Situations in which you want to learn how to strengthen the foundation of the house, fortunately, are quite rare. However, when faced with a similar problem, most building owners do not know what they need to do and whether they will cope with it on their own.
Signs of foundation failure
About the fact that the strip foundation the buildings need to be strengthened; the following external signs may indicate:
Draft of the foundation
If there is a columnar foundation under the building, then in case of its damage the building will behave in the same way:
Effects of weakening
Thinking how to strengthen the foundation of the house, it should, first of all, establish the cause of the apparent destruction of the structure. This can be done only in one simple way - by digging up the damaged part of the foundation.
If the foundation does not go deep into the ground (that is, its lower plane is in line with the rest of the foundation), then you will most likely find damage in its very “body” (cracks, grooves that have become visible frames, etc.). This result becomes possible in one case - the foundation was subjected to long-term exposure to groundwater and was not protected from them.
Digging up the foundation
In addition, there is another reason for the destruction of the foundation “body” - swelling of the soil . This happens as follows: if in your area in winter the ground freezes to a rather great depth, and the foundation was not deep enough, then the water under its sole turns into ice when the temperature drops. As you remember from school lessons, ice has a greater volume than water, which is in its liquid form. Therefore, the ice particles begin to act on the base of the foundation, pushing it up, and on the other hand, the weight of the building presses against the foundation. As a result, it does not withstand such a compressive effect, alternating in spring with soil thawing and the formation of small voids, in which the building, under the influence of its weight, begins to slowly fall.
Effect of soil heaving
If you have questions about the depth of the foundation (it should be at least a little more depth of soil freezing in your area) it is recommended to contact the local architecture - there the experts will look at their maps and inform you of the necessary parameters.
If the foundation fell into the ground under the influence of the weight of the building, then you will see a gap (vertical crack) in the “body” of the strip foundation or one column overly deep (if your building was erected on a columnar foundation).
Deciding how to strengthen the foundation of the house, you first need to determine whether you can handle this problem yourself. If your building has more than one floor or its walls are lined with heavy materials (such as a brick or block), then it is better to immediately contact the firms specializing in these works. Such buildings weigh too much, and in order to strengthen the foundation, in some cases, you will have to raise the building in order to return it to horizontal slabs.
Lifting the house
If the foundation under the wooden building was damaged, then work to save it will consist of several basic processes:
Unloading the foundation
At the same time, the strip foundation can not be changed, but strengthened, The bay next to it is another "foundation" so that under the lower plane of the old foundation there is a "pillow" that makes up a whole with the new "foundation". Both designs (both old and new) must be interconnected by reinforcing rods.
In those cases where the foundation of the house was not sufficiently buried, you should go in two ways at once:
And do not forget to protect the repaired foundation from the effects of groundwater, causing a waterproofing composition on its vertical surfaces.
We recommend reading:
How to replace the foundation by raising the house, see below: