Why Your Building Cracks After Construction — And When to Worry


You have just completed your brand new house. The paint is fresh, the tiles are gleaming — and then, a few months later, you notice cracks appearing on your walls or ceiling. Panic sets in. Is the building unsafe? Did the contractor do something wrong? Is it going to fall down?

The truth is, most building cracks are completely normal and pose no structural risk. But some cracks are serious warning signs that demand immediate attention. At Jadan Construction Group, we want to help you understand the difference.

Why Do Buildings Crack?

Cracks in buildings occur due to a variety of causes — most of them natural and expected, some due to construction defects, and a few due to structural problems. Understanding the cause is the first step to assessing the risk.

Non-Structural Cracks: Common and Not a Cause for Alarm

1. Shrinkage Cracks in Plaster

Fresh cement plaster naturally shrinks slightly as it dries and gains strength. This shrinkage causes thin, hairline cracks — often in a map-like pattern — particularly in large, uninterrupted wall areas. These cracks are typically less than 0.2 mm wide, do not penetrate the full thickness of the wall, and appear within the first 1–3 months after plastering.

These are completely normal and require no structural intervention. They can be filled with flexible filler and repainted.

2. Thermal Movement Cracks

All building materials expand in heat and contract in cold. When this expansion and contraction is restrained — for example, at junctions between concrete columns and brick infill walls — small cracks appear along the interface. These are called thermal movement cracks and are normal, particularly on south and west-facing walls that experience the greatest temperature variation.

These cracks can be managed with flexible sealant applied at the column-wall interface before final painting.

3. Drying Shrinkage of Concrete

Concrete slabs and beams undergo drying shrinkage as excess water evaporates from the mix. This can cause fine cracks in screed floors or concrete ceilings. These are cosmetic and non-structural.

Structural Cracks: Warning Signs You Must Take Seriously

1. Diagonal Cracks from Window and Door Corners

Cracks running diagonally from the corners of windows or doors at approximately 45 degrees can indicate settlement of the foundation below that part of the building, or structural overstressing of the wall above the opening. If these cracks are wider than 2–3 mm and growing over time, seek structural assessment immediately.

2. Cracks Running Through Columns or Beams

Any crack that appears on a structural column or beam — as opposed to on a non-structural infill wall — is potentially serious. Cracks running horizontally through beams or vertically through columns, particularly if accompanied by concrete spalling (chunks breaking off) or visible steel reinforcement, require urgent structural engineering assessment.

3. Cracks Accompanied by Tilting or Movement

If you notice that doors or windows are sticking, floors are no longer level, or walls appear to be tilting or bowing, these are signs of ongoing structural movement. This is a serious situation requiring immediate professional assessment.

4. Cracks After an Earthquake

Nepal experiences frequent minor tremors in addition to major earthquakes. After any felt earthquake, inspect your building for new cracks — particularly on structural columns, at beam-column junctions, and at the base of walls at floor level. These inspection points are most likely to show earthquake damage first.

What Should You Do If You Are Concerned?

The first step is to photograph and measure the crack, noting its width, length, pattern, and direction. Monitor it over 2–4 weeks to see if it is growing. A static crack that does not grow is far less concerning than an active crack that widens over time.

For any crack that concerns you — particularly those in structural elements, those growing over time, or those accompanied by deformation of the building — commission an assessment from a qualified structural engineer. Do not simply paint over cracks and ignore them.

📞 Concerned about cracks in your building? JadanConstruction Group offers structural assessment services. Contact us.

 

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