water leak detection in a crawl space

[Mark Boegemann]

I have a 40 yeaar old house with copper pipes, and a crawl space, in the last six months Ive had 2 leaks spring up in long runs of the copper.  I've asked the local home depot plumber about it and he says its due to expansion in the cold (its the end of summer)   I don't know weather to replace the pipes, insulate the pipes, or what?  If I insulate like the home depot guy said is there a way to monitor this if it should leak again to minimize damage?  Please help 

Thank you 

Mark A. Boegemann