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A warning from a guy at a supply yard in Phoenix that saved my hide
I was picking up a load of quick-set mix for a small patio job, maybe 5 years back. This old timer, Leo, who ran the yard, saw me loading the bags and just shook his head. He came over, put a hand on my truck, and said, 'You check the forecast for tonight?' I hadn't. He pointed at the sky and told me, 'They're calling for a 40 degree drop after sunset. You lay that down now, the top will skin over and the core heat will blow the surface to pieces by morning. Seen it ruin a $3,000 slab.' I waited a day, and he was dead right. That quick chat in the dust of his yard changed how I plan every pour now. Anyone else have a simple tip from an old hand that stopped a big mistake?
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margaret_white487mo ago
That line about the core heat blowing the surface to pieces is so real. My buddy had a similar thing happen with a fence post concrete job. Some guy at the hardware store saw him buying bags and asked if he was doing it that day. Told him the ground was still frozen a few inches down from a cold snap, and the concrete wouldn't set right, it would just crumble in a month. My friend blew him off and did it anyway. Sure enough, spring came and half those posts were loose. He had to redo the whole thing.
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victorb747mo ago
Yeah that "ground was still frozen" part is key. I learned the hard way too, tried to set a mailbox post in late winter. Now I just wait for a solid thaw and use a cheap soil thermometer to check a few inches down. If it's above 40, you're usually good. Saves so much hassle and wasted concrete.
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kelly.nora6mo ago
Honestly, I have to wonder if some of this gets overblown. A 40 degree drop is a lot, but how often does that really happen exactly when you're pouring? And sure, frozen ground is bad, but a lot of guys work through the winter with no issues if they prep right. Sometimes it feels like these old yard stories are more about luck than hard rules.
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