How To Flash A Skylight On Roof

Install the bottom flashing a single piece that wraps partway around the skylight and sits on top of the roof shingles figure 3.

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. Some skylights come with a kit and you don t have to build the aprons and install step fl. Step 3 install the metal flashing.

Number 5 shows how the final step counterflashing is integral to the skylight and covers the upper edges of the roof flashing. 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. 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. Secure by nailing the flashing to the roof.

Custom flashing around a triangle skylight on a metal roof. Drive roofing or flashing nails horizontally into the skylight not vertically into the roof. Then fold the tabs on all sides of the skylight and screw them down. Next slip individual pieces of step flashing under the shingles.

Properly installing a skylight requires detailed skylight flashing. This skylight shows the correct flashing technique to make it waterproof. So notorious that a major manufacturer velux developed flashing kits that could be shipped with the skylight to eliminate origami gone wrong on the roof. Once the metal flashings are ready place the pieces between the roof and skylight above the roof and under the skylight.