How Do I Install Roof Flashing Where the Trim Meets the Roof?

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Flashing that is designed to go around the edge of the roof to help keep the roof from leaking is commonly known as drip edge flashing. Such flashing can be placed under or on top of the roof shingles, depending on how the rainwater runs. The most common option is to install the flashing under the shingles along the edge, where the trim meets the roof. The proper time to do this is before the shingles are attached.

Things You'll Need

  • Drip edge flashing
  • Ladder
  • Measuring tape
  • Tin snips
  • Pneumatic nailer
  • Broom
  • Measure the length of the area where drip edge flashing will be installed. The measurement is the total length of the roof's edge. Cut the flashing to the desired lengths; this can be done with tin snips. Most pieces come in 10-foot sections and can easily be cut to size.

  • Clean the edge of the roof to remove dirt, dust and debris--any objects that will get in the way of installation. Use a broom to sweep off the roof to make sure the surface is completely smooth and dry.

  • Lay the first piece of drip edge flashing across the edge of the roof. Nail it in with a pneumatic nailer using 1 1/4" galvanized roofing nails. Lay the second piece next to the first piece, overlapping by a few inches and nail this down the same way. This joins the two pieces together. Do this along the entire front and back edges of the roof.

  • Set the drip edge along the sides of the house. Start at the front, making sure it overlaps the flashing at the front corner of the house. Nail it into place and continue along the side to the back edge. Cut pieces to size as needed and overlap the side and back edges just like at the front. Make sure the flashing is completely covering the entire edge of the house and is overlapping so there are no gaps or cracks. Complete all steps before moving on to the shingles.

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