Mould thrives in damp, stagnant air. Opening windows daily, especially in kitchens and bathrooms, helps reduce indoor moisture. If windows aren’t practical, installing small ventilation vents or extractor fans can make a big difference.
Practical Solutions to Stop Black Mould on Your Cement Block Walls
Black mould is one of the most common and frustrating issues in cement block houses across The Gambia. It not only makes walls look dirty and unpleasant but also creates health risks for families. The good news is that with the right prevention measures, homeowners can significantly reduce or even eliminate mould growth.
Improve Ventilation Indoors
Seal the Exterior Walls
Bare cement block walls absorb water like a sponge. Applying a cement render, lime plaster, or water-repellent coating keeps rain from soaking into the blocks. A breathable finish is best, as it allows moisture to escape without trapping damp inside.
Fix Leaks and Roof Issues
Many mould problems start with leaking roofs, gutters, or plumbing. A small roof leak dripping onto a wall can create a constant damp patch where mould flourishes. Regular inspections, especially before the rainy season, prevent long-term damage.
Control Groundwater and Splash-Back
When rain hits the ground and splashes back onto walls, the lower portion becomes constantly damp. Adding gravel beds, paving, or planting ground cover close to the house reduces splash-back. Keeping the ground sloped away from the house also prevents standing water.
Regular Cleaning and Maintenance
Once mould begins to form, it should be removed quickly with a scrub brush and a mild bleach solution (or vinegar for eco-friendly cleaning). Leaving it unchecked allows it to spread deeper into the wall surface.
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Takeaway
Mould prevention requires a mix of good building finishes, proper drainage, and daily habits. While cement blocks are more prone to mould than CIEBs (Compressed Interlocking Earth Blocks), even block homes can remain mould-free with the right strategies.