Point foundations are used everywhere where not too heavy building loads are to be discharged into the soil as effectively and cost-effectively as possible. A point foundation can be constructed differently. What options you have, what you need for a point foundation, and how to proceed step by step, you can find out here.
Point foundations can always be used where there are no heavy loads - usually in terraced or as a foundation for a small garden shed.
Their advantage lies in the fact that with a point foundation much less material is needed, as for example with a continuous foundation plate. In addition, a point foundation is also much easier to produce.
Different Types of Point Foundations
The easiest way to build a timber foundation point foundation is with concrete walkway tiles that are simply applied in a layer of laying sand on a fixed gravel bed. For most terrace constructions this is usually enough and you save yourself the concrete.
A classic point foundation, on the other hand, is cast from reinforced concrete. Reinforcing baskets made of braided iron are suitable for the reinforcement here. The size of a cast foundation point varies in practice between about 30 x 30 cm and 50 x 50 cm. In order to remove the structural loads evenly, you should always have the same distance from each other and lie as exactly as possible in alignment.
Apply point foundations frost-proof
In order to prevent water from freezing and thereby lifting the foundations, the foundation pits should in any case be dug into the frost-proof area. In our latitudes this is the case at a depth of 80 cm.
Foundation points for fixing posts and studs
The individual foundation points can also be used to fasten poles or posts - for example, when building a carport or a fence. Again, a frost-proof system is particularly important.
Step-by-step instructions for a reinforced concrete point foundation
- Reinforcing baskets
- Mason's cord
- Wooden pegs
- Concrete trough and mixer
- Spirit level
1. Measure and stake the foundation sehr Measure your foundation area very precisely and transfer the dimensions a drawing that you make on graph paper. So you can plan your foundation exactly.
Then use wooden pegs and mason's cord to cut off the foundation area and the individual alignment, and also mark the center of each foundation point with a wooden peg. Aus 2. Excavation of the foundation pits
Now dig a roughly 40 x 40 cm wide pit approximately 80 cm deep into the ground, wherever you have marked a foundation point with the wooden pegs.
Make sure once again that all points are actually on the same alignment line.
3. Pouring concrete
Now you can place the reinforcement cages in the foundation pits and pour in the concrete. If you do not use reinforcement, you have to put the concrete into layers of about 25 cm, which you first compress before you pour in the next layer.
You can either mix the concrete yourself from prefabricated concrete sacks at the hardware store, or have it delivered to the concrete factory. This is usually worthwhile only for larger quantities. To make your own concrete you need a mixing machine and experience. Before further processing, you must allow the foundation to harden sufficiently - depending on the type of concrete, this can take up to ten days.
Tips & TricksThe simpler version, which does not require any drying time, is simply laying concrete paving slabs on a gravel bed. This is usually sufficient for most purposes and smaller loads.