We would prefer to put in a concrete parking lot rather than asphalt but pnces in our area suggest that we cannot afford it unless we can cut the pavement thickness to 3 1/2 inches. Are concrete pavements this thin permissible for parking lots?
Some engineers now consider concrete pavements only 3 1/2 inches thick to be adequate for parking lots that are to be used only for passenger cars, though as much as 6 or 8 inches may be needed if there is a significant amount of truck traffic. If you still have a question about whether you can afford a pavement thicker than 3 1/2 inches, however, you ought to calculate the life cost of the pavement. Because of low maintenance costs, pavements of greater thicknesses than this are generally less expensive over their lifetimes than asphalt pavements.