How to Repair Leaky Metal Roof Seams


Metal roofs are recognized for durability, quick installation and long life spans. They resist mold, fire, rot and moisture for long lasting stability. However, extreme weather conditions and deterioration can damage metal roofs. Parted roof seams can allow water to leak inside homes and damage their interiors. Leaky roof seams can worsen and create permanent damages the longer they remain unfixed. Promptly restore damaged roof seams to preserve a home's structural integrity.

Things You'll Need

  • Wire brush
  • Flexible putty knife
  • Whisk broom
  • Soft cloth
  • Warm water
  • Soft towel
  • Aluminum-based roof coating
  • Paintbrush
  • Asphalt impregnated glass membrane fabric
  • Scrub the seam with a wire brush to loosen dirt, rust and grime. Scrape off flaking roof coating and other debris with a flexible putty knife. Sweep away the loosened debris with a whisk broom.

  • Dampen a soft cloth with warm water. Wipe the seam with the damp cloth to wash away small dirt particles and dust. Thoroughly dry the seam with a soft towel.

  • Apply an even coat of aluminum-based roof coating over the metal seam using a paintbrush. Follow the roof coating manufacturer's directions on the product's label. Overlap each side of the seam with roof coating by at least an inch. Do not allow the roof coating to dry.

  • Lay asphalt impregnated glass membrane fabric along the length of the seam. Press the membrane fabric into the roof coating. Make sure the membrane fabric overlaps each side of the seam by a couple inches.

  • Apply a layer of roof coating directly over the membrane fabric using the paintbrush. Allow the roof coating to dry according to the manufacturer's directions.

Tips & Warnings

  • Use these same techniques to repair small, narrow cracks on metal roofs.
  • Reseal all flashing seams with urethane roofing cement for extra protection against leaks.
  • Use all proper roof safety gear while on the roof to prevent slipping or falling.
  • Do not attempt to repair the roof during wet, windy or harsh weather conditions; it is unsafe.

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  • Photo Credit Hemera Technologies/ Images
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