This skylight shows the correct flashing technique to make it waterproof.
How to flash a skylight on roof.
Numbers 1 4 correspond to the 4 photos above.
Custom flashing around a triangle skylight on a metal roof.
Step 3 install the metal flashing.
Custom flashing around a triangle skylight on a metal roof.
Secure by nailing the flashing to the roof.
Install the bottom flashing a single piece that wraps partway around the skylight and sits on top of the roof shingles figure 3.
Repeat to install the flashing to all sides of the skylight frame.
Finally the top flashing gets interwoven with the underlayment that covers the roof surface and the roofing material is added back around the skylight with a 2 4 inch gap between the top of the flashing and the bottom of the shingles.
Flashing is the key to a skylight that won t leak water into the roof cutting a hole in a perfectly water tight roof is asking for trouble and true to form skylights are notorious for leaking.
Number 5 shows how the final step counterflashing is integral to the skylight and covers the upper edges of the roof flashing.
Properly installing a skylight requires detailed skylight flashing.
Then fold the tabs on all sides of the skylight and screw them down.
Drive roofing or flashing nails horizontally into the skylight not vertically into the roof.
Next slip individual pieces of step flashing under the shingles.
Demonstrating how to properly flash a skylight.
Once the metal flashings are ready place the pieces between the roof and skylight above the roof and under the skylight.