I have read the prior posts regarding the pros and cons of using CPVC/PVC and copper and am still undecided. I have a 70 year old house with original plumbing. (That is except for the supply lines that are accessible in the basement. Those have been changed to copper but the year is unknown so there may be lead in the solder.) I want to begin replacing it but here is the catch: I have plaster over thin wallboard that I really want to avoid cutting and repairing. I can avoid much of this cutting/repairing if I use CPVC/PVC. I can also avoid sweating some connections in rather tight places by going with CPVC/PVC. I want to do a quality job (i.e. regardless of when I sell, I want the new system to last as long as possible) but I cringe at cutting open the walls. The hardness of my water 7.6 grains and the pH is 8.1 according to the county water report.
The question is: Are there any potential downsides to using copper in the accessible areas (i.e. the basement and garage) and switching to plastic for the run-ups and branch lines? Also, am I wrong to assume using plastic for the drain lines is OK?
Thanks for any insight one way or the other.
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