If I start pouring concrete today at 2PM while it's sunny, and it starts to rain heavily tomorrow at 2PM... and not stop raining for the next 5 days (this is the weather forecast), will my driveway be fine?

Is 20+ hours enough time for the concrete to harden and not get "dug up" by heavy rain?

2 Answers 2


No, it isn't a problem if...

  1. You lay poly sheeting or a tarp over it after several hours of cure time (ideally the following morning). Driving rain could degrade the surface of the slab, which is still soft even after a day.

  2. Water running along the slab won't undermine its base.


As long as your concrete sets up normally, it should be fine if it rains 20+ hours later. I've done it several times with no problems. It would only be a problem if there is something stopping it from setting up, like freezing weather.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.