Does anyone actually use those infrared thermometers to check the surface? Or is it more just “if your hands are burning through your gloves, time to pack it in”?
I’ve definitely seen crews using infrared thermometers, especially on bigger commercial jobs. It’s not just about comfort—some manufacturers actually specify a max surface temp for warranty purposes. I think GAF says not to weld if the membrane surface is over 120°F, but I’ve watched guys try it anyway when the deck’s pushing 140. Usually doesn’t end well. The glue flashing off too fast is a real headache, and seams can get sketchy if you’re not careful.
From my experience, it’s less about the air temp and more about how hot the membrane itself gets. If you can’t keep your hand on it for a couple seconds, you’re probably fighting a losing battle. I’ve had crews try to shade sections or start super early, but sometimes you just have to call it and wait for things to cool down. Not worth risking bad welds that’ll leak later.
That’s a good point about the warranty—people forget it’s not just about getting the job done, but making sure it’ll actually last. I’ve seen roofs fail inspection just because seams looked fine at first but didn’t hold up after a couple seasons. Ever see issues crop up from folks rushing welds in the heat, or is it mostly just initial adhesion problems?
Ever see issues crop up from folks rushing welds in the heat, or is it mostly just initial adhesion problems?
I've definitely seen both, but the rushed welds in high temps seem to cause more headaches down the line. Had a project last summer where the crew was trying to beat a thunderstorm—seams looked perfect at first, but a year later, we found a couple spots where the membrane just peeled back. Makes me wonder if folks have better luck with night shifts or early mornings to avoid that midday heat? Or is it just about patience and not letting the pressure get to you?
Night shifts sound dreamy until you realize you’re up there with a headlamp and every bug in the county. I’ve tried pushing crews to start at sunrise, but even then, by 10am in July, the roof’s already hot enough to fry an egg (and maybe your patience). I’ve seen those “perfect” welds peel back too—usually right after I bragged about how smooth the job went.
Honestly, I think it’s a mix of both: patience and timing. You can’t always control the weather or the schedule, but rushing in the heat is just asking for callbacks. I’ve had guys try to power through because “the clouds are coming,” and sure enough, a year later I’m up there with a patch kit and a bruised ego.
If you can swing early mornings or split shifts, it helps. But sometimes you just have to accept that the roof’s gonna win a round or two. At least it keeps things interesting...
But sometimes you just have to accept that the roof’s gonna win a round or two.
That’s the truth. I’ve tried to convince folks that “too hot” isn’t just about comfort—it actually messes with the welds. Last July, we hit 98°F by mid-morning and the TPO was so soft it felt like walking on bubble gum. Welds looked fine at first, but a few months later, seams started lifting. Ever tried using a heat gun when the membrane’s already halfway melted? Not fun.
I keep wondering if there’s a sweet spot for timing, or if we’re just at the mercy of summer. Anyone else notice better results on cloudy days, or is that just wishful thinking?