How to Fix a Cracked Paving Slab
Quick Answer
Remove the cracked slab, prepare the base, lay a new slab, and fill the joints with sand.
How to troubleshoot a Cracked Paving Slab
A cracked paving slab is a trip hazard. This guide covers replacing the slab or filling the crack with a repair compound.
Step-by-Step Fix
- Lift the cracked paving slab using a pry bar and remove it carefully.
- Excavate the area to a depth of 4-6 inches and add a layer of compacted sand or gravel.
- Level the base and lay the new paving slab, ensuring it is flush with the surrounding slabs.
- Fill the joints with fine sand or polymeric sand to lock the slabs in place.
- Wet the sand to settle it and repeat until the joints are completely full.
Common Error Codes
| Code | Meaning | Resolution |
|---|---|---|
| New slab is uneven | Base not compacted | Lift the slab, recompact the base, and re-lay. |
| Slab cracks again | Insufficient base thickness | Increase the base depth to 6 inches. |
Frequently Asked Questions
Can I repair a crack instead of replacing the slab?
Yes, for hairline cracks, use a concrete repair compound.
What is polymeric sand?
A sand that hardens when wet, preventing weeds and ants.