An apparatus and method is described for applying a siding or facing to an internal or external surface of a wall, enclosure, or other building construction to simulate a solid debarked log wall construction that includes varying diameter non-uniform logs. The invention further pertains to a lightweight yet rigid assembly that closely resembles at least a portion of a solid debarked log and includes longitudinal segments that may be coupled together to a backing material to create a siding or facing that simulates the exterior of a log whose circumference may be varied.