accumulated beneath the terrace.

By following these tips, you are fully prepared to create the terrace of your dreams: a durable and stylish outdoor space, whether for a small garden or a large-scale terrace project.