Abstract: In a building having floors or roof resting on peripheral beams supported by columns and non-load bearing curtain walls enclosing the building, the improvement comprising a plurality of vertical members, constituting part of the curtain wall framing, having at least one flange perpendicular to a horizontal member joined to the building, and a plurality of metal clips joined to the horizontal member and securing the vertical member flange against horizontal movement but permitting unrestrained vertical displacement of the adjoining horizontal member relative to the vertical members which are a part of the curtain wall. In this way, roof and floor deflections do not apply compressive forces to the curtain walls.