Counterflashing helps keep moisture away from your chimney and other pipes. They protect the rest of your roof from water damage, but they can be difficult to replace. It's hard to put the counterflashing in place without breaking the shingles around it, but it is possible.

  • Step 1: Bring the new counterflashing, roofing nails, calking gun, hammer, and a crowbar up to the roof.
  • Step 2: Loosen up the shingles and find the nails that are in your way. Allow the shingle to rip wear the nail is so it falls through.
  • Step 3: Maneuver the counterflashing underneath the shingles and place it over top of the old roof flashing.
  • Step 4: Cut the shingles so that it fits against the flashing.
  • Step 5: Use the caulking gun to apply asphalt flashing cement around the edges.

If the area is still leaking, the counterflashing may not be the problem. Keep checking the roof for other possible leaking areas.

Breaking Shingles While Counterflashing

If you accidentally break a shingle while installing the counterflashing you will have to replace it. Remove the broken shingle and nail in a new one in the same spot. Next time remember that shingles are very brittle and don't stand up very well to bending.