5 Ways Storms Can Damage Metal Roofs

Metal roofing is one of the more storm-resistant materials available, but it's not immune to damage. Learn what sorts of damage to watch for so you can schedule prompt repairs if a problem does occur. 

1. Hail Dents

The good news is that most modern metal roofs are resistant to hail damage. Unlike other roofing materials, there should be no concerns about punctures causing leaks. Hail damage on a metal roof tends to be cosmetic. Small dents or chips to the finish on the metal may occur, but a fresh paint job or roof coating will help camouflage it and prevent rust from affecting the panels. 

2. Edge Uplift

Wind uplift along the edges of a metal roof is much more damaging because entire metal panels can be twisted up and even torn off of the roof. Uplift occurs when high winds hit the side of the house, pushing up under the eaves. If the edge of the metal roofing isn't well secured, it may lift up. Damaged panels will need to be reattached or replaced, depending on the state of the metal after the wind twists it. Using hurricane or wind strapping during the repair can prevent future issues. 

3. Flashing Damage

Flashing, which seals the seams between the metal roof and rooftop penetrations, is one of the weakest links on a metal roof. It's typically made of aluminum or another lightweight material that can be twisted by the wind or damaged by hail. Flashing should be inspected following any major storm. Replacement is cost-effective and completed quickly, while leaks from damaged flashing can be expensive. Prompt repair is advised.

4. Popped Fasteners

A series of winter storms with rapid temperature fluxes between hot and cold can cause issues with the roofing screws that fasten the metal roofing panels to the subroof. The temperature changes can cause screws to slowly back out of the panel, resulting in a gap between the fastener head and its water-sealing gasket and the panel. This allows moisture to leak through. Properly seating and sealing the fasteners helps, but it's still a good idea to have any popped fasteners tightened. 

5. Vent Leaks

Your metal roof has integrated vents to ensure air circulation throughout the attic. These are usually under the eaves and in the roof cap, but there may be other vents on top of the roof. High winds can drive rain through these vents, especially if the storm dislodges the vent covers and rain shields, which results in water leaks inside the house.

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