Section R309.6 is hereby added to the International Residential Code for One- and Two-Family Dwellings and shall read as follows:

R309.6 Residential driveways. Residential concrete and asphalt driveway slabs shall be a minimum of four inches nominal thickness. The driveway shall have a constant slope so as to avoid ponding of water. The slope shall be away from the house or building or drain by means approved by the building official.