Create a strip foundation for a garden shed


The strip foundation is used in several cases: as a single foundation strip, for example, for a garden wall, but also as a multi-strip foundation when building a house or as a substrate for a garden shed. What you need for a strip foundation, how to make it professionally and where you can use it sensibly, can be found here.

Background information

In the strip foundation, individual foundation strips lie in the frost-free area and usually support a thin foundation plate attached above. The structural loads are passed on from the foundation slab to the foundation strips, where they are discharged into the surrounding soil. This is a very stable construction.

Advantages of strip foundations

Point foundations are only suitable for relatively low structural loads - strip foundations, on the other hand, are highly resilient but must also be planned precisely. For non-basement houses, the architect or structural engineer designs a foundation plan that must be adhered to exactly. For larger garden sheds, the manufacturer usually already has a foundation plan for a suitable strip foundation.

Without a plan, you can apply the foundation strips to the outer edges of the planned foundation for simple floor plans and not too large ground surface, since in most cases the highest structural loads arise anyway along the outer walls. You should then pour the attached concrete slab a little thicker.

concrete production

Since in most cases a considerable amount of concrete is needed for a strip foundation, it makes sense to have concrete supplied in the right quality. You can then let it pump directly into the formwork, and not only get consistently good concrete quality but also a uniform contribution, which is very beneficial for the stability of the foundation plate.

Individual foundation strips

Of course, to build a garden wall, you only need a single foundation strip. Here, too, one speaks of a strip foundation.

Step-by-step instructions for a strip foundation for the garden shed

  • Gravel, frost-proof
  • PE film
  • concrete
  • Shuttering material and fastening for formwork
  • Reinforcement material if necessary - Reinforcing baskets and reinforcing mats
  • tie wire
  • spade
  • concrete Stampfer
  • spirit level
  • tape measure
  • rüttelplatte
  • Building foil for covering

1. Planning foundation and dumping the soil

If you have a foundation plan, first cut off the foundation area with mason's string and wooden pegs, and then mark the location of the foundation ditches in the same way. If there is no plan, set up the foundation ditches in the area of ​​the outer walls of the later garden house. The foundation ditches should be around 30 cm wide and at least 80 cm deep.

The first thing you do is lift the Edreich out to a depth of about 20 cm before excavating the foundation ditches. Check the correct position again.

2. Attach the formwork

You can now attach and fix the formwork of the foundation trenches and the foundation plate. Especially at the corners, you should also screw the formwork in addition.

Place a so-called cleanliness layer between the foundation trenches of a compacted gravel bed and PE film laid over it.

3. Pour in concrete

You can now pour the concrete into the finished formwork. That should happen as evenly as possible. First fill the foundation trenches and then pour the bottom plate in one piece.

It is recommended to apply the concrete in layers, and to compress the layers in between with the concrete tamper again and again. If you use reinforcements, you should already insert them before casting and tie them together with steel wire.

The concrete then has to harden for about fourteen days, depending on the type of concrete. To protect it from the weather, cover it with construction foil.

Tips & Tricks

Always apply concrete from one side only - this will allow it to spread better and make the concrete pavement smoother and more stable. You can, if you want, also pour a - correspondingly thicker - continuous foundation plate. This is a bit easier and also very stable.


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