Leaks in metal roofs are common, but they may be quite expensive. If a leak goes unnoticed and untreated, it can cause moisture to build up on interior walls and ceilings, roof supports, and even the structural supports that hold the structure up. Moisture can lead to the rusting or decaying of various building materials over time. In addition to fostering microbial development, standing water within a structure can have a serious negative impact on air quality and human health.

At Shumaker Roofing, we are aware of how important an impenetrable metal roof is to the moisture protection of your building. Our sealing materials are made especially to endure the harsh weather and corrosion that are frequently encountered in outdoor roofing applications. This page addresses typical reasons for leaks in metal roofs, fixes for them, and measures to stop leaks in the future.

the image depicting common metal roof leak issues.

Common Metal Roof Leak Issues

The roofing screws used to fasten the panels to the building’s frame are the most frequent source of leaks in metal roofs. The screw type, installation technique, and angle can all have an impact on how well the roof functions in the long run. Although they make a hole in the roof, metal roofing screws usually do not seal the breach. Screws that are over-driven, under-driven, or put at an angle create an opening for moisture to seep beneath the metal panels, even in cases when sealant is used. 

Other factors contributing to leaks in metal roofs besides improper screw design and installation include as follows: 

Bad Screws: Metal roofing can get an opening due to poorly functioning screws that break or have misaligned threads. Rubber washers deteriorate and lose their sealing abilities with time.

Missing Sealants: Sealed hardware or liquid sealants are used in high-quality metal roofing systems to stop leaks from occurring at screw holes, panel seams, and other weak spots. The wear caused by the environment over time necessitates replacing these sealants.

Overlapping Seams: If the metal roofing is not put in a flush manner, there may be an area where liquid collects and seeps into the building’s interior.

Stack and Curb Flashings: Flashings are rubber boots that encircle extruding pipes or plastic sheets that sit just beneath a building’s exterior walls and roof. They serve as a barrier to keep moisture out of the building’s interior. Insufficiently sealed exteriors can lead to harmful moisture leaks caused by poorly installed or absent flashing.

Misplaced Screws: Occasionally, wayward screws intended for struts or wood framework may go off course and puncture the roof, leaving an unanticipated hole that is simple to miss.

the image depicts a realistic scene of a metal roof repair in action.

How To Fix Your Metal Roof Leak

When you install a metal roof, it’s essential to verify that all screws are correctly in place. If you notice any leaks around the screws, addressing this problem promptly is crucial. While applying an external sealant can provide a temporary fix for metal roof leaks. These surface applications tend to deteriorate over time. A more robust solution involves using specialized sealing hardware like APM Hexseal’s Seelskrews, Seelbolts, Seelnuts, and Seeloc Washers. These stainless steel components are designed with rubber-bonded threads and surfaces, fulfilling both fastening and sealing functions. They effectively seal leaks around metal roof screws automatically, eliminating the need for additional hardware or liquid sealants. Additionally, for enhanced protection of your installation and construction equipment, consider our range of metal-to-rubber bonded washers, sealing boots, and bushing seals, designed to safeguard equipment controls.

image showcasing various roofing sealing products

Sealing Products

When you encounter leaks around the screws of your metal roof, APM Hexseal offers a range of robust and corrosion-resistant sealing options designed to withstand harsh environments. Our specialized hardware, including sealing boots and bushing seals, is crafted for optimal performance under severe conditions. These sealing fasteners are not only effective in addressing current leaks but are also crucial in preventing potential future leaks. By utilizing our durable sealing solutions, you can enhance the longevity and reliability of your metal roofing system.

Sealing Boots and Bushing Seals

Alongside our robust sealing fasteners, we also provide an extensive range of molded sealing boots. Designed to safeguard electrical components from environmental hazards. Furthermore, our inventory includes high-quality bushing seals specifically engineered for switches and push buttons. These products ensure enhanced durability and reliable protection against moisture and dust. Maintaining the integrity and functionality of your electrical systems. We tailor our offerings to meet the demanding requirements of various industries. Ensuring that your equipment operates efficiently and remains protected in all conditions.


In conclusion, metal roof leaks can lead to severe damage and costly repairs if not addressed promptly. At Shumaker Roofing, we understand the critical nature of a well-sealed metal roof to prevent moisture penetration and protect your building. Our specialized sealing materials are designed to withstand extreme conditions and are integral in preventing and addressing leaks. From the correct installation of roofing screws to the strategic use of sealants and overlapping seams, every measure is vital. By using advanced sealing solutions, like our robust sealing boots and bushing seals, we ensure your roofing system is secure, durable, and able to stand up to environmental challenges, thereby safeguarding your property’s structural integrity and indoor air quality.

FAQs on Common Causes of Metal Roof Leaks

1. What are the most common reasons metal roofs leak? 

Several factors can cause metal roofs to leak, including improper screw installation, failed sealants, misaligned overlapping seams, and environmental damage that deteriorates the roof materials over time.

2. How can improper installation of screws cause leaks in metal roofs? 

If screws are over-driven, under-driven, or installed at an incorrect angle, they can fail to seal the roof properly. Allowing moisture to penetrate and lead to leaks.

3. What role do sealants play in preventing metal roof leaks, and why do they fail? 

Sealants are crucial for sealing gaps and seams in metal roofing but can fail due to aging or exposure to harsh weather conditions. Which reduces their effectiveness in preventing leaks.

4. Can the design of metal roof panels affect their likelihood of leaking? 

Yes, the structural design and how the panels interlock can significantly impact the roof’s ability to prevent water ingress. Poorly designed or installed panels can create vulnerabilities where water can seep through.

5. What are the best practices for preventing leaks in metal roofs? 

To prevent leaks, it is important to ensure proper installation and regular maintenance. Using high-quality screws and sealants, conducting routine inspections, and addressing minor issues promptly can help maintain the roof’s integrity.