Shop for Doors & Windows at The Home Depot. The VELUX No Leak Replacement Series Fixed Deck-Mount skylight is ideal for replacing old skylights. It has a 2.75" deck seal to span wider or less accurate roof openings. On the exterior, this skylight features a streamlined design that won't obstruct your roofline, and has protective aluminum cladding in a neutral gray color that blends into most roofs. It also comes with a 10-year No Leak warranty when installed with VELUX flashing.