Actually a very slight slope like 1 16 will get rid of the water with a little help from a squeegie.
Maximum slope for a garage floor.
As a general rule of thumb most floor to floor height requirements range from 10 to 12 feet.
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.
For a garage with two way traffic there is typically 180 feet of ramp two end bays of 28 feet and two spandrel widths of 1 foot.
It is usually 1 8 to 1 4 per foot.
The apron s length depends on the required slope more length is needed to reduce steep slopes.
Determining the angle of your floor s slope provides a simple method to level work surfaces in the garage.
If the floor is hand screeded and isn t re leveled during the finishing process you may get a few minor birdbaths with the 1 8 ft slope but nothing a quick squeegie won t fix.
The building code requires that a garage floor be sloped towards the door but does not specify a minimum slope.
A 2 slope will probably ensure better drainage we could also find no slope tolerance for use when a floor slope is specified.
Minimums are limited to 8 feet 2 inches for van accessible structures and 7 feet for standard parking entrances.
Of ramp two end bays of48 feet and two spandrel widths of one foot.
The apron extends the width of the garage floor.
Here is the citation from the international residential code irc.
1 attach one end of the string level to the wall of the garage furthest from the main door.