10X Oak sleeper beams 18? long. BID PRICE MULTIPLIED BY 10. Sleepers are most typically used for floor joist in a barn. They are often hewn on the top and bottom and have natural edges on the sides. Some of these beams are hewn on only one side and the rest left natural. Beams range in size from 8??x8??x18? hewn one side and 7??x10??x18? hewn two sides. Located in Groveland, for more information call Steve at 585-645-4953.