Frequently Asked Questions

Depending on the nature of your soil and the intended use, there are three types of stabilisation possible:

• Without foundations: this method is possible for covered projects on well-drained or load-bearing soil with sufficient slope. It can be used for temporary projects.
• With minimal foundations : this method is recommended for moderately draining and load-bearing soils.
• Conventional foundations: this method is recommended for low-bearing and impermeable soils.

If in doubt, do not hesitate to ask a specialist for a geological analysis (drainage and load-bearing capacity) of your soil.

No, a composite decking installed on pedestals is not supposed to warp. The quality of the materials is, of course, paramount. Poor-quality products may expand under the effect of heat and contract under the effect of frost. Installation is extremely important and must be carried out properly. The boards must be secured correctly using the manufacturer’s fixing clips and spaced sufficiently apart to ensure the decking is ventilated.

Yes, ground preparation is essential before installing low-profile decking pedestals. Proper ground preparation guarantees the durability of the terrace and prevents the pedestals from moving over time. However, this ground preparation does not require major work.

On a concrete slab, make sure to remove any contamination that could hinder the installation and stability of the pedestals.

On raw ground, some simple earthworks will be necessary. Start by excavating the ground to obtain a flat base and ensure proper levelling. The use of geotextile and the creation of a foundation layer of crushed gravel are then essential to accommodate the low-profile adjustable pedestals in optimal conditions.

For installation on a waterproof surface, comply with the recommendations of DTU 43.1.

Our patio pedestals have a crush resistance of over 1 tonne. However, the weight that a wooden or paved patio can support does not depend solely on the strength of the pedestals.

Each type of flooring has its own load-bearing capacity. We therefore advise you to check with your timber or paver supplier for more precise information.

More generally, if you are planning to place a heavy item on your raised garden terrace, such as a hot tub, we recommend opting for our PROFILDECK® solution (aluminium joists), which will ensure better weight distribution across the structure of the raised patio.

Before buying pedestals, you need to choose the right size! Depending on the range of pedestals you choose, there are several sizes you can use to build your elevated patio.

Our paving pedestals are available in several sizes:

• The Essentiel standard range: adjustable pedestals from 8 to 20 mm, 20 to 30 mm, 20 to 40 mm, 50 to 80 mm, 80 to 140 mm and 140 to 230 mm. You can add Essentiel risers of 10 mm, 25 mm or 60 mm to certain pedestals. With the 140/230 mm pedestal and four 60 mm risers, you can reach a maximum height of 470 mm.
• The Essentiel self-levelling range: adjustable pedestals from 29 to 39 mm, 55 to 75 mm, 65 to 95 mm, 95 to 155 mm and 155 to 245 mm. The 10 mm and 60 mm Essentiel risers are also compatible with some of these pedestal sizes. With the 155/245 mm pedestal and 4 x 60 mm risers, a height of 485 mm can be achieved.
• The Cleman® standard range: adjustable pedestals from 28 to 40 mm, 40 to 55 mm, 55 to 80 mm, and 80 to 130 mm. All these pedestal sizes are compatible with the 60 mm Cleman® riser. By using 4 risers together with the largest pedestal, you can achieve a maximum height of 470 mm.
• The Cleman® self-levelling range: adjustable pedestals from 40 to 55 mm, 55 to 80 mm, 80 to 130 mm and 130 to 230 mm. Just like the standard Cleman pedestal, all sizes of the Cleman self-levelling pedestal are compatible with the 60 mm Cleman riser. By adding 4 risers to the largest pedestal size, you can achieve a height of up to 470 mm for your patio.
• The PLOGOM® : the Plogom® pedestal is only available in a single size of 10 mm.

Our decking pedestals also come in several sizes:

• Essentiel standard joist pedestal support: adjustable from 8 to 20 mm (the smallest joist pedestal on the market), 20 to 30 mm, 20 to 40 mm, 40 to 60 mm, 50 to 80 mm, 80 to 140 mm and 140 to 230 mm. Some of these pedestals are compatible with the 10 mm and 60 mm Essentiel risers. By adding 4 risers to the largest pedestal, you can achieve a maximum height of 470 mm for your timber or composite decking.
• Easio® pedestals: adjustable pedestals from 40 to 55 mm, 55 to 80 mm, 80 to 130 mm and 130 to 230 mm. These different pedestal sizes are all compatible with the 60 mm Easio® riser. By choosing the 130/230 mm pedestal and adding 4 risers, you can then build a 470 mm decking (excluding joists and decking boards).
• Elevo® pedestal: available in a single model, height-adjustable from 43 to 138 mm. This pedestal is also compatible with the 10 mm and 60 mm Essentiel risers.

Our paver stabilizer is compatible with all concrete pavers measuring 15×15 cm and 6 cm in height. It can also be used with interlocking stone or sandstone pavers, although these are less common due to their higher cost.

