The 20 Most Critical Structural Defects in Buildings: Guide to Investors

1. The Hidden Reality of the Buildings

After more than 30 years and 2,000+ real estate expertise, I can say with rotundity: every building has flaws. The difference between good and bad investment is to know which are serious, which are cosmetic and which can become structural catastrophes if not addressed in time.

In this guide, we classify the 20 most critical structural defects that we find in residential, commercial and industrial buildings, organized by building area and gravity level.

2. Defects in Cimentation (The Most Serious and Costful)

The foundation is the soul of the building. A defect here compromises global stability and may require interventions of millions of euros.

1. Variance

They occur when different areas of the building sink at different rates, usually by heterogeneity of the terrain or by uneven loads. They manifest themselves with cracks diagonals in facade (square type), doors that do not close, and slides in forged. Cost of repair: €50,000 – €500,000+ per gravity.

2. Socavation of the foundation

Loss of ground erosion support, leakage of water in buried nets, or impoverished near excavations. It is especially critical in historical buildings and in areas with a high water level. Repair cost: 100,000€ – 1M€+.

3. Corrosion of Armors in Prison

In reinforced concrete foundations, the corrosion of the armor (by carbonation of the concrete or presence of chlorides) reduces the resistant section and can cause collapse. Detectable with georade and pacometry. Repair cost: 80.000€ – 400.000€.

4. Falls in Pilots or Micropilotes

In deep foundations, the pilots can present breakages, displacements or lack of support in resistant stratum. Requires integrity tests (PIT) and sonic logging. Cost of repair: 150.000€ – 1.5M€+.

5. Land liquefaction

In seismic zones with saturated soils, an earthquake can lead to soil liquefaction, completely losing its bearing capacity. It requires advanced geotechnical studies and, in many cases, improvement of the terrain. Prevention cost: 200.000€ – 2M€.

3. Vertical Structure Defects (Pillars and Walls)

6. Corrosion of Armors in Pillars

The pillar is the most critical element of the structure. The corrosion of your armor reduces your bearing capacity and can cause the progressive collapse of the building. The most exposed areas are the bass of pillars in contact with the ground and the pillars of basements with humidity. Cost of repair: 5,000€ – 30,000€ per pillar.

7. Fissures by Flexion in Vigas

The beams under unforeseen overloads or in the absence of reinforcement can present vertical fissures in the center of the vain (maximum zone flector). If the fissure exceeds 0.3mm in width, it requires immediate structural reinforcement. Cost of repair: 3,000€ – 20.000€ per beam.

8. Fissures by Cortante in Vigas and Pillars

More dangerous than the bending, the cutter fissures are diagonal (45°) and appear near the supports. They indicate cut-off, which is fragile and sudden. They require reinforcement with carbon fiber or lace. Cost of repair: 5.000€ – 40.000€ per element.

9. Slender Pillar Pandeo

In very slender pillars (height/diameter  12), the axial load can cause pande, with progressive lateral deformation. It is a design or execution defect that compromises global stability. Cost of repair: 10,000€ – 80,000€ per pillar.

10. Pathologies in Factory Loading Walls

In ancient buildings, brick or masonry loading walls may present deplomes, fissures due to lack of rigidizers, or loss of section due to inadequate interventions (opening of holes without reinforcement). Cost of repair: 15.000€ – 100,000€ per wall.

4. Horizontal Structure Defects (Forged)

11. Excessive Arrows in Forged

The vertical deformation of a forged under load. If it exceeds L/300 (Spanish regulation), it generates a sense of insecurity and can affect partitioning and carpentry. Causes: overloads, lack of chanting, flow of concrete. Repair cost: 10,000€ – 60,000€ per forged.

12. Fissures in Unidirectional Forged

Forged of beams and bolts can present ridges parallel to the beams (for lack of stiffness) or perpendicular (for overload). The fissures in the vigueta-bovedilla encounter are particularly worrying. Cost of repair: 5,000€ – 25,000€ per forged.

13. Pathologies in Reticular Forged

The reticular forged (flats with stalls) are very sensitive to puncture in the encounter with pillars. The lack of capital or puncture gun can cause sudden collapse. Cost of repair: 20.000€ – 150.000€.

14. Corrosion of Armors in Covers

Covers are particularly vulnerable to corrosion from water leaks. The combination of humidity and oxygen accelerates the oxidation of the armor, with the consequent detachment of the concrete coating. Cost of repair: 8.000€ – 40.000€.

15. Excessive vibrations in Forged

Although they do not compromise security, excessive vibrations (for lack of mass or stiffness) cause discomfort to the occupants and may damage nonstructural elements. Solution: reinforcement with collaborating concrete slabs or tanned beams. Cost of repair: 15.000€ – 80.000€.

5. Defects in Covers and Facades

16. Anchoring in Ventilated Falls

The ventilated facades, very common in buildings of the years 2000, present pathologies for corrosion of metallic anchors or for their fatigue. The detachment of coating parts is a serious risk for public safety. Cost of repair: 30,000€ – 200.000€.

17. Board Breaking in Cortina Walls

The curtain walls (curtain walls) depend on the sealing of seals for their pondering. The degradation of sealing (sylls, foams) causes leaks that damage the structure and interior finishes. Cost of repair: 20.000€ – 150.000€.

18. Delamination in SATE/ETICS

External thermal insulation systems (SATE) may suffer from insulation delamination from support, usually due to poor performance or untreated previous humidity. Cost of repair: 25,000€ – 120.000€.

19. Pathologies in gardening

The landscaped roofs (green roofs) present specific pathologies: perforation filters of waterproofing by roots, collapse of the plant layer due to lack of drainage, or overload for water accumulation. Cost of repair: €40,000 – €250,000.

20. Fissures by Retraction in Elements

In thick concrete elements (basin walls, large section pillars), friction can generate deep fissures that compromise the pond and durability. Cost of repair: 5,000€ – 30,000€.

6. How to Quantify Impact in the Asset Value

A structural defect not only has a direct repair cost. Its real impact on the asset value includes:

• Direct repair cost: Materiales, mano de obra, medios auxiliares.
• Coste indirecto: Pérdida de alquileres durante la reparación, realojo de ocupantes.
• Depreciación del activo: Un edificio con patologías estructurales conocidas se deprecia entre 15-40%.
• Coste financiero: Dificultad para obtener financiación o refinanciación.
• Coste legal: Litigios con constructores, proyectistas o aseguradoras.

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