I've used rubberized underlayment a few times, mostly on roofing jobs rather than basements. Curious how it holds up long-term in basement application...

Glad it worked out for you, but honestly, sometimes even thorough documentation doesn't cut it. Had a similar issue once, and the insurer still wouldn...

Honestly, ambient temp might be less critical than surface temp. I've welded TPO on hot days without issues by shading the membrane beforehand... mayb...