Fits a roof pitch of 15&8211;90 degrees, Moisture resistant &8211; ideal for rooms with high humidity, VELUX roof windows are best weatherproofed using VELUX window flashings, VELUX patented corner brackets ensure fast & secure installation, Ventilation flap can be operated with the window closed, Requires less maintenence than natural pine finish, High quality moulded polyurethane with white lacquer finish & timber core, Forest friendly timber frame, High quality timber core with mouled polyurethane finish