LYSAGHT TOPSPAN® 120 is an improved light gauge purlin for use as a substitute for the smaller traditional purlin profiles. The top hat shaped profile has web stiffening and top flange grooves to improve stiffness.It is commonly used in the rural, residential and small commercial market for sheds, garages and awnings where longer spans or strength is required.TOPSPAN® 120 is also used in flooring and shelving applications.