A support assembly for a work surface is disclosed. The support assembly may be secured to at least one gable. The support assembly includes an elongate horizontal support having a predetermined cross-sectional shape a saddle support which supports the work surface. The saddle support has a recess with a shape which corresponds to the predetermined cross sectional shape of the horizontal support. The recess receives the horizontal support therein to securely rest the saddle support on a top portion of the horizontal support. A U-shaped fastener secures an upper member of the horizontal support to an upper portion of the recess.