Thoughts on pouring foundation in the rain?

gobrunoOctober 5, 2009

I was wondering if anybody poured their foundation while it was raining or while there was intermittent rain. Is it ok? We're looking at possibly pouring when it's not raining, but rain is schedule for the 2 days following the pour. I've read some articles that say that it's a good thing bc it helps the concrete to cure, and others say that it's not good. Any thoughts or experience with this would be greatly appreciated!


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A gentle, consistent mist-rain is a wonderful thing to happen AFTER the pour.

The sky's water is difficult to measure and would affect the overall consistency, which means the finished quality would be affected, especially if the mix has additives. (see link for one discussion on the subject)

I can't think of any concrete company that would attempt a pour during the rain, although I know of at least one guy who drove up and sat with the mixer churning, waiting for the "intermittent" during a week of rain. OTOH, a small pour would be possible if the area was under cover, such as having a tarp tented over that covers both the form and the dispensing tube.

Here is a link that might be useful: pouring concrete during rain

    Bookmark   October 5, 2009 at 3:03PM
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As long as you don't try to pour concrete in the rain, you'll be fine. Concrete sets up fairly quickly, but, if there is a chance off a downpour in the couple of hours before it sets up, you should be able to protect it with a roll of visqueen. After the initial pour it's good to have the concrete wet. In fact, whenever I have poured slabs, and had the time, I have flooded them with water on a daily basis and kept them covered with visqueen to help them cure for a couple of weeks.

    Bookmark   October 5, 2009 at 5:11PM
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What do you mean by 'foundation'?

Are you talking about a footing?

A slab on grade?

Formed concrete foundation walls?


Something else?

Your answer will determine whether or not one should or could pour the 'foundation' in the rain...

    Bookmark   October 5, 2009 at 7:56PM
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Here in the mojave, in the summer months, we would berm up the perimeter of the slab the day after the pour and let a rain bird run for about a week or so. The slab would have a measurable amount of water being held by the berms. This allowed the crete to cure slowly, not too fast from the heat. We would then wait at least a week before framing on it after removal of the rain bird. Rain would always have been welcome, but kinda rare here in the desert, especially in the summer months. The purpose of keeping it wet is to slow the curing process, although concrete is always a curin', relativly speaking. Some concreter's would simply just fire up the rain bird without berming which i'm sure was effective as well.

If it's not all that warm where you are pouring and you are getting close to freezing temps at night, I wouldn't be too concerned keeping the slab all that wet, definetely not flooded.

    Bookmark   October 5, 2009 at 7:59PM
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