DIY repair of the foundation of a wooden house

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The installation of the formwork begins with the installation of its inner wall and the laying of the reinforcement frame. Then the outer contour is constructed and the resulting space is filled with concrete mortar.
For the new foundation, formwork is made with a reinforcement frame inside and filled with concrete

After the concrete has hardened, the formwork is physician data and the house is carefully lowered onto the new foundation.
Video: Repairing a Brick Foundation
A wooden foundation is mainly made of pine or larch. A wooden structure always requires complete replacement, as over time it becomes completely covered with fungus and rots. Replacing old elements of such a foundation with new ones is carried out as follows:

Using jacks, the house is raised above the old foundation to such a height that it is convenient to carry out work on dismantling the old pillars and installing new ones. It is important not to overdo it, otherwise the lower crown of the house may crack or sag.
The corner of the house is lifted with a jack so that the old post can be removed

Rotten posts are removed, and leaning but still high-quality supports are placed straight.
In places where new pillars need to be installed, the soil is removed. The bottom of each foundation under the support is covered with sand in a 10 cm layer. A concrete "heel" is created on the compacted sand "cushion". It is a 20 cm thick layer of cement mortar. A new wooden pillar wrapped in waterproofing sheet is placed in the concrete before it hardens.
Wooden poles must be covered with a layer of waterproofing before installation.

The installed pillars are covered with earth and large-fraction crushed stone. After leveling, roofing felt is placed on the supports and wooden beams are installed. The structure is lowered onto them.
The damaged foundation of a dilapidated wooden house can be put in order. To do this, you need to acquire the necessary knowledge and choose a repair or replacement technology. You can also reconstruct the foundation of the house yourself, if you have the desire and at least a little experience in construction work.