How to Flash a Brick Chimney


Installing flashing around your brick chimney is one way to prevent moisture from damaging other parts of your home. For the best water protection, you should also consider valley and step flashing. Keep your old flashing to use as a template for your current flashing and bend and cut your new flashing to the appropriate size. You should always wear heavy gloves when handling flashing, as it is sharp enough to leave injuries. Only work on dry, temperate days for the best results with your materials and for your own safety.

Things You'll Need

  • Aviation snips
  • Caulk gun
  • Roofing hammer
  • Galvanized metal flashing
  • Roofing cement
  • Roofing nails
  • Rubber-gasket nails
  • Place shingles up to the base of the chimney, and put roofing cement at the chimney's base and shingles located at the base. Bend the counterflashing, which is located in the chimney and used to cover the step flashing, upward. Push base flashing into roofing cement and curl the flashing around the edges of the chimney. Drive flashing flange into the roof deck using rubber-gasket nails.

  • Place step flashing and shingles, starting from the bottom and working your way to the top of the chimney. Use roofing cement to secure flashing against the chimney. As you work, fold the counterflashing downward.

  • Cut top flashing and put it around the chimney's high side. The last piece of flashing should overlap on each side. Use roofing cement to secure it against chimney, driving rubber-gasket nails through the flashing base and into the roof deck.

  • Shingle past the chimney, and use roofing cement to secure shingles in place. Place shingles over the flashing.

Tips & Warnings

  • Working on a wet, hot, or cold day could affect the results of your work. Materials like shingles and roofing cement could be affected. When shingles are cold, they grow brittle and break. When shingles are wet, they may become too soft to properly handle.
  • Carry a spare pair of gloves while working with flashing. If you are cut or injured, use first aid. If bleeding continues, contact professional medical help.
  • Use roofing cement as an emergency repair to cover any cracks along your chimney or in your current flashing until you can afford professional repairs. Emergency repairs
  • can minimize damage to your property.

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  • "Ten Pound Books: Home Repair Guide"; Creative Publishing International, Inc.; 2007.
  • Photo Credit chimney image by hazel proudlove from
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