Building a house and was a little concerned that the builder poured the icf walls the other day. Weather was cold around 40 and rainy. He said you can pour down to around 20….little concerned about that! All responses appreciated!
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Concrete generates some heat as it cures. Since you're pouring into a shell of insulation, some of that heat will be retained. I think there's a good chance you're OK.
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Won't be a problem. Damp weather is actually good because it keep the water in the concrete where it can cure. If you were pouring a slab you'd want foggy, drizzly weather for a week after the finishing was complete. Since the concrete is in forms, though, it probably make no difference if the weather is humid or dry. Concrete does generate heat as it cures and the insulation provided by ICF's is very good. You'll get all the strength you need even with the weather in the 30's and 40's.
When we started our house last year, we decided on ICF. We were, like you, concerned with temps; our builder was an "early adopter" of ICF systems, and had lots of experience to reassure us. He told us that for his first few pours, the local inspector and the ready mix guy were quite concerned. So they put thermocouples in one pour. Every foot, from top to bottom on an 8 ft wall.
They poured the wall; covered the exposed top with a layer of loose foam board. Overnight, he said the temp went down to -20 C. After 2 days, the concrete temp had dropped to 5 C; but since the only problem was freezing in the first 24-48 hrs, everyone was happy. Since then, no one worries about ICFs; if it's below -20, it's hard to get the guys to work, much less pour a foundation.