Abstract: An apparatus for creating a rough-sawn texture on all four sides of surfaced lumber has two pair of sleds which carry endless loop chains having roughening teeth projecting outwardly therefrom. The sleds have planar faces with slots extending across them that the roughening teeth project through, and in one pair of sleds the faces are oriented vertically and in the other pair the faces are oriented horizontally. One of the sleds in each pair is fixed on a frame which supports the apparatus and the other sled in each pair is slidably mounted in tracks. Thus the distance between the faces can be adjusted so that they abut the sides of a particular size piece of lumber. The chains are carried on sprockets that are mounted on the sled and are driven by motors so that the roughening teeth move across the piece of lumber being processed.