Concrete slabs for swimming pools

Installing a wooden or composite pool in the garden of your home can be a long and tedious process. So you can move forward and not miss a day in the pool, we will briefly describe the steps necessary to fully enjoy the swimming season.


The installation of composite or wooden pools requires the intervention of at least two people and requires two days, apart from the preparation of the area and filling.


When choosing the place where we will place the pool, we must take into account that it isn’t:


· Under power lines,
· Under tree branches,
· Above uneven ground.


The pool should be in a sunny place, easily accessible, and in an area free of pipes or electrical connections.


Our advice is to mount the pool on a sunny day and avoiding windy days.


In addition to the location, we can install the pool according to the following options:

possibilities of Gre pools installation


Regardless of the type of installation, it’s necessary to excavate and prepare the area. For this we can do it:


Directly on the ground, after preparation, leveling … as long as it’s stabilized ground,

Prepare a concrete slab (cement…) according to the dimensions of the pool.


Our recommendation is to make a concrete base with fibers or a welded mesh.

Construction of a concrete slab for swimming pools

For both ground pools and for inground or semi-underground pools, a 17 cm thick concrete slab for wooden pools and 15 cm for a composite pools will be necessary.


parameters to build a concrete slab for swimming pools


The concrete should be 350 kg/m3 (standardized C125 430), or> 150 Kg/m2 for composite pools. The finish must be perfect and on a totally stabilized ground.


To know the weight that the concrete slab will support:

1000 liters of water = 1m3 = 1000 kg


Our recommendation is that a professional make the slab to ensure the dosing and homogeneity of materials and to pour it in the shortest possible time.


How to make the concrete slab for swimming pools

Depending on the area, it is important to implement a peripheral drainage to avoid water stagnation and avoid soil contamination and even the deterioration of the structure of the pool.


It is also necessary to connect a decompression well. The well is dug before the construction of the pool, because it can also prevent the excavations from filling up with water during construction. It must be near the pool vase, a few centimeters below the deepest point of the pool, and reach the surface. It must be placed on the wettest side, since it will act as a sink in case of water infiltration or clayey soil, since water rises faster through the pipe than from the ground


The filtration group must be at a minimum distance of 3.5m from the vase, and be below the level of the pool or at ground level.


If the pool will be completely or partially buried, you should increase the excavation by 50 cm around the perimeter to facilitate your own movements during assembly. Try to remove all wooden fragments and roots that may degrade over time.


Don’t install a formwork around the pool or near it with a wood that isn’t  treated to be in contact with the ground and don’t apply any additional treatment on the buried part


Use a protection roll and a PEHD alveolar drainage and place it with bubbles against the wall of the pool, so that the wood can “breathe”.

inground wooden pool installation


According to the measurements of the pool, between 7.5 and 9.6 m3 of concrete will be necessary.


The concrete slab must exceed the measurements of the pool vase by at least 25 cm. Take into account the exact measurements of the pool model to mark where it will be placed and where the joints will be on the concrete slab


The mesh of the concrete floor allows to improve the strength of the concrete and prevent it from breaking due to its rigidity. For better adhesion, it’s recommended to bend the ends of the mesh. The iron cannot be less than 30 mm from the outer edge of the work. You can use coves/bricks so that the mesh isn’t flush with the floor and is located approximately half of the slab.


Before pouring the concrete, according to the pool models, you must first place the structural system perfectly leveled (columns, interior framework, beams).

Place the frames at the bottom of the excavation according to the instructions in the manual and make sure that the vertical pieces are well plumbed so that when casting the concrete, they don’t move. Place the metal mesh adjusting it to the surface of the concrete slab. The base of the structure must be covered by concrete. Consult the instruction manual to learn more about this step.

Finished the concrete slab for swimming pools

Once the concrete slab is finished, it’s necessary to wait 3 weeks until the concrete slab dries completely to be able to continue the installation of the pool


Before beginning the installation of the pool, you must clean the slab to remove all impurities (gravel, branches, leaves) and eliminate irregularities of the surface.

Our advice is to assemble the structure of the pool in a single day.


As a protection for the pool vase or liner, we recommend the use of a protective blanket.


If you need help in the installation of your pool, visit our Authorized Technical Service


You can find more information and very interesting tutorials on our social networks, we are waiting for you!


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