Patching

The following technique applies for the majority of the problems described in this section including potholes. The only difference for potholes is that instead of cutting the edges, you need them cleaned up vertically to remove all loose material from the edge. If your parking lot's problems are of sufficient magnitude and appearance is valued, you should consider having a new pavement surface laid over the repaired pavement areas. Drainage performance will be superior on a new, smooth overlay.

When the areas needing repair total less than 15% of the overall parking lot, spot repair should be your approach. If the entire parking lot suffers from structural under design or significantly poor installation, then you may need to consider replacement of the base and pavement surface. If more than 15% of the pavement area requires repair, you may need to consider replacement of the pavement surface combined with spot repair of the base. For maximum longevity, the edges of the deteriorated pavement areas should be saw cut to ensure the crack left by the patch minimizes water penetration. Once the patch perimeter has been marked and cut, all loose asphalt and debris should be removed down to a solid base. All dust should be swept out and blown out of the hole. Tack oil should be applied and bituminous asphalt material installed in two inch (2") lifts to ensure proper compaction (slightly convex to avoid ponding).Primer- tack material should be applied around the edge of the patch to ensure against moisture intrusion. A roller or compaction plate should be used compacting the edges first then proceeding with proper compaction techniques to correct density.