how hot is too hot when welding TPO roofing?

Reflective tarps can indeed bounce heat back, but if they're positioned properly - angled slightly or set higher up - they might actually deflect some heat away without cooking you underneath. I've noticed surface color makes a noticeable difference too; lighter TPO surfaces definitely feel cooler to the touch than darker ones. Haven't measured exact temp differences, but on hot days, the lighter shades seem easier to manage welding-wise. Worth considering...

- Good points on tarp positioning - angle definitely matters.
- Lighter TPO surfaces do seem easier to handle; noticed the same thing myself.
- Haven't measured exact temps either, but my IR thermometer shows lighter colors run noticeably cooler midday.
- Small temp differences can really help welding consistency, especially if you're DIYing on a tight budget.
- Appreciate the insights, makes me feel better about my setup choices...

Good insights overall, but honestly, I've found that even darker TPO isn't too tricky if you adjust your welding speed and airflow carefully. Color matters, sure, but technique tweaks can offset temp differences quite a bit...just takes practice.

Interesting point about tweaking airflow and speed...makes sense. I've seen roofers struggle more on white TPO sometimes, weirdly enough. Wonder if ambient temps or humidity levels play a bigger role than we realize? Had a roofer once tell me cloudy days actually made welding easier - less glare and more consistent surface temps. Ever noticed anything similar with weather conditions affecting your welds?

"Had a roofer once tell me cloudy days actually made welding easier - less glare and more consistent surface temps."

Interesting observation, hadn't thought about the glare factor before. From my experience, ambient temperature definitely affects weld quality, but humidity seems less impactful. I've noticed welds on scorching sunny days can be trickier because the TPO heats unevenly, causing inconsistent seams. Cloud cover might provide more stable conditions overall...though I'd still be cautious attributing too much to weather alone without considering equipment calibration and technique.