VELUX FCM 2246 0005 Skylight, 25 1/2" W x 49 1/2" H Fixed Curb-Mounted w/Tempered LowE3 Glass It is sized to work with most types of site-built curbs, wheThe they are slightly out-of-square, pre-existing, or surrounded by unusually thick flashing and roofing material ECL (for shingle roof) and ECW (for tile roof) flashing is sold separately and, when paired with the skylight, gives layers of water protection and makes the skylight eligible for the 10-year No Leak installation warranty Consider upgrading to Solar Powered Fresh Air Skylight (model VSS) to bring both natural sunlight and fr