Dig a pool


The swimming pool is becoming more and more popular in this country. As preparation for a pool has to be done anyway, many also consider digging in the pool due to aesthetic considerations. What has to be considered when digging in a pool, you can read in the following guide.

Selection of a suitable burial pool

Before you think about digging in a pool, however, you must know which pool is suitable at all. Therefore, you should already consider the topic before you buy the pool. Typical are the following constructions:

  • Steel Frame Pool
  • Steel wall pool
  • GRP Pool

Material expenditure for the digging of the pool

If you want to dig a pool, only the steel wall pool is suitable. In addition to the pool you need other building materials and materials. This includes all ingredients for lean concrete, ie cement, mixing water, aggregate, as well as polystyrene plates and gravel for a dewatering layer under the later base plate.

Making the pool floor plate and a backfill

First, a base plate of appropriate thickness (10 to 15 cm) is applied. Below that, drainage must be guaranteed. Especially in winter, when the water is drained from the pool, there is a risk that it freezes through the bottom plate. To the circumference of the pool is still the diameter of a circulating lean concrete backfill with a thickness of 14 cm, so a total of 30 cm more diameter. In addition, there is the measure of the polystyrene plates, which are installed between steel wall and lean concrete.

Why lean concrete for the backfilling of the pool?

Lean concrete is produced in a ratio of cement to aggregate 1: 8, ie eight parts surcharge on a part of cement. In this case, the ratio of water to cement is approximately 1.2: 1. Lean concrete is used wherever it is ground-contacted or embedded in the ground when compressive strength is a requirement. When digging in the pool exactly this compressive strength is crucial. For most pools, the depth and thus the amount of water is similar. On average, it can be assumed that 1,5 tons act on 1 square meter - at least.

Setting the cement

After the floor slab is finished, it requires several weeks for setting depending on the weather conditions and the mixing ratio of the cement to mixing water and aggregate. The concrete is to be manufactured so that the standard strength is produced after 28 days. At the pit depth, it should also be noted that the handrail must remain free.

Dressing the steel wall with polystyrene

Now the outside of the pool steel wall is covered with the polystyrene plates (Styropor, Syrodur). Then the backfilling is done with lean concrete. Even this lean concrete must first set and harden again for many weeks.

Pool pump - above the water level or in the pump shaft

The pool pump depends on how it works. However, a pump should be used which is also usable above the water level. You can also create a pump shaft. However, it will always come to moisture here, which will clog the pump in any case and limit the life.

Tips & Tricks

Under no circumstances can you dispense with the floor slab and backfill of the buried pool with concrete. Even if you think the soil or subsoil is extremely strong, the massive pressure of the water will definitely cause it to deform. These are usually found after about a year.

Tips & Tricks

Make sure that the steel walls for a pool to be buried are at least 4 mm thick. In addition, you should choose a pool model in which the film is correspondingly easy to replace. Pools in which the handrail first has to be dismantled lead to a higher outlay.


Video Board: Building your Pool Pt 1: Digging a Pool