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Have you observed any stains, dark areas, or musty smell near to your windows? Mould around windows is a common problem in Singapore homes, especially when humidity, condensation and poor ventilation allow moisture to remain on surfaces.
Mould can grow on the surrounding walls, rubber seals, and window frames. Occasionally, the apparent growth is really an indication of an underlying moisture issue.
Knowing why mould grow around windows and window frames will help you find the root of the issue, stop the mould from spreading, and know when to need expert assistance.
What Causes Mould to Form Around Windows?
Some conditions, like moisture, are necessary for mould to grow. Windows and surrounding surfaces may become more susceptible to the formation of mould when wet patches form as a result of condensation, excessive humidity, or water leaks.
Here are some of the most common reasons: –
1. Window condensation
- Condensation is the primary cause of window mould.
- If cooler surface interact with warm and moist air indoors, water droplets tend to form on the glass as well as the window frame and adjacent areas.
- The prolonged presence of moisture in such an environment leads to fungal formation. Window condensation tends to be more common in poorly ventilated rooms, like bathrooms and bedrooms.
2. High Indoor Humidity
- It is not easy to maintain humidity levels in indoor areas in Singapore considering the weather here is hot and humid.
- Indoor areas' humidity levels may increase as a result of performing domestic activities such as cooking, showering and hanging up the laundry. This will lead to condensation, which will lead to the development of mould near the windows.
- Fungal growth may also be caused by high moisture levels on the walls, ceiling, wardrobe and furniture.
3. Poor Ventilation
- Air circulation is beneficial in terms of removing excess moisture in a room. Ventilation may lead to moisture being trapped in the room.
- The moisture trapped in a room will stay in the windows and the area around the windows for a long time, making it likely for mould to grow in the window frame area.
- A poorly ventilated or humid room requires airflow and moisture removal.
4. Water Leaks Around Window Frames
- Not all growth around windows is caused by condensation
- Seals, holes, cracks, and other problems happening around the window could cause the water to enter the home. The smallest hole would let the water inside.
- If there are any signs of dark marks in the area around the same window when it rains, it may be worth checking if water comes inside through the window or adjacent wall.
5. Damp Walls Around Windows
Sometimes, the problem does not have anything to do with the window itself. It can be caused by the presence of moisture in the wall in which the window exists. When this wall remains moist for an extended period, mould will grow either beneath or on top of the paint layer. This could manifest itself in the form of bubbled or peeling paint, damp spots, or even a musty odor.
What Does Mould Around a Window Look Like?
Mould around windows can appear in different forms depending on the surface and moisture conditions.
Common signs include:
- Black, green, white, or brown spots
- Dark marks around window corners
- Growth on window seals
- Spots on the frame or sill
- Discolouration around the glass
- Growth on the wall beside the window
- Peeling or bubbling paint
- Damp surfaces
- A persistent musty odour
- Condensation that keeps returning
Growth can also develop in small gaps and difficult-to-see areas around the frame. If you notice a musty smell but cannot identify the source, there may be hidden moisture or fungal growth that requires further inspection.
How to Prevent Mould Around Windows
Here are some ways through which you can prevent mould growth on your windows.
- Dry Your Window: Frames Dry the moisture in your glass, sill, and window frames. Drying up the moisture helps avoid mould growth.
- Improve Airflow: Try not to leave humid air trapped in rooms for long periods. Good air flow will help prevent excessive moisture in your rooms.
- Keep Indoor Humidity Under Control: A humid home is more likely to experience condensation. It is advisable to have suitable humidity levels in your house. Another method to solve this problem is by using a dehumidifier.
- Window Seals: Check the condition of your window seals. It is important to check for any cracks, leakage or other damages. Any leakages in your windows require checking.
- Don't place furniture against damp walls: It is better not to place furniture against damp walls since this might cause lack of airflow. It will also be useful when checking for mould behind your furniture for moisture and ventilation problems
How Do You Remove Mould From Window Frames?
For small areas of surface growth, cleaning may improve the appearance of the affected area
However, this may not address the actual cause. If the cause of the condensation is not addressed, then the mould will continue to recur despite the cleaning. The proper remedy to use will depend on the cause, place and magnitude of the problem.
Where the mould is in large quantities, recurs or seems to come from hidden places, expert assistance may be needed. If you suspect that the problem extends into a wall or ceiling, you can read more about how to remove mould from inside walls and ceilings.
When Should You Get a Professional Mould Inspection?
A professional inspection may be worth considering if:
- Growth keeps returning after cleaning
- You notice a persistent musty odour
- The wall around the window feels damp
- Paint is peeling or bubbling
- There are signs of water intrusion
- The affected area is spreading
- You suspect growth may be hidden inside a wall
- You cannot identify the source of the moisture
- The same area repeatedly develops spots
Mould Inspection can be useful in assessing the visible problem and finding out the circumstances which could be causing the reoccurrence.
This can be especially helpful when the mould reappears despite regular cleaning.
For further details, read our blog on why mould keeps coming back after cleaning and understand why just cleaning the visible area may not work.
How The Mouldmen Can Help
Mould around windows is often a moisture problem before it becomes a cleaning problem. The development of mould near window frames and surrounding walls can be due to condensation, humidity, lack of air crossing, and also even water leakage.
While cleaning up the affected area may result in improvements, it won’t necessarily prevent further problems from occurring until the source of the moisture is addressed. A professional mould inspection can be useful to determine the potential cause of the problem and decide what should be done next if you have recurrent mould, moisture, or mould growing at one particular window time and time again.
For all residential and commercial properties in Singapore, The Mouldmen provides professional mould inspection, removal, and remediation services. In case you are worried about mould near your windows or anywhere else in your property, book your mould inspection today.
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