Metal roofs are increasingly popular due to their durability, aesthetic appeal, and longevity. However, that doesn’t mean they are completely immune to damage and leaks. A metal roof is not designed to be waterproof, rather it is designed to shed water easily. That means there should never be standing water for an extended period of time on the metal roof. Think ice dams, clogged gutters, or poor roof design.
Searching for a leak in a metal roof can be overwhelming but is much easier when you know where to look and what to look for. This guide is meant to help you identify weak areas in your metal roof that may need maintenance and demonstrate how to find a leak in a metal roof.
Signs That May Indicate a Leak in a Metal Roof
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Rust on the Surface of the Roof
Metal roofs have a lot of pros, but one con is staying on top of rust. rust on the surface of a metal roof is not a guarantee there is a leak. However, rust can destroy the roof’s protective coating, leaving holes which can lead to a leak in the metal roof. If you notice rust on your roof, be sure to inspect for leaks and consider applying a rust stopper to prevent it from spreading.
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Improper Roof Movement
Like lots of elements of a properly built home, a metal roof is designed to move a bit. It is imperative for a roofing contractor to ensure the proper design of the entire metal roofing system. Thermal expansion is incredibly important for metal roofs installed in an area like Montana where temperature fluctuations can be extreme. Incorrect install, repair work or damage to panels can inhibit this movement and cause water to penetrate the metal roof.
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Issues with Fasteners
Clips and fasteners with rubber grommets are the two types of attachments used on metal roof panels. Clips fasten directly to the purlin, where the fasteners are more concealed after the panels are seamed and crimped together. This is the more ideal way to keep water out of your home, used in standing seam metal install. Exposed fasteners (with rubber washers) fail over time. The rubber cracks and wears down between the metal panel and the washer over time due to exposure to the elements. If not properly maintained, the gaps between the metal panel and washer exposes the roof to water leaks.
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Holes or Dents in the Roof
Foot traffic can end up creasing or denting the metal panels. This can cause water to pool and eventually leads to rust, holes, and leaks if not properly repaired or maintained.
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Improper Materials or Installation
It is very important when having a metal roof installed to use skilled contractors who know which materials and techniques are required for proper installation. If improperly installed, the seams along the metal panels can lift up and allow water to drip under your roof. This not only causes leaks, but can lead to severe structural and interior damage to your home.
Finding the Leak in a Metal Roof
As we’ve learned above, metal roofs can leak for different reasons, but you’ll most likely find the source of a leak in a few key places: the body of the roof, the transition points of the roof, near penetrations, or in the termination details.
Body of the Roof Check for:
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Puncture holes from weather or debris
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Rust damage
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Missing, misaligned, loose or overly tightened screws
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Metal roofing panels that have shifted out of place
Transition Points
Where one section of roof connects with another. Pay close attention to the valleys of your roof and check for:
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Missing sealant or missing butyl tape
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Loose trim or gaps
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Missing, misaligned, loose or overly tightened screws
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Misalignment where panels overlap
Roof Penetrations
Penetrations of a roof include any place where pipes, vents, skylights, chimneys, or any other type of mechanical support pass through the roof. Check for:
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Cracked seals on flashing
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Gaps in trims around corners of penetrations
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Decaying sealants
Termination Details
A place on a metal roof where the metal roofing stops. This includes the gaps and trims of the roof. Check for:
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Loose or missing caps
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Water running under the caps
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Gutter damage
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Flashing damage
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Decaying sealants
Have Questions? Reach Out and Ask!
If you’re worried about a leak in your metal roof, reach out to the experts at Fly Roofing, LLC. We have experience installing and repairing a variety of types of metal roofs. If you’re interested in scheduling a roofing consultation, visit us online today!