Abstract: An insulation support truss is formed from a thin strip of spring steel. A V-shaped or trapezoidal notch is cut at each end of the strip and forms two pointed tips. In use, the support truss is snapped in place between two floor joists and serves to retain insulation between the joists. The insulation support truss of the present invention may be installed without the use of any tools, and alleviates the cumbersome and time consuming stapling of wire insulation supports between the floor joists. In a second embodiment of the present invention, a plurality of the insulation supporting trusses may be connected together by support slats. In a third embodiment of the present invention, the insulation support truss may be provided with transversely extending legs provided with a roughened surface for engagement with the sides of a floor joist. The insulation support truss is preferably formed from spring steel and may be provided in different lengths for use with different standard floor joist spacing dimensions.