Repairing Cracks in Masonry Walls
The appearance of cracks in walls has a strong visual impact and are a cause for concern for the tenants of a house. But not all cracks appear for the same reasons and not all have the same danger.
But a crack is one thing and a crack is another. The first should not exceed the millimeter of opening or affect the brick, but only the cement coating, plaster or paint walls, partitions or facades. The cracks, on the other hand, are the fissures that exceed the millimeter of opening. Their appearance can also be more or less dangerous depending on the place where they appear: it is not the same to detect them in structural elements (beams, joists, concrete walls, pillars…) as in non-structural ones (partition walls and cladding).
Dangerous cracks in walls
The cracks in the walls are not only elements that affect the aesthetics of the environment or generate problems at the time of wallpapering or painters in Madrid perform their work. It can also mean that there are structural problems that if not treated put at risk the stability of the building and the lives of those who live in it.
Before starting to repair it is necessary to evaluate the type of crack and if it represents a risk. To do so, contact an expert to do the inspection. If it is a superficial one the solution is simple, but if it is deep it is necessary to resort to experts.
The first step is to enlarge the crack a little using a spatula. You must remove all the plaster that is not firm. Then use a brush to remove the plaster residue and dust from the fracture and proceed to moisten it.
Place on the spatula special putty to cover cracks or aguaplast and apply several thin layers all over the crack and let it dry. Then start sanding the area until it is level with the wall, remove the dust and that’s it.
Repair of cracks in walls sika
Within the masonry works, one of the most common pathologies that we can find, regardless of the material of which the wall has been executed (masonry, ashlar, bricks …), are the fissures and cracks.
We speak of a crack when the opening is fundamentally superficial and does not affect the section of the wall. On the other hand, the crack crosses the entire thickness of the wall. In the first case the problem is aesthetic and durability. In the second case, it can become a structural problem.
Whenever we must undertake the repair of a stone wall, it is necessary to know what the pathologies are and what their origin is. The first step is to analyze the cause of the problem in order to eliminate it, and then the repair itself. If this work is not carried out in this order, the cracks are likely to reappear.
In this case, a series of cracks will appear in the factory, which, if we do not previously underpin the foundation, will continue to increase, and may even lead to the collapse of the building. For this reason, in this case, the first step would be to underpin the footings and/or stabilize the ground if necessary, and then proceed to repair the walls.
Vertical cracks in walls are hazardous
When the parts are so deteriorated that they affect the aesthetics of the whole and their repair is not feasible, they are replaced. This operation has two variants, depending on the typology of the pieces, so we distinguish between replacement of amortized pieces and pieces hung to metallic substructures or directly to the structure.
When the joints are cracked or when there is a loss of mortar, it is necessary to replace it. The new mortar must have the same color, texture and disposition as the old one, in addition to having less or equal compressive strength and similar chemical composition to avoid the appearance of soluble salts.
In case of cracks affecting the facing, it is necessary to reinforce it. This operation is usually carried out by “stitching” or “stapling” the cracks. To do this, first the crack is opened in a “V” shape and some perpendicular lines are made perpendicular to the crack for the placement of staples, reinforcement or wire, sealed with epoxy resins and special filling mortar. Once the area has been repaired, a mesh can be placed on the repaired surface to achieve a homogeneous surface and finally, a continuous coating is applied to restore its original appearance.