Hello. As I understand it, when water freezes in the water pipes, the point of burst is usually downstream from the freeze and due to excessive pressure build up in the pipes. In other words, pipes burst not due to the freezing itself but due to pressure that builds up in the non-frozen section where water is still in fluid state. I was wondering whether the installation of pressure relief valves downstream can help to reduce or eliminate pipe bursts? I have googled but haven't found anything about this which is puzzling since it seems to me that pipes: freezing--> too-much-pressure--> bursting............. well, it seems like a pressure relief valve installed in the insulated space would be the perfect prescription to combat this problem. What am I missing here?