Abstract: Disclosed is a safety barrier system for use at construction sites. An inventive, simple to use, reusable, efficient to assemble and disassemble safety guard rail system for use in construction of multistory structures, primarily multistory apartment complexes is described. The inventive system allows for common 2?×4? or 2?×6? wooden posts to be used for a railing system. The system includes a single reversible centerline safety rail, or guard rail post having apertures on its central region, and keyholes along the folded edges thereof. The post may be installed on any horizontal or vertical surface that is usually above the ground. In operation, the guard rail post is mounted on a flat surface, such that a keyhole engages with a fastener attached to the flat surface. Guard rails are received in the apertures formed on the support plate to create a safety rail arrangement.

Abstract: An interlocking roofing panel is disclosed. The panel has longitudinal edges and large and small dikes extending along these edges. These dikes interlock to form a standing seam. Upon installation, the top wall of the small dike is sufficiently spaced below the top wall of the first dike of an overlapping longitudinally adjacent panel, defining an "upper gap," to interrupt movement of water between the dikes. Also, the small dike features a concave portion which opens towards the primary panel portion and the first dike has a linking portion, so that the linking portion extends into the concave portion while being sufficiently spaced within the concave portion, defining a "lower gap," that, during installation, upward movement of the first dike relative to the small dike is permitted.