What is the recommended slope of an asphalt parking lot? 1% 30% 2% 60% Not sure 10% Get Free Quotes Today! Question: What is the recommended slope of an asphalt parking lot? Top Answer (60% of 10 votes): 2%. Answer: 1% Explanation: You want your water to run to your catch basins and HAMMER & SONS CONSTRUCTION Get Free Quotes Today! Find Local Pros Free Parking Lot Asphalt Paving Cost Estimates Related Questions How Much Does Commercial Parking Lot Paving Cost? How Much Does Parking Lot Resurfacing Cost? Poor soil conditions will increase the cost of asphalt parking lot paving. Top answer: True How Often Should an Asphalt Parking Lot Be Sealed?Top answer: Every 2 years How long should you wait before driving cars on a new asphalt parking lot?Top answer: 1 day