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Skylights and roof windows

Any glass structure that admits natural light through a roof can be called a skylight. Some manufacturers use the term roof window to describe a relatively large skylight placed low enough to see into the landscape. Roof windows are generally big enough to be considered an escape route in case of a fire.

Many skylight and roof window designs are being sold. Most provide their own instructions for flashing of the curb on which the skylight is mounted. The skylight curb is flashed much like a chimney. Installing self-adhesive underlayment up onto the curb is recommended. An apron flashing with a hemmed lower edge is installed on the base. A step flashing is installed on the sides; base flashing is installed upslope, holding one course of shingles away from the curb to encourage rain to wash away dirt and debris. The skylight itself provides the counter flashing or cap.

Single pitch ridge – shed roof

Occasionally, shingles are installed on a single pitch ridge (shed roof). The off flashing on a single pitch ridge turns down and just covers the top edge of the fascia board. It goes over the top and sits on top of the top course of shingles; it appears to have a layer of roofing cement under it.

Roof pitch transitions

The flashing used for pitch transitions is essentially the same whether the step pitch is on the high side, as in a porch transition, or on the low side, as on a mansard roof. The problem area is the termination of the lower course of shingles, where all the nails must be covered with transition metal strip. Therefore, the flashing must be placed under the shingles of the high slope, and overlap the fasteners on the face of the terminated shingle in the course below the transition.

Metal valley option

Roof valleys are where two sides of the roof meet, which will be the case in any gable or hip roof that has multiple roof sections. One of the installation options for open valleys is the method with the metal flashing instead of a mineral-surfaced roll. The metal flashing for roof valleys should be minimum 26-gauge (0,45 mm) galvanized steel or equivalent non-corrosive, non-staining metal with a minimum width of 60 cm. If you apply the metal valley flashing with a splash diverter and water guards on the sides which are fixed with the metal cleats, 50 cm width is permitted. Performed “W” style valleys are preferred because the center crimp helps relieve stresses on the metal without forcing the metal to buckle. The “W” shape valleys help to brake and divert water on the sides.