How to Treat Mould on Exterior Walls Before Painting: Essential Steps to Prepare Your Walls for a Fresh Coat

Mould on exterior walls can be a nuisance, especially when you're preparing to paint. Treating this issue is crucial to ensure your paint adheres properly and lasts longer. First, identify the source of moisture, as this is often the root cause of mould growth. Once you’ve addressed that, you can start the cleaning process. Use a mixture of water and bleach or a commercial mould removal solution to scrub the affected areas. Remember to wear protective gear like gloves and masks to keep safe from spores. After cleaning, allow the surface to dry completely before applying any primer or paint.

Steps to Clean Mould from Exterior Walls

1. Assess the Area: Check for any visible mould spots and determine the extent of the problem.2. Prepare Your Cleaning Solution: Mix chlorine bleach with water (1 cup of bleach to 1 gallon of water) or opt for a specialised mould remover.3. Scrub the Walls: Use a stiff brush to scrub the mouldy areas vigorously.4. Rinse Thoroughly: After scrubbing, rinse the area well with clean water to remove any residue.

Preventing Mould Growth After Painting

To avoid mould regrowth, ensure proper ventilation around the painted area. Additionally, consider using mould-resistant paint to add an extra layer of protection. Regularly inspect your exterior walls for signs of moisture or mould, particularly after heavy rainfall or humidity.

FAQ

Q: What is the best time to treat mould on exterior walls?A: It's best to address mould before painting, ideally during dry weather when the walls can dry completely.

Q: Can I paint over mould?A: No, painting over mould will not solve the problem. It must be treated first to prevent further damage.

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