Patrick,
Now that you have brought it back to the original post, you've really done it.
All of the previous discussions have centered around the PVC being exposed to sunlight and UV, which it is not allowed to be blah, blah, blah.
Now for ... a pet peeve of mine ... which I've brought up many times before ... and for which you have opened the door ... (thank you) ... (but the others may not) ...
Anyone out there know where the 'freeze line' is and above that line which *ALL* (yes *ALL*) plumbing outside the thermal envelope of the house is supposed to be insulated?
I've posted it many times before. Yes, this is a test. WC Jerry keep quiet.