Are ppr pipes not worth the money?
I'd insulate the pipes and move on
PPR, like PEX and unlike PVC, is a freeze-tolerant material; however, that doesn't mean that pipes made from it should be allowed to freeze on a routine basis.  I would start by adding pipe insulation (foam pipe insulation is available as prefab, &quot;peel and stick&quot; pieces) provided these are not irrigation pipes, which should be drained/blown out for the winter season anyway.  I am baffled as to how you wound up with plumbing runs on the outside of your house, though...