How to remove mould from render?

Written by Sam on April 18, 2023. Posted in Blog

Mould is a common problem in many homes and buildings, particularly on exterior surfaces such as render. Mould can not only affect the appearance of a building, but it can also cause health issues for those living or working inside. It is important to take steps to remove mould from render as soon as it is discovered to prevent further growth and potential damage to the building. Here are some effective ways to remove mould from render.

1. Safety first Before attempting to remove mould from render, it is essential to take the necessary safety precautions. Mould can cause health issues, so it is important to wear protective clothing such as gloves, a mask, and eye protection. Additionally, ensure the work area is well-ventilated to minimise the risk of inhaling mould spores.


2. Use a biocide A biocide is a chemical agent that can kill or control the growth of microorganisms such as mould. Biocides are available in many forms, including sprays, gels, and liquids. When using a biocide, it is important to follow the manufacturer’s instructions carefully, as incorrect use can be harmful to both humans and the environment.


3. Pressure washing Pressure washing is an effective way to remove mould from render. A pressure washer uses high-pressure water to blast away dirt, grime, and mould from the surface. However, it is important to be cautious when using a pressure washer, as excessive pressure can cause damage to the render surface. It is recommended to use a low-pressure setting or hire a professional exterior cleaning service to carry out the pressure washing.


4. Chemical cleaning Chemical cleaning is another effective method to remove mould from render. Chemical cleaning involves the use of specialized cleaning solutions that can break down the mould and other organic material on the surface. The cleaning solution is applied to the render and left to sit for a period of time, depending on the severity of the mould. Once the solution has had time to work, the surface is rinsed with water to remove the cleaning solution and any remaining mould.


5. DIY solutions There are also some DIY solutions that can be effective in removing mould from render. A mixture of vinegar and water is one of the most popular DIY solutions. The vinegar’s acidic properties can break down the mould and remove it from the surface. Simply mix equal parts vinegar and water and apply the solution to the mould. Leave the solution to sit for several hours before rinsing it away with water. Other effective DIY solutions include a mixture of baking soda and water, or a mixture of bleach and water.

It is important to note that prevention is key when it comes to mould on render. Regular maintenance and cleaning can help prevent mould growth from occurring in the first place. Additionally, ensuring that the building has proper ventilation and moisture control can help prevent mould from taking hold.

In conclusion, removing mould from render is an essential step in maintaining the appearance and health of a building. Biocides, pressure washing, chemical cleaning, and DIY solutions are all effective methods to remove mould from render. It is important to take the necessary safety precautions when attempting to remove mould and to choose the most appropriate method for the severity of the mould and the type of render. Prevention is also essential in ensuring that mould growth does not reoccur.