Originally Posted by
jfsully
No, because you will stand perpendicular to the earth, not to the platform. If your slope is left-to-right, different story, but front-to-back means you will automatically accommodate by leaning forward. You could also shim your heels, and have garage-lifting shoes. This would be less messy and irreversible than pouring leveling concrete.
My garage slopes 1.5” over 8 feet. You wouldn’t need much of a shim to compensate for the slope over the distance of your foot. In fact you probably wouldn’t notice it if you did nothing, except for the bar rolling into your shins when you deadlift.