Chimney flashing repair

Repairing a chimney flashing is a relatively hard task. Actually repairing a flashing means replacing it. It is found under the roof shingles.

First thing you need to do is measure around the chimney to order a right flashing. Go to a sheet metal shop with the measurements. The flashing is made cutting and bending metal sheets. If the flashing is not correctly installed leaks in the roof can occur and damage the house. It is best to properly install the flashing.

Tools and materials needed

  • Hammer
  • Pry bar
  • Replacement flashing
  • Replacement shingles
  • Nails (specific for roof flashing)
  • Water-and-ice barrier
  • Drive-in expanding anchors
  • Polyurethane caulk

Remove shingles/flashing

Remove the roof shingles around the chimney. Use a hammer and a pry bar to take out the tar and the existing flashing. Be careful when handling the flashing.

Replace shingles

Clear any dirt and debris that might be in the area and then replace the shingles you took out with new ones. Seal them with water and ice resistant sealant.

Base flashing

Begin installing the base flashing, at the bottom of the chimney and over the shingles. Each shingle piece must be sealed with a piece of flashing. Make sure the pieces of flashing overlap one another. The pieces must be nailed to the roof edge, 6 inches away from one another.

Front flashing

The front flashing must be bent around the chimney corners. This piece of flashing can be ordered with the specific measurements of the chimney. If you install a basic flashing, it must be cut 8 inches longer than the width of the chimney and nailed into place.

Side flashing

Use drive-in anchors to install the side flashing so that it overlaps each lower flashing piece. use cap flashing at the corners of the chimney.

Cap flashing sealant

Seal the cap flashing using polyurethane caulk on the mortar joints.

Finally, you have an effective chimney flashing that will prevent leaks and save your home.

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