Abstract: A method of joining two profiled pultruded panels, wherein each of the panels has a base wall and a profiled element having a web extending from the base wall to a head, wherein the method includes: (a) positioning the panels in co-planar relationship to position the webs of the profiled elements face to face; (b) providing an arresting fitting having two co-operating parts, each part having a top component, a flange extending in an acute angle from the top component, and a pair of arresting elements for arresting the two parts in the arresting position; (c) arranging the arresting fitting straddling the two profiled elements while in the open position; and (d) sliding the top components of the two co-operating palts relative to one another for shifting the two parts from the open position to the arresting position.