The driveway at my home has settled and cracked near the garage, and has been undermined which causes siltation at the bottom of the driveway following any measurable rain. It's about a 12% slope. I'm getting estimates for both mudjacking and also full tearout and replacement. I intend to be in this house for awhile, so I'm leaning toward replacement as a long-term fix. The contractors have said 4 inches of concrete is standard for residential driveways, placed on a 6 inch crushed rock bed to help eliminate the undermining and siltation problem I have now. But other folks, including my dad, suggest 6 inches of concrete.
Is 6 inches worth the extra money?