Deck Mounted- The skylight’s deck seal is nailed directly to your roof deck for a low profile, energy-efficient installation. Deck mounted skylights are best for roofs with a pitch between 14 and 85 degrees. Photo of Velux deck mount - http://velcdn.azureedge.net/~/media/marketing/us/img/940/deck-install.jpg?h=940&la=en&w=940&cc=grid_6&sw=960
Curb Mount- The skylight is mounted on a wooden frame, known as a curb, that the installer builds around the opening on your roof. Curb mounted skylights are ideal for flat roofs up to a pitch of 60 degrees. Photo of Velux curb mount-
