
Concrete Flatness: A Nickel Ain’t Worth a Dime Anymore
Strange as it sounds now, back in the 1970s, getting a concrete floor into a “flat mode” was at times measured as “no more than an 1/8 inch difference in 10 feet,” or for the old timers, “throw a nickel on a wet floor, and if the water doesn’t bead over the top, it’s okay.” …