Frequently Asked Questions

Our recommendation is to fill the honeycomb tiles with crushed gravel graded to between 5 mm (min.) and 10 mm (max.).

Natural stone, ceramic, composite materials, or decking boards can be used to cover the staircase. It is also possible to build a concrete formwork and then apply a façade cladding over it.

Your joist pedestals must be installed on a prepared, untreated ground surface or a concrete slab. We strongly advise against installing them directly on soil without stabilisation, due to the risk of settlement or ground movement caused by weather conditions (rain, drought) or the weight of the structure. Whether you are installing your pedestals on an unfinished ground surface or a concrete slab, the surface must be clean, stable and properly levelled to ensure a durable and secure decking.

Fixego® is an innovative invisible fixing system designed for installing wooden decking boards without visible screws. Fixego® provides an attractive, uniform finish and extends the life of your deck. UV, frost, and tear resistant, it is particularly suitable for renovation or board replacement projects.

When it comes to your raised patio, the choice of one type of edge finish over another depends mainly on your personal taste in outdoor design :

• For a look similar to a light or beige flooring, such as a travertine-effect finish, opt for the pearl white RAL 1013 profile.
• For a look with darker, grey-toned shades, choose the anthracite grey RAL 7016 profile.
• If you prefer an industrial or even metallic look, we recommend picking the aluminium grey profile range.
• If you prefer to keep the same colour as the tiles used on the rest of your patio, then we recommend going for a finish with cut-to-size tiles and using a side finishing plate and lateral riser support.

The spacing between the pedestals will depend on the type of wood and the cross-section of the joists you are using. As a general rule, we recommend a distance of 70 cm between each adjustable pedestal. For joists, we recommend a centre-to-centre distance of 50 cm if your decking is made of natural wood boards. Please note that these guidelines differ for a composite decking.

Yes, our self-levelling pedestals have an adjustable height to the nearest millimetre.

Our Essential pedestals have a height range of up to 485 mm when combined with risers. For the Cleman® range with dual adjustment, it is possible to adjust their height from 40 to 470 mm using a riser.

The Modulesca® step measures 17 cm high x 93.4 cm wide and 42.4 cm deep.

The 20 cm module measures 17 cm high x 20 cm wide and 42.4 cm deep.

Our block paving stabilisers can be used with all 15x15x6 cm high concrete block pavers. Stone and sandstone paving can also be used, although their higher cost makes them less common.

Jouplast 2mm flat packers are thin packers designed specifically for use where minimal packing is required. Their snappable design means they can be used in one-piece or snapped into 2 or 4 sections to provide 4 packers in 1. They also ensure excellent ventilation for timber decking structures, and comply fully with the minimum spacing requirement set by the French DTU 51.4 technical standard (3 mm between joist and decking board). Ultra-strong, they can support heavy loads with no deflection (crush resistance in excess of 2 tonnes).

The Jouplast® square gripper/isolation mat is an accessory designed to be applied to a paved side finishing plate. It damps any acoustic resonances and improves paving adhesion. It offers greater terrace stability and comfort.

The number of pedestals required depends on the total area to be covered and the format of the paving used:

• For a 20 m² paved terrace using 60 x 60 cm paving slabs: approximately 80 pedestals (4 pedestals per m²).
• For a 40 m² paved terrace using 80 x 80 cm paving slabs: approximately 280 pedestals (7 pedestals/m²).

The recommendations of the paving manufacturer must be followed in order to calculate the precise number of paving pedestals required.

Cleman® 28/40 pedestals can be installed only on stabilised ground or a precast concrete slab. They are not suitable for use on loose soil or unprepared ground and must be laid on a flat surface whose gradient must not exceed 1.5%.

Jouplast® ridged wedges are designed to wedge and level timber structures constructed indoors and outdoors. Their saw-tooth ridging system facilitates precise spacing and ensures maximum stability of joists, floors and other joinery. Available in two formats (90 mm and 170 mm), they provide adjustment from 11 to 40 mm, depending on the combination used. Compatible with flat packers, they are ultra-strong (crush resistance over 2 tonnes) and have moulded holes for easy fixing with no drilling needed.

Our solutions are adapted to all types of structure, including balconies, patios and sloping ground. Be careful to choose the right type of self-leveling riser pedestal for the gradient.

The paved side finishing plate support kit extender increases the height of the paving side cladding support by 20 mm. It is used to adjust the height beneath paving when installing terraces or other structures to ensure a flat finish and sufficient stability.

The Cleman® adjustment wrench can be used with straight or offset patterns of square and rectangular paving slabs, with the exception of 2/3 – 1/3 patterns. However, it cannot be used to adjust the height of the riser pedestals located under the longer sides of rectangular paving slabs, or with paving slabs thicker than 30 mm.

For an exotic wood deck, several species stand out for their durability, resistance to moisture, and aesthetics. Here are some of the best options:

• Ipé: Native to South America, Ipé is very dense and resistant. It is naturally rot-resistant and offers excellent durability against the elements.
• Cumaru: Also known as “Brazilian teak,” Cumaru is a hard wood with a beautiful color ranging from reddish-brown to yellow-brown. It is very stable and resistant.
• Teak: Known for its resistance to water and insects, teak is often used for decks and outdoor furniture. It has a beautiful golden color that can be maintained with regular care.
• Padauk: This African wood is very dense and durable, with a color ranging from red to pinkish-brown. It is also very stable and stain-resistant.

It is possible to build a straight staircase or a quarter-turn staircase.

For a straight staircase:

• Minimum ground slope: 24.7° or 46%
• Minimum tread depth: 235 mm
• Maximum ground slope: 36° or 70%
• Maximum tread depth: 370 mm

For a curved quarter-turn staircase:

• Rotation axis: Center of the step
• Minimum inner radius: 570 mm
• Minimum outer radius: 1,530 mm
• Maximum step rotation angle: 13°

Note: The curved staircase can be assembled independently on either the right or left side using the module.

Jouplast® decking joist pedestals have a crush test resistance of over 1 tonne. However, the weight that a raised decking can support depends not only on the strength of the pedestals and whether they have a high load resistance, but also on the type of wood used for the decking. We therefore advise you to consult your timber supplier for more precise information on this matter.

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