That’s a real problem—something persistent is burrowing, and under a slab it can eventually cause settling or cracks if ignored.
Let’s handle it step by step.
🕳️ What’s likely digging the tunnel
Common culprits (depending on size of the hole):
🐀 Rats
- Small–medium holes (5–10 cm)
- Often near structures
- Active at night
🐇 Rabbits
- Larger, round holes
- Usually in soil near edges
- Often multiple entrances
🦔 Hedgehogs (less destructive)
- Smaller burrows
- Usually not deep under concrete
🦡 Badgers (if in your region)
- Large tunnels
- Very strong diggers
🐜 or termites (less likely for big tunnels)
- Cause damage but don’t make large visible tunnels like that
🔍 How to identify it
Check:
- Hole size
- Fresh soil pile shape
- Time it appears (morning = night activity)
- Any tracks or droppings nearby
🧱 Why this is serious
- Soil removal = void under slab
- Slab can sink or crack over time
- Water can enter and worsen erosion
🛠️ What I would do (practical plan)
1. 🚫 Stop the animal first
Otherwise it will keep digging.
Options:
- Live traps (for rats/rabbits)
- Professional pest control (best for persistent cases)
- Block access points around shed edges
2. 🧱 Reinforce the hole properly
Just filling soil won’t work.
Do this instead:
- Fill with gravel or crushed stone
- Add coarse sand
- Compact firmly
👉 Animals hate digging through gravel
3. 🧰 Add a barrier
- Install wire mesh (hardware cloth) around the base
- Extend 20–30 cm underground outward
👉 Stops re-entry
4. 💧 Fix moisture issues
- Check for water leaks or soft soil
- Improve drainage if needed
👉 Soft ground attracts burrowing animals
⚠️ What NOT to do
- ❌ Don’t keep refilling with loose soil (they’ll reopen it)
- ❌ Don’t ignore it (foundation risk increases)
- ❌ Avoid poisons unless necessary (can create smell/secondary issues)
🚨 When to call a professional
- Tunnel keeps returning daily
- Large or expanding void
- You suspect rats or something bigger
- Slab already showing cracks
💡 Simple takeaway
👉 Stop the animal first
👉 Then fill with gravel + barrier, not loose soil
👉 Protect the foundation early before damage spreads
If you want, tell me:
- hole size
- country/region
- any photos
…and I can identify the exact animal and give a more targeted fix 👍
