Top 5 Common Causes of Metal Roof Leaks and How to Fix Them
Metal roofs are known for their strength, durability, and long lifespan, but even the best systems can experience leaks if not properly installed or maintained. When a leak occurs, identifying the cause quickly is key to preventing costly repairs and water damage. At Jackson Metal Roofing Supply, we understand how important a reliable roof is for Georgia homeowners and contractors. Below are the five most common reasons metal roofs begin to leak and what you can do to fix or prevent each one.
Fastener and Washer Failures
Fasteners are the screws that hold your metal panels in place. These screws are often equipped with rubber washers that seal the holes and prevent moisture from entering. Over time, however, these washers can wear down due to exposure to heat, sun, rain, and expansion and contraction from temperature changes. In Georgia’s climate, which sees both high humidity and hot summers, these rubber components may crack, dry out, or shift position. When this happens, small openings can allow water to seep into the roofing system.
Loose screws can also be a problem, especially if they were not tightened correctly during installation. If a screw backs out slightly, it may no longer create a watertight seal, increasing the risk of leakage. To resolve this issue, it is important to inspect your roof’s fasteners regularly. Replace any missing or damaged screws and make sure that all washers are intact and snug. When in doubt, consider using long-lasting fasteners designed specifically for metal roofing systems to improve durability.
Improper Seams and Panel Overlaps
Metal roofing panels are designed to overlap in a way that prevents water from penetrating. However, if the overlap is not sealed properly or the panels shift over time, even a small gap can allow rainwater to enter. One of the most common leak points occurs where two panels meet. Water can be pulled into these seams through a process called capillary action, which allows liquid to flow into tight spaces, especially when panels are exposed to wind-driven rain.
Improper installation is often the root cause. If panels are not properly aligned or if the sealant between seams fails, moisture can begin to collect underneath. Over time, this can damage insulation, underlayment, or even structural supports.
To correct this issue, inspect all seams and overlaps for separation, rust, or old adhesive. Clean the area and reapply metal roof sealant or butyl tape designed for high performance in both heat and moisture. If shifting has occurred, the panels may need to be reseated or reinforced to maintain their weatherproof integrity.
Damaged or Missing Flashing
Flashing is used to cover joints and edges around penetrations such as chimneys, vents, skylights, and roof valleys. It plays a vital role in directing water away from vulnerable spots and into the gutter system. If the flashing is not installed correctly or has deteriorated over time, it can create an entry point for water.
Strong winds, tree branches, and age can all damage flashing. If flashing becomes dented, rusted, or detached from the surface, it no longer performs its job effectively. In some cases, the flashing may be completely missing in areas that were never properly sealed during the initial installation.
To fix flashing issues, inspect the metal edges around your roof’s transitions and penetration points. If the flashing is loose, it should be re-secured using fasteners and sealant. If it is rusted or bent, replacing it is the best option. Always use flashing materials that are compatible with your roofing panels to prevent corrosion or galvanic reactions. Jackson Metal Roofing Supply can custom-fabricate flashing in a variety of profiles to meet your exact needs.
Deteriorated Sealants and Butyl Tape
Sealants and butyl tape are often applied at critical points on a metal roof to add extra protection. These materials are commonly used around skylights, pipe boots, panel ends, and ridge caps. While they are durable, they are not permanent. Over time, sun exposure and moisture break down the chemical bonds in sealants, causing them to crack, shrink, or peel away from the surface. Once a gap forms, water has an easy path into your home or building.
Neglecting these sealants is one of the most common causes of slow leaks that go unnoticed until visible water damage appears indoors. Regular roof maintenance and inspections can catch these issues early before they lead to mold, ceiling stains, or rotting wood.
To repair or replace deteriorated sealant, clean the affected area thoroughly, remove old residue, and apply a new high-quality product that is rated for metal roofing. For better long-term performance, use tapes and sealants that are UV resistant and flexible enough to expand and contract with the roof throughout the seasons.
Rust, Corrosion, and Physical Damage to Panels
Although metal roofs are manufactured with protective coatings to resist rust and corrosion, harsh weather, salt air, standing water, or scratches can still break down the finish over time. Once the protective barrier is compromised, rust begins to develop. If left untreated, it can eat through the metal and lead to pinholes, cracks, or complete panel failure.
Physical damage is also a concern. Hail, falling branches, foot traffic, or improper installation can bend panels or puncture them. These weak spots often allow water to pool or seep through unnoticed.
To prevent rust-related leaks, keep your roof clean and clear of debris. Trim nearby trees, clean gutters regularly, and inspect for signs of surface wear. If rust is minor, it can often be cleaned off with a wire brush and treated with rust-inhibiting primer followed by a fresh layer of paint or sealant. Severely corroded panels should be replaced to avoid ongoing water damage.
Trust Jackson Metal Roofing Supply for Long-Term Solutions
Whether you are dealing with a small drip or a major leak, the key to protecting your structure is identifying the source quickly and making the right repair. At Jackson Metal Roofing Supply, we provide high-quality materials, expert guidance, and custom fabrication solutions to keep your roof watertight and strong.
From new builds to roof upgrades and everything in between, we are proud to support contractors and homeowners throughout Jackson, Forsyth, and the surrounding Georgia communities. If you are seeing signs of a leak or want help with a roof inspection, contact us today. We are here to help your roof last for decades.
