Curb Mounted vs Deck Mounted Skylights.

Side-by-side comparison of skylight mounting types on asphalt shingle roofs, showing a raised curb-mounted skylight with metal flashing on the left and a low-profile deck-mounted skylight on the right.

The key difference between curb-mounted and deck-mounted skylights lies in how they are installed and attached to the roof. Curb-mounted skylights sit atop a raised frame (the curb) built on the roof. Deck-mounted skylights mount directly to the roof deck.