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how hot is too hot when welding TPO roofing?

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(@kayaker81)
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Totally agree—going by smell or bubbling is just asking for trouble with TPO. I’ve seen guys torch a seam and not realize it’s cooked until the next rain. Temp probes are a must, but even then, surface temps can jump all over the place if you’re working in direct sun or there’s a breeze. Ever tried using a scrap piece to dial in your settings before hitting the actual seam? It’s saved me more than once when conditions kept shifting.


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