What's the rule for pouring concrete when there is a chance of rain?

Can it be covered with tarp?

quote:

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Don't

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This x infinity

There isn't a "rule".... But

Watch the weather radar
If it looks like it is goig to rain in the next 2 hrs prior to starting to pour, I wouldn't.
But make them have some clear tarp on site prior to beginning Friday...

a few things about concrete and rain:

- Water actually helps concrete cure better in the long run.
- If the concrete hasn't began it's set (generating its own heat), rain can hurt the surface by over saturating the cement and will weaken the top grout. This will lead to "shrinkage cracks" about 99% of the time. These are small, 1/16th of an inch wide" cracks that are ugly.
- Rain happens. You can cover it with plastic and let it set a bit and then finish it after with no worries.

DO NOT haha

as above once it starts to cure you want it to stay wet...a normal rain is the best thing for it. Prior to cure you want to cover it with visqueen

You're not supposed to pour concrete in rain. It reduces the compressive strength of the concrete and if it doesn't meet minimum PSI requirements, the concrete might not hold up and you'll be forced to take it out and do it over again which is an enormous pain in the arse. Just do it on a dry day.

Slip form or pump truck?

Pour it, level it off, cover it til it starts making heat,uncover and finish