Abstract: A sealing strip for a roof ridge or arris cover, made of soft, easily deformable material and having a center strip zone disposed between lateral strip zones. The center strip zone is adapted for placement on a roof ridge or arris plank and is air permeable. The lateral strip zones are adapted for placement on the top sides of roof cover boards. The center strip zone comprises a center section coming to rest on the roof ridge or arris plank and side strip sections which are sieve-like and air permeable. The adjoining lateral zones are pleated, with the pleating aligned substantially perpendicular to the longitudinal axis of the sealing strip.