Joist Bearing on Cold-Formed Steel Studs The Ecospan Composite Floor System blends with cold-formed structural steel walls. With the “built-in” Load Distribution Member (LDM), the Ecospan system can eliminate the need for a separate LDM. Please contact one of our Sales Representatives for further information. Below are example details of the Ecospan system used with CFS walls. Please click on the thumbnails to view the different details.