PEX piping question for plumbers

dougrainer wrote:

John&Joey wrote:

Chris Bryant wrote:
..I have found PEX is not at all good with UV...

PEX is big up here in the frozen Tundra. Easy to work with, cheaper then copper, and takes one heck of a freeze. PEX comes out and says it is not UV stable. If you have to have it outside then at least cover it with paint.

The LOWEST temp here in North Texas this past winter was around 10 degrees for just a few days and that is what split the PEX. We had 2 Tiffin motorhomes come in this past week and both had the SAME Pex split. It was a 3 inch section (Cold) that connects the feed Pex to a copper manifold split that the other cold water pex lines feed off. The REST of the Pex did not freeze and split, even in the water bay. The customers did not blow their units out and this pipe was vertical under a rear lavy area sink which allowed the residual water to stay in the line and expand. Doug

I'm starting to think there are different grades of PEX. When I crimp a ring on house type PEX I need to squeeze pretty hard with both hands. When I squeezed one on the RV line this winter I thought I goofed since it squeezed so easy I thought my crimper didn't grip. Thinking RV's use the cheap stuff which might not take a freeze as well as the S&B stuff.