How to Choose Pedestal Height for Different Terrace Projects

The pedestal height determines how the finished terrace connects with the house. If the surface is too high, it may block doors or create an unwanted step. If it is too low, the transition may become inconvenient, especially when entering and exiting the property.

For a garden terrace built close to ground level, installation on low pedestals is often the simplest solution.

If the existing substrate is relatively even and properly prepared, there may be no reason to significantly raise the finished surface. Short pedestals can provide the adjustment needed to correct minor level differences while creating adequate space beneath the surface.

Before choosing the height, check the following points:

• Is the substrate properly prepared and stable?
• Does the substrate have sufficient slope for water drainage?
• Is there sufficient clearance so that leaves and debris do not block the water drainage path?
• Will the finished terrace fit comfortably against garden doors or surrounding paths?

For this type of project, unnecessarily increasing the pedestal height can create extra work without providing practical benefits.

A low installation is often the right solution when site conditions allow it. As a manufacturer of adjustable pedestal systems, we recognize that the most suitable solution is not always the highest one. The goal is to achieve the required finished level with a stable and appropriate support configuration.

Sloping gardens present a different challenge. The ground may drop by several centimetres or more across the terrace area, while the finished surface or pavers must remain level.

Adjustable pedestals make this possible without having to raise the entire ground surface to the same level.

For example, imagine a five-metre-wide terrace in a garden with a clear slope. The pedestals on the higher side may only need a small extension, while those on the lower side require a much greater height.

It is important to calculate the required height at each support point rather than choosing a single extension size for the entire terrace.

When developing adjustable pedestal systems, we consider the extension range to be an important product feature. It determines how much ground level variation a given system can compensate for. Before selecting a pedestal, compare the required installation height with the product's minimum and maximum adjustment range.

Also consider the following:

• Whether the ground can hold the pedestal bases without shifting.
• Whether additional base plates or stabilising accessories are needed.
• Whether the supporting structure requires lateral bracing.
• Whether the selected pedestal can carry the expected loads at the required extension.

A sloping site may require different pedestal heights on the same terrace. This is normal, but every support point must remain stable.

Roof terraces and podium terraces usually require more careful planning, because the pedestal system sits above the structural slab and the waterproofing membrane.

The available height is often determined by several construction requirements. These include the position of drainage outlets, the location of the waterproofing layer, door thresholds, and the need for access to services beneath the finished surface.

A raised pedestal system can create a useful void between the surface and the roof structure. This space allows water to move towards drainage points and provides access to the membrane or other building elements when maintenance is required.

However, the required height should never be selected solely on the basis of drainage clearance.

Check the roof design, including:

• The thickness and location of the waterproofing system.
• The location and height of drainage outlets.
• The required drainage route beneath the terrace.
• Access requirements for inspection and maintenance purposes.
• The structural load-bearing capacity of the roof.
• The permissible height of the finished terrace.

See also: SPIRAL pedestal 50-70 mm with D5 for tiles

Higher roof installations also require particular attention to pedestal stability and wind-related design requirements. The complete support system must be suitable for the project, including any specified bracing, restraints or other fixing solutions.

For such installations, the structural designer and waterproofing specialist should confirm the requirements before the pedestal height is finally determined.

As a manufacturer of adjustable pedestals, we also recommend checking whether the selected product range is intended for the specific application. A system designed for low-level garden landscaping may not be suitable for a demanding roof installation.

Once you know the type of terrace, consider these five factors before choosing the support system.

In roof and podium projects, the space underneath may contain drainage pipes, electrical installations, or waterproofing elements. Make sure there is sufficient clearance for inspection and future maintenance.

Porcelain pavers, natural stone, decking boards and composite decking boards do not place the same demands on the support system. The weight of the finished surface, the supporting joists, if applicable, furniture, people and any additional project-specific loads must be taken into account.

The load capacity and the manufacturer's installation recommendations for the selected configuration should always be verified.

When comparing adjustable pedestal products from different manufacturers, pay attention to how the load capacity is determined and whether the stated value refers to a single pedestal or to a specific tested configuration.

The best pedestal height is the one that meets the requirements of the installation site without creating unnecessary complications.

A low garden terrace may require only minor adjustment. A sloping garden may require several pedestal heights within the same installation. A rooftop terrace may require additional clearance for drainage and maintenance, while a terrace in front of existing doors must be carefully measured to achieve the correct threshold transition.

Before placing an order, measure the distance from the prepared substrate to the target finished surface. Subtract the thickness of the pavers or deck boards, check the required drainage clearance, and compare the result with the pedestal's adjustment range.

As a manufacturer of adjustable pedestals, we believe that choosing the right support system starts with understanding the project, not with simply selecting a product based on its maximum height. Getting these measurements and specifications right at the outset makes installation easier and helps create a terrace that remains functional, level, and accessible for years.