A pipe clamp has a continuously extending, circularly shaped resilient strip comprising a plurality of outwardly extending nub members. Each of the nub members is separated from each adjacent nub member by intervening pipe gripping sections. The clamp is configured to circumscribe and be compelled against the surface of the pipe by means of the spring like nature of the strip and attached to the pipe by end clips. When pipe insulation encircles the pipe and is positioned on the nub members, the pipe insulation is in spaced relation to the pipe surface and a vapor barrier is formed between the insulation and pipe surface. As insulation is never in contact with the surfaces of the pipe, any “pipe sweat” will not be absorbed by the insulation.