How to Install Step Flashing

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Installing step flashing will prevent water leaks in your roof. This technique is designed to prevent not just downward-falling water, but also water that is pushed up by wind or debris, which gets under your shingles and causes rot. Step flashing installs along the walls around the roof, forming a barrier between the roof surface and rain. This important step keeps your home safe from the intrusion of water all year round.

Things You'll Need

  • Step flashing
  • Hammer
  • Flashing nails
  • Caulking
  • Tin snips
  • Cut a piece of the step flashing at a 45-degree angle up to the point of the bend in the flashing piece and then bend the flashing in half at the point of the bend to create a corner section. Set this on the corner of the wall that rises up off of the roof. Nail the flashing to the wall boards using flashing nails and a hammer. Do not nail the flashing to the roof boards.

  • Apply sealant caulking on the flashing piece over the corner that is attached to the wall and across the flat surface that is on the roof. Anywhere the next flashing section will contact the corner flashing piece, you must apply sealant.

  • Bend the second piece of flashing along the top at what is called a "plumb line." Just bend the corner back at a 90-degree angle so it overlaps the first piece of flashing. Then install this piece of flashing over the corner piece. Nail it to the wall (not the roof) near the end of the flashing piece with a hammer and flashing nail.

  • Install your row of shingles over this piece of flashing, and then install another section of step flashing over the second piece and on top of the first shingle in the row.

  • Continue to install alternating flashing pieces and shingle rows to "weave" the flashing and shingles together as you work up the roof. When you reach the top, cut the section of flashing that will go across the peak along the plumb line, bend the section into a peak shape and install it as you have the other sections. Then continue back down the roof on the other side, alternating flashing and shingles as you go.

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References

  • Photo Credit Roof image by Mohd Haka Khambali from Fotolia.com
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