Understand the main pathologies of constructions and learn to differentiate cracks, fissures, and fractures, their causes, and when they require technical attention.
Submitted at Jan 29, 2026, 2:00 PM
Exemplo de rachadura. (Umberto/Unsplash/Divulgação)
Buildings, like any physical structure, are subject to movements, natural wear, and external interference over time. Among the pathological manifestations most commonly found in walls, slabs, columns, and coverings are linear openings that, popularly, have various names — cracks, fissures, and fractures.
Exemplo de fissura. (Jelena Lapina/Unsplash/Divulgação)
Although many people use these terms interchangeably, in architecture and civil engineering they belong to the group of construction pathologies and have different technical classifications, related to the thickness of the opening, the causes of the problem, and the level of risk they represent.
rachadura; casa (Lallaoke/Unsplash/Divulgação)
Being able to correctly identify each of these manifestations is essential to understand whether the problem is merely aesthetic or if it may indicate structural compromise. Moreover, this distinction helps to define the type of intervention necessary, avoiding superficial solutions that merely mask symptoms without addressing the origin of the pathology.
Fissures are very thin openings, usually with a thickness of less than 0.5 mm, almost like a "hair strand" on the surface of the paint, the plaster, or the coating. They usually arise from natural movements of the materials, such as thermal expansion and contraction caused by temperature variations, humidity, improper curing of the plaster, or small surface tensions. In many cases, fissures appear shortly after construction or in the early years of the building, especially when there are flaws in the execution of the finishing.
Exemplos de fissuras. (Freepik/Divulgação)
Because they are superficial, fissures rarely indicate structural risk. They primarily affect the aesthetics of the projects and, if left untreated, may facilitate water infiltration over time.
A crack is an evolution of the fissure. It features a larger opening, typically between 0.5 mm and 1 mm, and is easily visible to the naked eye. Unlike fissures, cracks can penetrate the coating and reach deeper layers, such as the plaster and masonry. They are often associated with slight structural movements, soil settlements, vibrations, overloads, or the absence of adequate expansion joints.
Exemplo de trinca. (ZAP Imóveis/Divulgação)
Although they do not often represent an immediate risk to the safety of the building, cracks require more attention. Their presence may indicate that the structure is undergoing stresses for which it was not fully prepared or that the soil is settling unevenly.
Fractures are wider openings, generally greater than 1 mm, deep, and often traverse the entire thickness of the wall. In some cases, it is possible to see the other side of the masonry or detect displacements between parts of the structure. This type of manifestation is often related to more serious issues, such as structural failures, significant soil settlement, persistent infiltrations, corrosion of reinforcements, overload, or design and execution errors.
Exemplo de rachaduras. (TM3 Incorporadora/Divulgação)
Unlike fissures and cracks, a fracture should not be treated merely as an aesthetic issue. It may indicate a compromise to the stability of the building and requires technical assessment by an engineer or architect.
Aplicação de massa corrida (freepic.diller/freepik/Divulgação)
The correction is usually simple and related to the surface finishing. It typically involves scraping the affected area, applying suitable joint compound, and repainting. Nevertheless, it is important to observe the pattern and recurrence of these marks: fissures that reappear at the same point may indicate more significant movements of the structure or problems at the base of the coating.
Treating the crack requires a more careful analysis of the problem's origin. Since it can penetrate deeper layers than the coating, merely covering the opening tends to result in the reappearance of the pathology in a short time. In these cases, it may be necessary to reinforce the affected area and correct the cause of the movement before the aesthetic repair.
The repair of a fracture may involve structural interventions, localized reinforcements, soil treatment, or even the reconstruction of sections of the wall. Because it is often associated with more serious problems, ignoring this type of opening can significantly worsen the situation over time and compromise the safety of the building.
Observation is the main ally in identifying these pathologies. Evaluating the thickness of the opening, its depth, the direction (horizontal, vertical, or diagonal), the presence of moisture, and whether the mark is increasing over time are fundamental clues to understanding the severity of the situation. Fine and stable fissures tend to be merely superficial, while diagonal, wide, and progressive openings usually indicate more serious structural movements.
trincas-fissuras-rachaduras (dallminas/Divulgação)
Whenever there is doubt about the origin of the problem, growth of the opening, signs of infiltration, or displacement of parts of the wall, it is advisable to seek a qualified professional. A technical assessment can identify the real cause of the manifestation and indicate the correct solution, preventing rework and ensuring the safety of the building. After all, understanding the difference between fissures, cracks, and fractures is more than just a matter of terminology — it is a way to preserve the integrity and durability of constructions.
CASACOR Publisher is a creator of exclusive content, developed by the CASACOR Technology team from the knowledge base of casacor.com.br. This text was edited by Yeska Coelho.
