Specialized calculator for commercial parking lot paving projects
0 tons of crushed stone
Approx. 0 standard spaces
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Parking lot asphalt design requires careful planning to ensure durability, proper drainage, and compliance with local codes. Commercial parking lots experience different traffic patterns and loads compared to residential driveways, requiring specialized asphalt applications.
| Traffic Level | Recommended Thickness | Base Layer | Expected Lifespan |
|---|---|---|---|
| Light (Cars Only) | 2.5-3 inches (65-75mm) | 4-6 inches crushed stone | 10-15 years |
| Medium (Cars & Light Trucks) | 3-4 inches (75-100mm) | 6-8 inches crushed stone | 15-20 years |
| Heavy (Trucks & Commercial) | 4-6 inches (100-150mm) | 8-12 inches crushed stone | 20-25 years |
Proper slope of 1-2% is essential for water runoff. Consider installing drainage systems in low areas and using permeable asphalt in environmentally sensitive areas.
Accessible spaces must be at least 96 inches wide with adjacent access aisles. For lots with over 25 spaces, at least 2% must be ADA-compliant.
Standard parking spaces are 9ft x 18ft. Allow at least 24ft for driving lanes between rows of spaces. Use high-quality traffic paint that withstands weather and traffic.
Apply sealcoat 6-12 months after installation, then every 2-3 years. This protects the asphalt from UV rays, water penetration, and chemical spills.
For commercial parking lots, the recommended asphalt thickness depends on the expected traffic: 2.5-3 inches for light traffic (cars only), 3-4 inches for medium traffic (cars and light trucks), and 4-6 inches for heavy traffic (including delivery trucks and commercial vehicles). These thicknesses should be applied over a properly prepared base layer of 6-12 inches of compacted crushed stone.
To estimate the number of parking spaces, divide your usable parking area (total area minus drive lanes, islands, and unusable corners) by the square footage of a standard parking space (162 sq. ft. for a 9ft x 18ft space). For a more precise calculation, consult with a civil engineer or parking lot designer who can maximize your space efficiency while meeting local code requirements.
ADA requirements specify that for lots with 1-25 spaces, you need at least one accessible space. For 26-50 spaces, you need at least two. For 51-75 spaces, you need at least three, and so on. At least one in every six accessible spaces must be van-accessible with an 8-foot access aisle. Always verify current requirements with local building code officials, as they may have additional specifications.
Commercial parking lot installation typically costs between $2.50 and $7.00 per square foot, depending on several factors including asphalt thickness, base preparation requirements, drainage solutions, geographic location, and current material prices. Complete parking lot projects including curbing, striping, and signage can range from $3.50 to $10.00 per square foot for a turnkey solution.
Both hot mix and warm mix asphalt can work well for parking lots. Hot mix asphalt (HMA) offers excellent durability and is the traditional choice, but warm mix asphalt (WMA) provides environmental benefits with 20-35% less emissions and can be installed in slightly cooler temperatures, extending the paving season. For most commercial parking lots, either option works well, but warm mix may be preferred for environmentally conscious projects.