Kid on my crew said he'd rather pour in July heat than finish in the cold, that got me going
We were sitting in the truck after a pour off Route 9 in Fredericksburg waiting on the mud to set, and this 22 year old kid on my crew said he'd take a 95 degree day over a 35 degree morning any time. I laughed at first but then he explained how cold weather makes him rush the float work because his hands go numb and the cream sets up weird on him. Then I thought about last December when we did that 4000 sq ft slab in the wind and it looked like garbage by lunch. Honestly I think the sweats and the slow cure in summer are easier to deal with than fighting the set time in winter. What's your cutoff temp where you just tell the GC we're not pouring today?
I'm the opposite on this one. Give me a 35 degree morning every time, because once you're moving and pulling a screed you warm up quick, and the mud gives you way more open time before it kicks. Last July we poured 80 yards on a Walmart pad in 98 degree heat with the sun beating down, and I had two guys puking by 11 and the mix went stiff on us before we even got the power trowel out. Heat like that isn't just rough on the guys, it flat out works against you. Where I draw the line is below 30 with wind, that's when I tell the GC we're waiting.