Concrete – Will heavy rain tomorrow be a problem if I pour concrete today


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?

Best Answer

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.