Strip foundation Create floor plate

Regardless of whether you produce a floor slab for a non-basement house or for a garden shed: in frost-prone soils, a corresponding frost protection must always be installed. As a rule, you should therefore create a strip foundation instead of a continuous floor slab.

Background information

A strip foundation consists of a slightly thinner base plate, which is supported from below by so-called foundation strips. These foundation strips extend into the frost-free layer of the soil - ie up to 80 cm deep.

Location of the foundation strips

Where the foundation strips have to be created, the architect or the structural engineer decides in the foundation plan for houses. You absolutely must keep to this plan exactly, otherwise the building loads will not be removed correctly, and thus the stability of the building is endangered.

Strip foundation Create floor plate: strip

If there is no foundation plan - for example in garden sheds or in a self-designed garage - you should install the foundation strips in the area of ​​the outer walls. The width of the foundation strips must correspond at least to the wall thickness.

Step-by-step instructions for casting a strip foundation

  • Gravel for the cleanliness layer
  • concrete
  • Maurer cord
  • wooden stakes
  • PE film
  • formwork
  • Reinforcement material if necessary
  • rüttelplatte
  • concrete Stampfer
  • straightedge
  • Construction film
  • Tool for fixing the formwork

1. Lift foundation area

In the area of ​​the planned floor slab you first carry around 20 cm of earth. Then you can excavate the foundation ditches. In order to maintain a correct flight and the correct dimensions, you can use a batter board.

2. The cleanliness layer

Now pour a gravel bed between the foundation strips, which you carefully compact with the vibrating plate and overlap with PE film.

3. Build formwork

Now erect the formwork for the floor slab. How thick your floor slab must be is specified in the foundation plan - otherwise you should definitely pour it about 15 cm thick for safety's sake. It is best to consult an architect or structural engineer who can give you a reliable indication here.

4. Pour the strip foundation

When the formwork has been completed, lay out the reinforcement mats and fix them with tie wire. Then you can start pouring in the concrete. Be sure to compress it evenly and allow air bubbles to escape. Then remove the finished floor slab, remove the formwork and cover the floor slab with construction foil to protect it from the effects of the weather.

Tips & Tricks

Sometimes, instead of the strip foundation, a so-called frost apron is used: here, the foundation strips lie on the outer edge of a continuously cast floor slab, which then has to be significantly thicker.

Video Board: 'Strip Foundation' - Excavation & Reinforcement