Driveways are often one of the first things people notice when they pull up to a house. They are also one of the most used areas of any property, from driving home and parking, shovelling snow, working around the house, or being concerned about water drainage.
Driveway settling can be caused by a few different factors, but it's usually one of two main reasons. The first is often due to the backfilling around a house. When houses are built, they require backfilling around the foundation. If this is rushed by the contractor or the material goes in too wet or dry, adequate compaction generally is not able to be achieved. It isn’t until a little while after driveways are poured that the settling in the subgrade would occur. After so long of there being no support under a concrete slab or weather and weight have played a factor in it, a driveway can begin to drop and crack.
The second reason is similar to the first, except it is usually because utilities run into the house beneath the driveway. Like the backfilling around a house foundation, if the backfilling above utilities are not completed correctly, the sub-grease can begin to drop over time, allowing for the concrete to drop and crack also. The biggest risk from all this is that any settling in the soil can become a low point for water to pool or run to. If there’s one thing to keep a house foundation structurally sound, it is ensuring that water is not running under it anywhere if at all possible.
Of course, there can be other factors that cause settling in concrete, but those are generally the main ones. Cracks can often lead to unsightly or tripping hazards. To maintain a higher curb appeal, whether it be to sell a home or just making sure your driveway stays smooth, filling voids or lifting services with polyurethane is ofter a great cost-effective solution.