2 ms·

I've noticed that Pex has taken over new construction in my area. I built my house 17 years ago and copper water pipes were still standard. I just assumed cost

by mark-r 9y ago

I've noticed that Pex has taken over new construction in my area. I built my house 17 years ago and copper water pipes were still standard. I just assumed cost was the big driver since copper has gone up about 200% in that time. You say that copper will eventually corrode, but how does that compare to the lifetime of Pex?

bluGill 9y ago
Good question... Regular polyethylene is rated for 50 years in ground (I was researching geothermo at one point), and experts say that is mostly because nobody wants to bother with caring about things that will happen after they are dead. Generally it is believed we should get 200 years out of it, perhaps more. PEX has essentially zero resistance to UV, in sun exposure salutations you get a few weeks of lifetime. Most buildings don't expose plumbing to sunlight though. There are a few (very few) chemicals that attack PEXs, but all the ones I know of are nasty enough that I'd wear full protection if I ever have to work with them - not something I expect drinking water will ever contains. Pex is resistant to any PH I'd want to drink.