Advice & Technical Support.
🌧️ Top Reasons Why Metal Roofs Start Leaking (And How to Fix Them!)
Metal roofs are known for their strength, long lifespan, and modern look — but even the toughest metal roofs can develop leaks over time. Whether it’s your home, warehouse, or commercial building, a small drip can quickly become a major problem if left unchecked.
At Miya Paint & Waterproofing, we’ve seen it all — from rusted screws to poor installations — and we’re here to explain why metal roofs start leaking and what you can do about it.
🧱 1. Improper Installation
The number one reason for leaks? Incorrect installation.
If the roofing sheets are not aligned correctly, or the fasteners are over-tightened, water can sneak through tiny gaps. In some cases, installers fail to use the correct sealing washers, leading to slow but persistent leaks.
💡 Tip: Always hire certified roof specialists who understand proper screw placement and sheet overlapping techniques.
🔩 2. Loose or Missing Fasteners
Over time, screws can loosen due to wind vibration, heat expansion, or age. When that happens, water can enter through the fastener holes.
🧰 Solution: Have your roof inspected annually to replace missing or rusted screws and to reseal any washers that show wear.
🌧️ 3. Rust and Corrosion
Even with protective coatings, metal roofs can rust — especially in coastal or industrial areas where salt and chemicals attack the metal. Rust weakens the panels, creating pinholes that leak.
🎨 Miya Paint Tip: Apply an anti-rust primer and waterproof coating every few years to extend your roof’s lifespan and protect against corrosion.
🌬️ 4. Poor Sealing Around Joints and Flashings
Flashing is used to seal joints around chimneys, vents, and skylights. When flashing is poorly installed or becomes brittle, water easily penetrates the weak points.
🔍 Fix: Re-seal with high-quality waterproof sealants or flexible membranes designed for metal roofs.
🌡️ 5. Thermal Expansion
Metal expands when it’s hot and contracts when it cools. Over the years, this constant movement loosens joints, fasteners, and seams, leading to leaks.
⚙️ Prevention: Use flexible sealants and expansion joints during installation to accommodate temperature shifts.
🧽 6. Neglected Maintenance
A roof left unattended is a leak waiting to happen. Leaves, bird nests, and debris trap moisture, leading to corrosion and water backup under sheets.
🧹 Routine Care: Clean your gutters and remove debris from the roof twice a year — especially before and after rainy seasons.
🔧 Final Word from Miya Paint & Waterproofing
Metal roofs don’t just fail overnight — leaks are symptoms of small issues left untreated. With regular inspection, proper coatings, and professional waterproofing, you can keep your roof strong and leak-free for decades.
At Miya Paint & Waterproofing, we specialize in metal roof waterproofing, repairs, and protective coatings using advanced materials that stand up to South Africa’s harsh weather.
💬 Call or WhatsApp us today for a free roof inspection and professional leak fix!
📞 Tel: 066 036 1296
🌐 Website: www.miyaconnection.co.za
📍 Service Areas: Gauteng, Vaal Triangle, and surrounding regions