Good insurance to have that large roll of poly enough to cover that driveway, real good insurance, if you can't stop the pour today.
Contractors liability, your talking an expensive material here, what does you contract read ? If you give the go ahead and the contractor documents your directive to proceed, you own it if it rains and it's not set enough to withstand the damage. Contractor will always try to transfer risk, and justifiably so.
11:00 a.m. at this time of year ??? A large pour should start no later than 7:00 A.M. heck I'd want it at 5:30 a.m. if I could get it without paying O.T. at the plant or for the drivers. Your weather forecast should have reinforced that, you may very well have green areas that will sustain finish damage by this heavy rain, hail and all that, I'd be the first one to tell you to call it off, t-storms are too violent, too much rain at once. After it's set up, if you use what is done on bridge decks for example, they use sprinkler hose and burlap to cover it, to obtain a slow cure, not allowing the concrete to hydrate (cure) too quickly, especially in hot weather conditions. A nice soaking slow rain would duplicate this, thunderstorm could wash the finish right off and expose aggregate if it's too green because they got a late start, always pour as early as you can on something like this. Even with poly covering it, the weight and impact of the water can have an effect. The concrete has to be of correct mix design as it's placed, finishers need to screed and finish it off in time to get the right finish on top, no time to waste there, any variances here and you don't get the benefit of the doubt there, + heavy rains you may not be happy. Lot of variables in concrete work, every pour and batch is a little different.
Don't mean to sound harsh, but I'd want an early pour with enough time for it to cure before rain, in the next few days, sprinkle and soak it all you want to keep it from drying out to quickly, but right after it's set, heavy rains, hail and all the rest that goes with thunderstorms, not happening on my job that is for sure.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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