How do you properly flash a curb mounted skylight on a residential roof?

by Sep 18, 2019

As with any penetration in a residential roof, properly flashing a skylight is crucial to the longevity of a leak free skylight.  There are curb mounted and deck mounted skylights.  In this blog we are going to talk about the curb mounted skylight.

Curb mounted means a box-like structure constructed with 2” x 4” or 2” x 6” lumber that elevates the skylight off the roof deck. The curb allows the installer to install metal flashing for long lasting, water shedding, and leak free installation.

  • Install Ice & Water shield/peel & stick underlayment down the curb & onto the roof deck
  • Install top flashing, step flashings (properly sized for the shingle) and bottom flashing
  • Be sure to lace the step flashing with the course of shingles
  • Place skylight dome on the curb and secure with proper fasteners

The curb mounted skylight is a nice addition to allow natural light to a room.  If you have consulted and hired a reputable roofing contractor the flashing on the skylight should give you peace of mind from leaks in the future and natural light for years to come.  I hope this helps with your next roofing project.

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