How Poor Sub-Grade Prep Causes Problems When We Pour Concrete Floors

#EverythingAboutConcrete #MikeDayConcrete
We're hired to pour and finish the concrete floor. The concrete is supposed to be 4 inches thick and match the top of the concrete wall on the walk-out side of the foundation. The sub-grade gravel should be 6 inches down from the top of the concrete wall. Then 2 inches of styrofoam will be installed over the subgrade leaving us a 4" concrete floor to pour. How hard is that to figure out and grade the gravel correctly?
I guess it's pretty hard because this subgrade was terrible. I had already made a trip up here to check the subgrade. It wasn't ready the day I showed up so I talked with the people here and they assured me it would be done right. I didn't make a 2nd trip to check it because I thought they'd get it pretty close to 4" thick. Well, I was wrong. It's hard to believe, for me anyway, that someone can grade a floor and not use a laser to check the level of the gravel they're installing. Don't just grade it and guess it's good. Watch the video and see what happens when I take someone else for their word. I even ordered 2 cubic yards extra, just in case, and it still isn't enough to make up for the terrible sub-grading.

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