So there are 3 distinctly different skylight mounting designs: flange mount (the style that I am replacing), deck mount (where the skylight mounts directly to the roof deck, uppermost piece of the flashing kit fits under the shingles and over the upper edge of the skylight) and curb mount where the skylight mounts to a framed curb (the curb is.. Deck Mounted Skylights. Suitable for roof slopes equal or greater than 14° or 3:12. Deck mounted skylights are a more recent design that lowers the profile of the unit and increases the energy efficiency by 'hugging' the roof. In this design, the curb is the skylight itself. Higher quality manufacturers, such as Velux, have perfected the.

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Deck-mounted skylights. A deck-mounted skylight is directly attached to the roof deck. It comes with a built-in frame/curb, and you need to seal i, using waterproof materials (underlayments). A flashing kit is also used to cover the seam and the underlayment, to make the installation water-tight. The flashing system varies with brands.. On the other hand, a deck-mounted skylight is best for roofs with a slope of 14 to 85 degrees. In terms of aesthetics, a deck-mounted skylight has the edge because of its clean look. Plus, they are hidden from the outside of the house. Remember, a curb-mounted skylight has a wooden frame, which makes it noticeable.