Mount the cleat that supports the shelf ... Overall dimensions: 36" x 5-1/2" x 5-1/4" The first step in learning how to build wall shelves is to cut the 1-in. band and the cove moldings extra long.
it’s important to figure out what your wall is made of. Ideally, you should attach floating shelves (or anything else you’re hanging) to a wall stud, because it support the shelves’ weight best.