As you may have guessed, some of the areas of your roof that are most prone to leaks include around your chimney, vents, piping, skylight, dormer window, or the areas where the sloped roof meets a straight wall. This is where flashing comes in! Roof flashing is typically metal and is used over vulnerable areas of the roof to prevent water seepage. When water hits flashing, it is directed away from the area and over the shingles—preventing damage and mold growth. Good flashing maintains a water-tight seal, even when it expands with heat and cold. You will find flashing on asphalt and metal roofs, although metal roofs often have their own distinct style. Flat “rolled roofs” often do not need separate flashing, since the roofing material covers the areas that flashing typically protects. There are several types of common flashing:
  • Skylight Flashing
    • Installed around the entire skylight. It’s important to note that if you have a skylight that is over 20 years old and the flashing needs to be replaced, the window may also need to be replaced. Flashing is no longer made to fit the style of older windows. Seals on skylights also tend to last about 10 years. If you are replacing your roof, it is probably best to replace the skylight too to avoid having to remove and replace a section of roof later.
  • Step Flashing
    • L shaped pieces of flashing. One side is under the shingle while the other attaches to the “wall” or surface. This is used on chimneys, or where walls or planes of a roof meet.
  • Counter Flashing
    • In some cases, this covers the step flashing and is typically in one strip.
  • Apron Flashing
    • Can be found at the bottom of the chimney, skylight, or where a vertical wall and sloped roof meet. This is typically over the shingles so that water cannot penetrate
  • Boot Flashing
    • Used around plumbing pipes that extend out of the roof. These can be plastic, but the metal versions are better.
If you think that your flashing might need replacement, contact us for a free evaluation and estimate, 585-400-7663 or