In-Depth Foundation Construction And Installation for Padel Courts

As players race across the padel court during a spirited game of padel, few realize that beneath the smooth blue turf beneath their feet lies a sophisticated "subterranean structure."

As the popularity of padel continues to soar, an increasing number of newly constructed courts are coming into service. However, two or three years down the line, some operators begin to encounter thorny issues such as the need for court refurbishment, ground subsidence, and water accumulation. Consequently, a long-overlooked truth has surfaced: the foundation is the fundamental code that ultimately determines a court's lifespan. Indeed, a common adage within the industry puts it this way: "The turf is the face; the foundation is the soul. You can replace the face, but if the soul is ruined, the whole thing is lost."

Today, we will peel back that layer of artificial turf—delving 30 centimeters beneath the surface—to fully reveal the six-layer construction principles that underpin the foundation of a professional padel court.

Original Soil Clearing and Subsoil Compaction

The first step of construction involves a comprehensive clearing of the native ground. The construction team must strip away all loose topsoil and organic-rich layers until a firm subsoil layer is exposed. Either dense sandy soil or a stable gravel layer constitutes a suitable foundation base.

Once the clearing is complete, two critical operations must be performed.

First, the edges of the site must be graded to create a slight slope; this serves as the primary line of defense for the drainage system, ensuring the efficient runoff of rainwater.

Second, the subsoil must be compacted using a road roller weighing at least 2.5 tons to eliminate the risk of future settlement. Many instances of uneven settlement that manifest later on can often be traced back to insufficient compaction of the native soil or a failure to properly grade the site edges.

Backfill Construction and Drainage System Installation

When excavation depth exceeds 20 centimeters, backfilling must be performed using sand or crushed stone, with the backfill layer maintained at a thickness of approximately 10 centimeters. The primary objective of this step is to ensure that, upon completion, the surface of the site sits 5 centimeters higher than the surrounding ground level, thereby creating an effective barrier against rainwater backflow and water accumulation within the subgrade.

For sites situated in low-lying areas or those with high soil moisture levels, a drainage pipe network must be pre-installed. The main drainage pipe should be laid along the perimeter of the site, while 3 to 4 collection points are distributed evenly across the interior; the pipes are buried at a depth of 50 to 60 centimeters, relying on gravity to facilitate drainage. During construction, particular attention must be paid to ensuring tight connections at all pipe joints; furthermore, during the backfilling process, care must be taken to prevent sharp stones from coming into direct contact with the pipe walls, thereby avoiding pipe damage that could lead to future leaks and increased maintenance costs.

Geotextile Installation and Crushed Stone Base Construction

A geotextile layer is installed between the subsoil and the crushed stone layer; its primary functions are separation and drainage. The separation function prevents the intermingling of the upper crushed stone layer and the underlying soil, while the drainage function ensures that moisture permeates vertically, thereby preventing lateral water retention.

The coarse crushed stone load-bearing layer constitutes the primary load-bearing structure of the foundation. Its construction parameters are as follows: a thickness of 20–25 cm, a particle size of 16–32 mm, and a material composition of either limestone or granite. The crushed stone must be angular in shape, and the permissible silt content is strictly zero. The rationale for selecting angular crushed stone is that, during compaction, the particles interlock to form a stable structure; conversely, rounded gravel tends to slide against itself, making effective compaction difficult, and sites constructed using rounded gravel are prone to developing wave-like settlement over time.

Upon completion of the crushed stone layer installation, it is recommended to employ a 7-ton class road roller for compaction to ensure that the layer achieves the specified design density.

Boundary Solidification of Reinforced Concrete Perimeter Beams

Upon completion of the gravel layer compaction, a reinforced concrete perimeter beam is cast around the entire site. The beam features a cross-section of 35 cm × 35 cm, enclosing an interior space strictly maintained at 10.00 m × 20.00 m to serve as the boundary for the artificial turf installation. During construction, the lengths of the two diagonals must be verified to ensure they are equal—with a tolerance controlled to the millimeter level—thereby guaranteeing that the site forms a perfect rectangle. The top edge of the perimeter beam stands 9–10 cm above the surface of the base layer; this serves to protect the edges of the turf and acts as the anchoring foundation for the perimeter fencing posts.

The perimeter fencing posts must be installed only after the base layer construction has been completed. During the installation process, protective sheeting or boards must be laid down to prevent any damage to the surface layer. Any damage sustained by the surface layer could potentially evolve into a latent quality defect in the future.

The Final Step: Surface Construction

The thickness of the fine crushed stone bedding layer is 3–4 cm, utilizing aggregates with a particle size of either 4–8 mm or 4–16 mm. The function of this layer is to prevent fine materials from the surface layer from being washed down into the coarse crushed stone base during rainfall, thereby avoiding the formation of structural voids.

Two options are available for the construction of the surface layer:

The First Option for the Surface Layer of a Padel Tennis Court: An emery layer. This utilizes machine-made granite sand with a particle size of 0–8 mm and a thickness of 5–6 cm. During construction, the surface must be kept flush with the upper edge of the perimeter curb. The flatness requirement stipulates that, when checked with a 3-meter straightedge, the deviation must not exceed 5–6 mm. This option offers lower costs but entails a longer construction period.

The Second Option for the Surface Layer of a Padel Tennis Court: A permeable asphalt layer. This employs open-graded permeable asphalt concrete with a thickness of 5–6 cm. It requires the use of a specialized asphalt paver to be laid and formed in a single pass. While the cost is higher, the construction period is shorter, and the flatness of the surface is more reliably ensured. In the absence of a laser-guided paver, the emery layer can be constructed using the "pipe-control method": two parallel steel pipes are laid down to serve as thickness guides; sand is filled between them and compacted, after which the pipes are removed and the resulting voids are filled and leveled. This process is repeated and refined until the required standards are met.

Particular attention must be paid to the selection of surface layer materials: the use of limestone-based emery or sand containing clay is strictly prohibited. Over time, such materials tend to harden and lose their permeability, leading to water accumulation on the site.