Abstract: The barrier comprises a vertical strap, a pair of opposing centering elements for guiding extending outwardly from the vertical strap and a pair of brackets inserted into the pair of opposing centering elements for guiding. Each pair of brackets includes a flat, curved element situated in a plane perpendicular to the vertical strap and has at one extremity a cutout. A guiding plate situated in a plane parallel to the vertical strap is attached to another extremity of the flat, curved element. The guiding plate is inserted into opposing centering elements for guiding. A rail is inserted into the pair of brackets, through the cutout of each of the flat, curved element. Several U-brackets are secured to a roof structure and disposed behind the vertical strap embrace a rafter. The roof barrier includes features for attachment the vertical strap with the pair of brackets to U-brackets, through the rafters, to the roof structure.