How to Fasten a Roof Flashing After a Reroof

Flashing is a weatherizing material usually made from aluminum or galvanized steel. It is usually applied to roof joints to prevent water from entering a home. Skylights, chimneys, vents, and peaks and valleys commonly require flashing, as will any place where the roof meets the walls of the home. The specific installation process will vary a bit depending on the material it is attached to, but is usually a project simple enough to complete on a do-it-yourself basis.

Ladder or scaffolding
Metal roof flashing
Tin snips
Galvanized roofing nails
Hammer or nail gun
Gloves and eye protection

Instructions

- 1
  Select the material for roof flashing. Aluminum is ideal for bending yourself, as it is easy to work with, though galvanized metal and copper are more durable.
- 2
  Measure the length of the roof, taking into account peaks, valleys and other architectural structures. Most types of flashing are measured in 10-foot lengths; for joints that exceed this measurement, two pieces will require soldering.
- 3
  Cover bricks and masonry, including areas around the chimney and stucco, with a brick sealant. Once it hardens, it will aid in helping the flashing stick to the brick.
- 4
  Cut flashing with tin snips to an appropriate length as needed.
- 5
  Nail flashing into place with galvanized roofing nails. Place nails as near the flashing edge as possible, as nailing it in the middle or at the top will reduce its resistance to water permeability.

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