Hairline cracks on rendered walls are a common problem that many homeowners in Perth, Australia, may encounter. These cracks, which typically appear as thin, web-like lines running through the paint finish, are often caused by various non-structural related factors. However, while they may not pose a structural threat, they can be unsightly and lead to further damage if left unaddressed.
One of the most common causes of hairline cracks on rendered walls is foundation settling. As the soil beneath the foundation of the home shifts and settles over time, it can cause the walls to move and crack. This is particularly true in Perth, where the soil is prone to movement.
Thermal expansion and contraction are other common causes of hairline cracks on rendered walls. During the hot summers in Perth, the walls of a home can expand, causing the paint to crack. Similarly, the walls can contract during the cooler months, leading to the same issue. This is especially true for rendered walls exposed to direct sunlight for a long time.
Moisture penetration is another major cause of hairline cracks on rendered walls. Rainwater can seep into the walls through cracks and gaps, causing the paint to blister. This is particularly true in Perth, where heavy rains are expected. High humidity levels in the air can also lead to the same problem.
Poor surface preparation before painting is another possible cause of hairline cracks on rendered walls. If the surface was not properly cleaned or if any existing damages were not correctly filled and sealed before the paint was applied, this could also lead to cracking in the paint finish.
It’s also possible that the original paint finish was unsuitable for the surface, not providing enough flexibility to accommodate the natural movement in the house structure.
While hairline cracks on rendered walls are generally not a structural concern, they can lead to further damage if left unaddressed. To maintain and protect your rendered walls, addressing hairline cracks as soon as you notice them is important. One of the best ways to do this is to clean the surface of the crack and then fill it with a flexible masonry filler, such as a silicone-based caulk or a flexible acrylic filler. After the filler has cured, it should be painted to match the surrounding area.
It’s also important to remember that hairline cracks can develop in the future due to natural movement in the house structure, so it’s essential to keep an eye on them and, if needed, to reapply the paint finish to keep the wall looking good. To prevent this, it’s recommended to use paint finishes that are suitable for exterior walls and have a good resistance against weathering.
Another way to maintain and protect your rendered walls is to ensure they are adequately sealed. This can help to prevent moisture penetration and keep your walls looking good for years to come. Additionally, it’s recommended to keep an eye on the condition of your rendered walls and address any issues as soon as they arise. This can help to prevent further damage and ensure that your walls remain in good condition.
In conclusion, hairline cracks on rendered walls are a common problem that many homeowners in Perth, Australia, may encounter. Various non-structural related factors, non-structural-relating, thermal expansion and contraction, and moisture penetration, often cause these cracks. While they may not pose a structural threat, they can be unsightly and lead to further damage if left unaddressed. To maintain and protect your rendered walls, it is essential to address hairline cracks as soon as you notice them, keep an eye on the condition of the walls, and use paint finishes that are suitable for exterior walls and have a good resistance against weathering. Additionally, ensuring that the walls are properly sealed can help to prevent moisture penetration and keep your walls looking good for years to come.
Another essential factor to consider is the quality of the original render finish. If the render finish is not applied correctly or the wrong type of render is used, it can lead to hairline cracks and other issues. It’s essential to make sure that the render finish is applied by a professional and that the correct type of render is used for the specific kind of wall.
It is also important to note that if the hairline cracks are accompanied by other signs of damage, such as bulging or cracking in the masonry, or if the shots are more comprehensive than 3mm, it is best to consult a professional builder or structural engineer. They will be able to assess the condition of the wall and recommend the appropriate course of action.
In summary, hairline cracks on rendered walls can be unsightly, but they are generally not a structural concern. To maintain and protect your rendered walls, it is essential to address any hairline cracks as soon as you notice them, use paint finishes that are suitable for exterior walls and that have a good resistance against weathering, ensure that the walls are properly sealed and keep an eye on the condition of the walls. Additionally, if other signs of damage accompany the hairline cracks or are more comprehensive than 3mm. Consult with your Building inspector, Inspector West for a full evaluation.
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