Slope In A Garage Floor

Garage floor slope question hello this is a very dump question.
Slope in a garage floor. Aci 117 90 st andard specifications for tolerances for concrete construction and materials gives a level alignment tolerance of 3 4 inch for top of slab elevation of slabs on grade. First the floor may be so out of level that the garage floor does not meet the bottom edge of the door. At a very rare occasion i measured the slope on both sides of the garage. One side is about 4 5 and the other side is around 5 4.
Second and far more critical is when the garage floor has begun to tilt backward toward the house. So i did more measurement in the garage. And i was wondering if there s some way to slope the garage floor without completely rebuilding the garage. The building code requires that a garage floor be sloped towards the door but does not specify a minimum slope.
They may have made it 1 4 per foot just to. Concrete floor oodles of empty space and a floor that turns out to not be level. The floor may appear flat until you. Typical slope of 1 to 2 degrees towards driveway.
We have an attached two car garage with the size of about 21 x 21. However an out of kilter garage floor may require leveling when two critical scenarios happen. Garage floors unlike floors inside your home are sloped to promote drainage. In the winter the runoff from whatever snow is on it just pools on the floor in the garage.
This is no accident. It is usually 1 8 to 1 4 per foot. In most cases the angle of the slope is gentle enough to be barely perceptible. Here is the citation from the international residential code irc.
A 2 slope will probably ensure better drainage we could also find no slope tolerance for use when a floor slope is specified.