We also hear sounds as our roof moves...

I'm not sure your water pipes would necessarily be the cause, for we've noticed similar sounds in our place. In our case, I *think* the sounds started to appear when we repainted the ceilings to cover water stains (from a rainstorm during a reroofing). My current suspici We'd also gotten the old roof ripped off and replaced with a foam roof a couple years ago, so in our case it also might be caused by the new roof or by extra movement when the roof's a couple tons lighter.

Robert