Rectangular wooden pools

Rectangular wooden pools require a perfectly level reinforced concrete slab between 15 and 20 centimeters thick. Due to the length of their straight walls, the pressure of the water exerts an extreme lateral force that cannot be contained by assembled wood alone without lower anchoring.

During the concrete pour, it is essential to secure the IPE structural metal beams supplied in the kit. These steel cradles are integrated into the base slab and hold the vertical uprights that prevent the pool shell from bulging. Omitting this slab voids the manufacturer's structural warranty and compromises the integrity of the 75/100 liner.

Partially buried installation requires isolating the wood from direct contact with the surrounding soil by means of a studded drainage membrane, such as a perimeter drainage membrane. Although Scots pine has class IV autoclave treatment, stagnant moisture accelerates surface biological deterioration.

Follow these essential construction steps:

• Excavate, leaving an additional 30 centimeters around the perimeter beyond the pool's outer dimensions.
• Pour the level base slab, securing the metal reinforcement wedges.
• Place a geotextile barrier and polyethylene membrane with studs against the external wooden walls.
• Fill the external gap with washed river gravel and connect a drainage pipe to an outlet.

Consult our catalog of wooden pools to check the burial diagrams for each model.

Class IV autoclave-treated Scots pine is a solid natural product pressure-impregnated with copper salts, while composite combines plastic resins with plant fibers. Nordic pine provides tactile warmth, withstands direct impacts without breaking, and allows mechanical repairs by sanding or replacing individual boards.

Composite, on the other hand, does not require a surface stain for solar protection, but it undergoes greater thermal expansion in climates with sharp temperature fluctuations. In large rectangular models, the elasticity of treated Scots pine handles the microtensions transmitted by the tons of water accumulated against the side walls more effectively.

High-end rectangular models include a 75/100-thick (0.75 mm) blue or gray liner made from virgin PVC stabilized against ultraviolet radiation. This thickness doubles the usual mechanical resistance of standard above-ground sheet-metal pools.

The installation includes two high-density geotextile protective mats:

• 200 g/m² floor mat that cushions footsteps and neutralizes imperfections in the concrete.
• Geotextile protector for the wooden walls, preventing pinching or abrasion between the PVC and the natural knots in the structural wood.

For continuous disinfection without discoloring the liner, we supply skimmers compatible with a basket for holding the chlorine treatment.

A sand filtration system with a minimum flow rate of 8 to 10 cubic meters per hour is the standard configuration for rectangular wooden pools of more than 20,000 liters. The orthogonal geometry causes sediment to accumulate in the four corners, requiring greater hydraulic power to recirculate the water toward the skimmer.

To ensure optimal retention of fine particles, we recommend filter units with a 400 to 500 mm diameter tank loaded with filter glass or silica sand measuring 0.4 to 0.8 mm. You can automate cleaning by connecting a hydraulic pool cleaner such as the Zodiac MX8 automatic pool cleaner for pools directly to the suction inlet.

Class IV autoclave treatment permanently protects the wood against rot without the need to apply protective varnishes to the interior. However, solar radiation causes a superficial grayish oxidation on the exterior that does not affect structural strength.

To preserve the original tone of the Scots pine in 2026, carry out the following annual maintenance tasks:

• Clean beforehand with low-pressure water and neutral soap at the beginning of spring.
• Apply one coat of open-pore water-repellent wood stain without aggressive sanding.
• Check the tightness of the stainless steel hardware and joining profiles.
• Check the seal at the skimmer sealing joint and return nozzles.

Rectangular structures provide a combination of two separate ladders to balance exterior aesthetics and swimmer safety. The exterior has a removable or folding treated wooden ladder, while the interior is equipped with stainless steel steps with nonslip pads.

Removing the exterior ladder when the pool is unsupervised prevents small children from accidentally accessing the bathing platform. If you decide to install the structure fully above ground without burying it, make sure the surrounding base is free of auxiliary climbable elements within at least 1.5 meters in every direction.