We recommend using pavers with smooth sides and without lugs. The pavers should not be aged, as they often have irregularities due to impacts they have received. While these irregularities can give them a unique and aesthetic appearance, they make the installation and movement on our paver stabilizing plates unstable.

According to the NF EN 1338 standard, the manufacturing tolerance is +/- 3 mm for a dimension of 150 mm. This type of paver is readily available in large DIY stores or from material suppliers.

Stone, concrete and ceramic tile paving are all options for riser pedestal terraces. Ultimately, the choice will depend on the intended use, laying pattern and, of course, the desired visual appearance of your paved terrace.

It is perfectly possible to install these pedestals on well-prepared uneven ground. They work equally well on existing concrete slabs, and can be installed immediately adjacent to existing installations with no problem.

These wedges are used directly beneath joists or any other joinery components requiring height adjustment. There are a number of rules governing their positioning:

• Provide clearance of at least 10 mm where joists are laid parallel to the direction of water flow; 20 mm where joists are laid at right angles to the direction of water flow.
• Leave the recommended spacing of 70 cm between wedges (depending on joist cross-section and type of timber).
• Space joists at 50 cm centres when using natural timber decking boards, and at 40 cm centres when using composite boards (check with the manufacturer).

Wedges can be screwed, glued or nailed in place to ensure optimum fixing.

Ideal for laying create tiled, ceramic or paved terraces, the Cleman® self-levelling 80/130 pedestal can be used to correct gradients of up to 5% on uneven ground. Its height adjustability provides greater flexibility for adapting terrace structures to project site constraints and the height of terrace required.

The Cleman® adjustable 40/55 paving pedestal is used to create tiled, ceramic or paved terraces for pedestrian use. It offers 3 adjustment options: pre-setting using the driver bit, manual setting using the screw adjuster, and final adjustment using the special adjustment wrench, all of which enables an extremely precise level of height adjustment. It offers not only fast and structurally stable installation, but also optimised side cladding facilitated by the 2 supports integrated into the base flange. This pedestal is compatible with self-supporting paving compliant with French classification T7, T11, or F+. It is not suitable for use with the paved side finishing plate.

Once the deck boards have been laid in accordance with French building regulation DTU 51.4., Profildeck® screws are screwed directly through the decking board and into the aluminium joist, using a maximum torque rating of 7 Nm (position “18” on a 20-position 18V cordless combi drill). It is important to check that the screws are compatible with the material used, particularly in the case of composite decking boards, which may require specific fixing methods.

The Jouplast® Elevo decking pedestal for metal posts can be installed on all types of ground, including slopes and loose or uneven ground. It is ideal for sites where traditional preparation (excavation, concrete slab casting etc.) is not feasible, and enables quick and stable construction.

3mm stabilising spacers are inserted between paving slabs as they are laid. They can also be used in combination as intersection spacers, depending on the configuration of your installation. Once installation is complete, the spacers can be removed for a sleek final finish.

The Cleman® and Easio® pedestal height extender adds 60 mm to the initial pedestal height. By stacking up to 4 height extenders, the initial height can be increased by total of 240 mm.

Simple and fast to install, MODULESCA® 20 cm steps require only two tools: a screwdriver and a spirit level. Having first prepared the ground, simply position the first step in the desired location, screw it in place and fill the module with aggregate or concrete. Each subsequent step is then easily assembled using the notch and slider system and the screws supplied to lock the modules securely together. For curving steps, the maximum angle of rotation for a 20 cm module is 10°.

ouplast® breakable flat shims are designed for low-height adjustments.

Available in various thicknesses (2, 3, and 5 mm), they are ideal for leveling carpentry elements, compensating for irregularities, and ensuring proper spacing between materials.

Their divisible design offers great flexibility and adapts to the specific requirements of each project. They provide excellent stability and high compressive strength.

All our slabs can withstand weights that are perfectly reasonable for traffic:

• Alveplac® and Greenplac® can withstand up to 600T/m² filled with gravel or grass.
• Urbangravel® can withstand up to 800T/m² filled with gravel.
• The entire URBANIT® range, designed for more intensive vehicle traffic, can withstand up to 1000T/m² filled with grass, gravel or paving stones.

The mechanical strength of our slabs is the fundamental criterion in our development process in order to guarantee soil stability.

Our self-levelling pedestals can be installed on uneven ground, as long as the ground has been properly prepared. They also work on existing concrete slabs, and it is very convenient to be able to install them against an existing structure without any difficulty.

Low-profile pedestals can only be used on flat, level floors with no difference in level exceeding 1.5%. In addition, pedestals can only be installed on stabilised ground or existing concrete slabs.

Is your floor uneven? Don’t panic, you can fix this by following a few simple floor preparation steps. For more information, please refer to our installation advice documents.