A method for applying a clamp for a construction strut that allows a pipe to be clamped to the construction strut in which the clamp has a fastener that is not exposed above the clamp curvature and in which the fastener head is easily accessible. Also the clamp has a retaining tab and a neck portion such that it can be installed by straight-in insertion at the top of a construction strut. Also, the method has an embodiment in that the clamp can be installed either on the open side of the construction strut or on the closed side using slots in the closed side by straight-in passing the retaining tab past the inturned flanges on the top of the construction strut and by a rotation at the bottom of the construction strut.