Abstract: A snow barrier for a roof having modular components including brackets that slidingly interfit into rails that extend up and down the slope of the roof. The brackets may be rotated to provide fences of differing heights. A corrugated fence is easily installed by reason of a self-positioning, hooked, upper flange formed along the upper edge of the corrugated fence. The corrugated fence may be modular, being built-up of smaller, corrugated strips. Pads may replace the rails in supporting the brackets or the brackets may be fastened directly to the roof.