Crack Repair in New Buildings: A Comprehensive Guide
Dealing with cracks in new buildings can be a daunting task, especially when they appear in both joints and plaster. These cracks can be alarming and seem to indicate various underlying issues, such as poor mortar strength, uneven settlement, or even structural weaknesses. Proper identification and repair are crucial to ensure the safety and longevity of your new building.
Identifying the Source of Cracks
Clay Lightweight Concrete (CLC), Autoclaved Aerated Concrete (AAC), and concrete blocks can all experience cracks under certain conditions. For instance, when the mortar strength exceeds the block strength, it can lead to cracked blocks. This issue arises because these materials do not yield as readily as traditional red bricks, making them more susceptible to cracking under stress.
It is essential to determine where the cracks are forming in your walls. If cracks are limited to the joints, it is a sign that the mortar is too weak or not properly filled. Cracks in the blocks themselves are more likely to be caused by issues such as shrinkage, settlement, or minor earthquake tremors.
Repairing Plaster Cracks
When dealing with numerous visible cracks all over the walls, the plastering method is the most effective solution. This method not only covers up the cracks but also adds additional strength to the masonry. It is important to note that any other repair method might result in an unsightly appearance.
If the cracks are narrow, they can be filled with cement mortar for a quick fix. However, if the width of the cracks exceeds 2mm, they may indicate deeper structural issues such as foundation settlement. Widespread or growing cracks require an expert's diagnosis to ensure the integrity of the building.
Foundation Settlement and Structural Cracks
Cracks in walls can sometimes be attributed to uneven settlement of the foundation. This can lead to narrow, hairline cracks, which are common after shrinkage of plaster. However, if the cracks are more pronounced or continue to grow, they may indicate a more serious issue, such as foundation settlement. These conditions require immediate attention and a thorough examination by a structural engineer.
Only structural experts can accurately determine the root causes of the cracks. It is highly recommended to consult a professional before taking any action to repair the cracks. Avoid consulting non-professionals as their advice may not be reliable.
Expert Consultation and Warranty Claims
Cracks can develop due to various reasons, including shrinkage, settlement, or even the impact of temperature changes. It is crucial to consult an expert before making any conclusions. If the cracks are minor and not structural, you can follow the steps outlined below for repair. However, if the cracks are severe or structural, a professional should evaluate the situation.
If the building is already fully finished and you have moved in, it is unlikely that cracks will appear after the construction phase. New buildings typically come with warranties lasting at least one year. Therefore, the best course of action is to request the general contractor to make the repairs at their cost. If the contractor is hesitant, contact the municipal building department manager who conducted the inspections to get an explanation.
Following these steps will help ensure that your new building is safe and properly maintained. Consultation with a professional and adherence to warranty agreements are key to addressing any issues effectively.