How to Install a Cover Over an Expansion Joint

Expansion joints, such as those at the peak of a roof, require a cover that will allow the expansion joint to breathe while preventing water penetration. Joint covering is made from a rubber material that is attached to the roof with nails. Typically, multiple sections of joint cover will be required: the number will depend on the length of the joint.

Tape measure
Felt-tip marker
Chalk line
Expansion joint covers
Nail gun
Hammer
Nails
Flashing felt
Mastic glue

Instructions

- 1
  Measure the length of the roof line with the tape measure. Divide this length by the length of a section of the expansion joint cover. This will give you the number of pieces needed for the installation.
- 2
  Measure 1-1/4-inch from the edge of the expansion joint with the tape measure. Mark the spot with the felt-tip marker. Run a chalk line over the mark and along the length of the ridge line. Pull it taut and snap a line.
- 3
  Place the cover over the expansion joint and fold over one of the flexible flanges to expose the nailer.
- 4
  Align the edge of the nailer with the chalk line. Drive nails into the nailer every four inches by using a nail gun, or a hammer and nails.
- 5
  Fold over the flexible flange and align it with the chalk line. This will create a bulge in the center of the cover. Drive nails into the nailer every four inches.
- 6
  Cover the flexible flanges with a flashing felt using a mastic glue. The mastic glue will prevent water penetration beneath the flashing felt.

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