The maker calls this the “no leak skylight” and is offering a 10-year installation, a 20-year warranty on the glass seal, and a 10-year warranty for the skylight and flashing to prove it. The company redesigned the line with three layers of water protection, including a new gasket that seals to the roof deck. It also features energy-efficient glass and pre-painted frames. Cost: $227 for a 2-foot-by-four-foot, non-venting unit. Velux America.