My friend Hersh was back today to frame the basement. I missed his smiley face in the morning. He must have known I'd have the temporary heat running. Plumbing on the first floor ceiling continued. We're using a "super" PEX that has a wider diameter tube, but most importantly plastic fittings. Some of the PEX systems installed in the last decade or so are showing rust where the crimp fittings were touching the tube... some were even failing.