What’s the difference between concealed and exposed fasteners?
There are a number of variations of concealed fastener systems. For low slope structural systems, panels are overlapped and lockformed or snapped together at the seams and held down with clips, one end of which is overlapped in the seam and the other end fastened to the structural member of the roof. The clips have a sliding feature that permits the roof panels to “float” during expansion and contraction from ambient temperature changes.
