Abstract: A truss clamp for connection with a second clamp when installing truss assemblies includes a mechanism for adjustably connecting the two clamps in spaced relation. The truss clamp includes a fixed member and a rotatable member, the rotatable member having first and second ends and being pivotally connected to the fixed member intermediate the ends of the rotatable member and being rotatable between a first position wherein the first end is in confronting relation with a portion of the fixed member and a second position wherein the second end is in confronting relation with the portion of the fixed member. A holding mechanism may be disposed over a center spring action mechanism, for selectively maintaining the rotatable member in at least the second position. A method of installing trusses using a truss clamp is also disclosed.