Cracks in the walls: the solution

Why do cracks and fissures form in walls?

More and more frequently, inside apartments and on the external walls of buildings, die crepes.

This symptom should never be taken lightly or neglected, as in most cases the formation of the crack in the wall can be an effect related to the land subsidence or of the foundations themselves, and if widespread they can cause serious damage, and in more serious cases even seriously undermine the stability of a house or an entire building.

External die cracks

Il subsidence of foundations and the underlying ground, causes dangerous cracks in walls.
To restore the original stability of the building, eliminating the collapse and guaranteeing safety now and in the future, both for the occupants and for the neighbouring buildings, a Consolidation that stops this phenomenon.

To prevent damage and cracks in homes from occurring in the first place, it is necessary to first respect the following building regulations in force in the territory and it is also necessary to carry out a constant maintenance of the same and of the sub-services that affect the territory, such as the sewerage networks.

Solving the problem of cracks on the wall caused by subsidence

When these subsidence phenomena occur, it is possible to intervene by consolidating the foundations. Consolidations of the node can be carried out ground-foundation using injections of expanding resinsor you can use some steel micropiles preloaded, whose function is to transfer the loads of the entire building deeper into the ground where more stable and consistent soils are located.
The company SyStab realizes both types of intervention with the utmost seriousness and professionalism, advising the customer, after having carried out studies on the nature of the land performed with suitable investigations geological and geotechnical, the most appropriate type of intervention in relation to the foundational failure or subsidence present in the structure.

Cracks in the wall and differential settlements how to solve the problem – Systab

Sometimes it can happen that the differential settlements present are caused by other causes, such as water infiltrations into the subsoil, due to the proximity of an aquifer or because of the presence of a damaged water pipe; in this case, it is necessary to first eliminate the cause of the infiltration and then proceed with the consolidation.

Repair of cracks in external and internal walls with consolidation with resin injections

The system of SyStabbased on the injection of slow expansion resins a differentiated density It is one of the least invasive technologies on the market in terms of structural consolidation.

This type of consolidation intervention is quick to execute, in fact, it allows the consolidation of the ground-foundation node by carrying out perforations of only 25 mm in diametermade at the base of the masonry to be consolidated, using manual equipment that can also be easily used indoors, in basements and cellars, without having to resort to excavations or demolitions of any kind.

Structural failure: resin injections to consolidate – Systab

Inside these holes, the resins will then be injected, whose function will be to:

• fill in the gaps e compact the soilwhich will have lost consistency because it has disintegrated or been softened by the water;
• completely reactivate thebottom imprint of the building;
• improve the geo-mechanical characteristics of clayey soil, reducing the shrinkage and swelling phenomena typical of these materials.

During the operations the structure will be monitoredusing laser levels and carrying out some adjustments during the work prove penetrometriche pre and post injection, necessary to verify the results of the intervention.

For the injections SYSTAB technology uses two types of resins, alternating them based on the parameters detected during the injection phases:

• a first high density resin suitable for the initial injection phases, as it is able to saturate the largest cavities while maintaining high mechanical resistance values ​​and avoiding uncontrolled material leaks;
• a second high expansion resincapable of exercising strong isotropic thrusts and achieve maximum compaction levels even in soils with little or no permeability.

Structural Failure: Resin Injection Pipe – Systab

The alternating injection of the two formulations allows to obtain in the foundation soil:

• cavity filling with a decrease in the void ratio;
• soil compaction with an increase in geomechanical characteristics;
• hiring and load distribution;
• water isolation and waterproofing.

To ensure the effectiveness of the intervention and to have maximum diffusion, the resin must be as homogeneous as possible and the initiation point must be located below the foundation imprint affected by the subsidence.

About the number of injections and at the distance between the holes, a specific space must be provided Consolidation projectwhich will obviously vary from case to case, as will the time needed to complete the work to perfection.

The resins employed are eco-friendlyare injected under constant laser control and do not alter the hydrogeological regime of the subsoil, guaranteeing the total absence of contraindications.

For more information on how to eliminate cracks using pre-loaded posts, read all Advantages of the SYStab System

Wall Cracks: How to Consolidate a Building with SYSTAB Preloaded Steel Micropiles

When the nature of the land it is more friable the bottom soils are extremely compressible and in most cases they are of organic origin such as peat and organic clay. In areas of this type, if the foundations are not adequate, subsidence occurs which produces lesions and cracks cracks in the internal walls which may also pass through the external face of the building’s masonry.

In these cases, the first things to do to understand if the cracks are structural or are simply settlement cracks of the building are:

• essays in foundationwhich check the condition of the heads of the existing foundation piles, generally made of wood, and the cracking condition of the reinforced concrete foundations above;
• and’geological survey con prove penetrometriche statics that provide more detailed information on the nature of the soil and its stratigraphy up to great depths;
• detect if there are aquifers or similar nearby.

Cracks on external walls how to intervene – Systab

Next, you need to prepare a project which consolidates the foundation soil; the solution proposed by Systab provides for some Steel micropiles pressed contrasted with the structure by the use of hydraulic jacks.

Micropiles are available in variable diameters and 76 a 114 mm con 8mm thickness in the standard version. Depending on the severity of the collapse that needs to be consolidated, the number of micropiles to be inflicted, their length and also the driving pressure which will then have to be verified during the installation phase for each individual pole, pushing each element to the depth suitable for developing the design load capacity.

Systab Steel Micropile Driving

After driving, the poles will be preloaded with a load higher than the operating load, so as to induce primary settlement in the new foundation soil, thus avoiding unwanted future settlements.

The new micropiles will finally be driven in in solidarity with each other using steel plates.

The system of pali precaricati SYSTAB boasts numerous features:

• a high one speed of execution;
• l’absence of vibrations and harmful stresses during the installation phase;
• the non-use of mud and cement mortars;
• non-extraction of land;
• the pole check by measuring the installation pressure;
• il preload with loads higher than the operating ones, avoiding the risk of settling.

For further information, read all the Advantages of the SYStab System

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THE EDITORIAL TEAM RECOMMENDS

Crack pattern and cracks in walls solutions on how to intervene

The formation of a crack in the wall it is a clear sign of a structural failure that may concern either the ground or the foundation, to resolve the problem by intervening promptly you can contact Systab Srl a company that deals exclusively with Consolidation of foundationsbased in Parma.

Born from the skills of its technicians, with over 15 years of experience in the sector, Systab is a company capable of proposing cutting-edge consolidation systems for the recovery of damaged buildings, the Foundation stabilization and the seismic improvement.

The company offers its customers a network of highly qualified technicians, engineers and geologists, which covers the entire national territory and allows it to provide a assessment and diagnosis service completely free!
Once contacted, the technicians will verify the nature and the dangerousness of the damage, recommending the most suitable solution only if and where it is necessary, being able to count on differentiated solutions and products.

All SYSTAB interventions are designed with extreme care and guaranteed from the experience of its managers, committed to consolidation since 2000.