Mould and dampness are common problems in many homes, particularly in areas with high humidity or poor ventilation. When mould grows on plaster walls, it not only affects the appearance but also causes a musty smell that can linger throughout your home. If you’ve been wondering whether painting plaster walls can stop the mould smell, the answer is not so simple. In this article, we will explore the relationship between mould, plaster walls, and the role of painting in addressing the smell and preventing future mould growth.
Understanding Mould and Its Causes
Mould is a type of fungus that thrives in damp and humid environments. It grows on organic materials like plaster, wood, and even fabric, using moisture as its primary source of nourishment. Mould can develop due to a variety of factors, including water leaks, poor ventilation, or even excessive humidity in the air.
When mould grows on plaster walls, it can penetrate deep into the surface, producing a strong, musty odour. The smell is caused by the chemicals released by the mould as it breaks down organic matter. These chemicals are volatile organic compounds (VOCs), which can irritate the respiratory system and contribute to an unhealthy living environment.
Can Painting Plaster Walls Stop the Mould Smell?
Painting plaster walls can improve the appearance of your walls and even help seal in some odours, but it will not eliminate the mould or the smell entirely if the underlying issue is not addressed. Here’s why:
- Surface-Level Solution
When you apply paint to plaster walls that have mould, the paint may cover up the unsightly stains, making your walls look cleaner. However, it doesn’t address the root cause of the mould. If the walls continue to be exposed to moisture, the mould will continue to grow underneath the paint, potentially leading to a recurrence of the musty smell. - Temporary Masking
Some paints, especially those designed for damp environments, may contain chemicals that help reduce the smell of mould temporarily. However, this is only a masking effect. While the paint might neutralize some of the smell for a short time, it doesn’t eliminate the source of the problem. If the mould issue persists, the smell will eventually return. - Not a Preventative Measure
Simply painting over mould-infested plaster walls does not prevent future mould growth. Mould thrives in damp conditions, so unless the moisture problem is addressed, the mould will likely return even after a fresh coat of paint.
Steps to Properly Treat Mould on Plaster Walls
To stop the mould smell and prevent it from returning, it’s essential to treat the mould problem properly. Here’s a step-by-step guide to removing mould from plaster walls:
- Identify and Fix the Source of Moisture
Before you do anything else, it’s crucial to identify the cause of the moisture that is encouraging the mould to grow. This could be anything from a leaking pipe to poor ventilation. If the moisture is not addressed, the mould will continue to grow regardless of how often you paint the walls. - Clean the Mould
Once the moisture issue is fixed, the next step is to clean the mould. You can use a solution of white vinegar and water, hydrogen peroxide, or a store-bought mould cleaner. Be sure to wear protective gear, such as gloves, a mask, and goggles, when cleaning mould, as exposure to it can cause health issues. Scrub the affected areas thoroughly to remove any visible mould. - Dry the Walls Completely
After cleaning the mould, allow the walls to dry completely. Mould thrives in moisture, so it’s crucial to ensure that the plaster walls are dry before applying any paint. This may require using fans or dehumidifiers to speed up the drying process. - Apply Mould-Resistant Primer
After the walls are dry, it’s a good idea to apply a mould-resistant primer. This type of primer helps seal the walls and prevents future mould growth. Be sure to choose a product designed for use on plaster, as not all primers are suitable for this surface. A mould-resistant primer will create a barrier that protects the plaster from moisture, reducing the likelihood of mould returning. - Use Mould-Resistant Paint
After applying the primer, you can then apply a coat of mould-resistant paint. Mould-resistant paints contain antimicrobial agents that help prevent mould from growing on the surface. While they may not be able to stop existing mould, they can prevent new growth, especially when used alongside a mould-resistant primer.
Additional Tips to Prevent Mould Smell in the Future
- Improve Ventilation
Ensure that your home is well-ventilated to reduce moisture build-up. This can be done by using exhaust fans in bathrooms and kitchens, opening windows, or installing a ventilation system in areas prone to humidity. - Use Dehumidifiers
In damp areas, such as basements or bathrooms, a dehumidifier can help reduce moisture in the air and prevent mould growth. - Fix Leaks Promptly
Always repair leaks in pipes, roofs, or windows promptly to prevent water from seeping into your walls. This will help reduce the conditions that favour mould growth. - Regular Inspections
Regularly inspect your walls, ceilings, and other surfaces for signs of mould or moisture. Catching mould early can prevent a small problem from becoming a major issue.
Conclusion
In summary, while painting plaster walls can temporarily mask the mould smell, it is not a long-term solution. To eliminate the smell and prevent future mould growth, it’s essential to identify and fix the underlying moisture issue, clean the affected areas, and apply appropriate mould-resistant treatments. Once these steps are followed, painting with mould-resistant products can help keep your walls safe and odour-free.