Why Does My Wall Leak Every Rainy Season? It’s one of the most frustrating problems for homeowners and tenants in Nigeria: water patches, bubbling paint, and mold appearing on walls every rainy season. But why? Common Causes: No protective exterior wall coating Use of regular paint instead of water-repellent coatings Hairline cracks in plaster letting in moisture No water sealant used during construction Solution: Use of breathable, flexible exterior waterproof coatings Waterproof grouting for crack repairs Periodic inspection of roof and wall joints before rainy season Tip: If you can see bubbling paint or a musty smell in one section of your wall, it’s already too late. Prevention must start from the outside. .