Abstract: A plank assembly for use in an attic safely supports an individual on an attic surface whether moving across or remaining stationary on the surface. The assembly includes a plank having a top surface opposite a bottom surface and a perimeter edge extending between the top and bottom surfaces. The plank is configured for coupling to a pair of joists supporting an attic when a top side of the joists abuts the bottom surface of the plank. A pair of extensions is coupled to the plank. Each of the extensions is coupled to opposite ends of the perimeter edge. Each of the extensions is slanted downwardly relative to the top surface of the plank. An inner side of each of the extensions is configured for positioning above an outer side of an associated one of the joists.