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Yes, concrete can set in rain, but it’s best if you pour concrete 4 to 8 hours before any rain to ensure it won’t impact its strength and appearance. Exposure to heavy rain during the early stages (the first 48 hours after pouring) can significantly reduce the structural integrity of the concrete. Over time, cracking is more likely due to softer concrete. 

There isn't a winner when comparing expanding foam versus concrete for fence posts. Both have benefits and drawbacks, depending on your budget and priorities. Expanding foam may be a better choice if you want a more eco-friendly solution that cures faster. Concrete is more affordable and durable than expanding foam, yet it is harder to work with and takes longer to cure. 

The standard thickness for a concrete driveway is four inches for an area that holds cars and pickup trucks. Larger vehicles like motor homes, heavier trucks, and trailers should be thicker to accommodate the added weight without cracking. Plan to pour concrete five inches thick for driveways that need to accommodate large, heavy vehicles.

Lally columns do require some kind of footing to ensure they have a strong enough base to provide the support they need to deliver, and, at the very least, they need to attach to the floor below. Some contractors will just use the existing foundation as a footing for temporary Lally columns, while some circumstances demand that the expert install a new footing. You might need a local structural engineer to weigh in on which is best for your project.