3" of slope should do it in a perfect world. But if you have any low spots, they will be a problem. I sloped a 12' slab just 1" once and I had a puddle about 1/8" deep in the middle. I may have "floated" that low spot in, I don't know. Anyway, go 3" as a minimum and more is better.
thats exactly what i went 3 inches, the owner wanted 2 inches but we convinced him to go 3 inches , the building is actully 37 * 75 and a drain that is 35 feet long is in the center . The reason he didnt want much slope on it was because of the creapers that the mechanics use on the floor, we told him there will probably be low spots in the floor and he said that is what they make squeegies for , to get rid of the water . Now that concrete is hard and the low spots appear , he got a problem is there a percentage a fellow should use for future sloped floors for garages?
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