How and what to seal a crack in the corner of a wall

Cracks in the corners of the house are a serious symptom of problems. The reasons may be different, but all of them require immediate measures. Why do we talk about it so categorically?

Corners are nodal points that provide spatial rigidity of the entire structure.

Let’s consider them and classify them. Let’s take the four most common reasons.

Causes of cracks in the corner of the wall

Uneven settlement of the base soils. We have considered the phenomenon itself many times in our articles. Simplifying and abbreviating, we can say that due to the subsidence of the soil under the foundation, at different points to different values, stresses arise in the structures of the foundation and load-bearing walls. The result is stretching forces that “tear” the masonry.

External influences. In wartime conditions, cracks in the walls can form as a result of shelling. To cause damage to a building, it is not necessary to hit it. A jolt caused by a shock wave from a side impact can cause movement in weakened soil. The shock wave itself can have a dynamic effect on the wall. If there were hidden problems before that, the situation will worsen.

Vibrations caused by technogenic factors. The most common cause of vibration loads is the proximity to the railway and subway. Also, the cause may be large-scale construction in the neighborhood and even a busy highway. We explained the principle of the phenomenon in detail in our material “Vibration protection based on construction”. The point is that vibrations not only cause movement in the weakened soil, but also are transmitted through the soil.

Constructive calculations. They can appear over time during operation, due to excess loads on the load-bearing wall (uneven load on the walls), thermal expansion, hidden violations of the integrity of the structures (water leakage, formation of condensate and its freezing in the cavities).

Elimination of cracks in the corners of the walls using steel anchors

It is possible to effectively eliminate the problem with the help of steel anchoring technology, based on engineering experience and Stati-CAL methods. For a better understanding of the seriousness of the problem, we also recommend reading “Types and severity of cracks. Express classification.” Where we previously explained what these or other symptoms signal.

Why exactly the Stati-CAL technology?

Old methods of repairing cracks in the walls of the house, such as “grandfather’s” steel brackets (channels) or concrete “shirts”, have many disadvantages. They are heavy, may require maintenance, require more time to install, and often only temporarily mask the problem, creating new stress points.

The solution offered by Stati-CAL is based on the principle of minimal invasiveness. Instead of massive structures, thin but extremely strong spiral anchors made of stainless steel are used. The alloy selected by the manufacturer provides the necessary combination of stiffness and strength. The special shape and method of installation make the anchor “pre-stressed”, which allows it to transfer loads better than classical anchors. In combination with the use of chemical anchors and a special solution for anchoring places, a long service life of the system is ensured.

The technology of eliminating a crack in the corner with steel anchors

The process of restoring a wall corner using spiral reinforcement systems includes several key stages:

1. Diagnosis of problems

Before “stitching” a crack, it is necessary to make sure that the cause of its appearance has been eliminated or stabilized. If the foundation continues to sag, no anchor will hold the wall forever. First, it may be necessary to strengthen the foundation with piles.

2. Preparation of strobes

Depending on the nature of the crack, Stati-Bar spiral rods, Stati-Tie spiral anchors or their combination can be used.

When only spiral rods in the horizontal seams of the masonry, crossing the crack in the corner, are enough, narrow grooves are cut. It is important that the anchor goes around the corner, connecting two perpendicular walls into a single monolith.

What is illustrated in our diagram below:

If it is necessary to fasten side-by-side walls, then specialists choose optimal places for drilling the places where Stati-Tie anchors will be installed. As it is illustrated in the second diagram below:

In more complex situations, the engineer may decide on the need to use both tie rods and anchors.

3. Installation of spiral anchors and rods

A spiral armature is placed and fixed in the cleaned strobes. Chemical anchors can also be used for fastening. The armature works like a powerful spring: it allows the wall to “breathe” during temperature changes, but firmly fixes it when there is a demand for further rupture. After this, the gate with the fittings is laid with a special non-shrinking solution. This prevents corrosion of materials.

Crack injection

The cavity of the cracks itself is filled with a specialized composition, which in the future excludes moisture from entering the wall.

Advantages of the method

• Load distribution. Anchors distribute tensile forces over a large area of ​​masonry, preventing the appearance of new cracks next to old ones.
• Durability The use of stainless steel guarantees that the reinforcement system will not rot inside the wall after 10 years.
• Preservation of aesthetics. This is critically important for historic buildings and private cottages with expensive facade decoration.
• Speed Works are carried out without evicting tenants and using heavy machinery.

Conclusion

A crack in the corner of the wall is not a sentence for the house if you approach the problem from a scientific point of view. The use of steel spiral anchors allows not just to “seal” the crack, but to restore the structural integrity of the building. Remember that effective repair always begins with a professional technical inspection: only by understanding the cause of the building’s illness, you can choose the right “medicine”.