That’s definitely something to take seriously—repeated tunneling under a slab can undermine the base and lead to cracks or sinking if it keeps going.
Here’s how I’d approach it step by step:
🕵️ First: figure out the culprit
Different animals dig differently:
- 🐀 Rats → small holes (5–10 cm), often near edges, very active at night
- 🐇 Rabbits → larger openings, usually visible entrances
- 🦡 Badgers → big, messy digging (less common depending on region)
- 🐍 Snakes → don’t dig, but may use existing tunnels
- 🐜 Ants/termites → lots of small soil piles, not one big tunnel
👉 If it’s “back every morning,” rats or similar burrowing rodents are the most likely
🧱 Immediate protection (important)
To protect your shed foundation:
- Fill the hole with:
- gravel or crushed stone (not just soil)
- then top with soil
- If possible, add:
- wire mesh (hardware cloth) under the area before refilling
- this stops re-digging
👉 Soil alone is easy for animals to reopen—that’s why it keeps coming back
🚫 Stop the animal (otherwise it won’t end)
You need to deal with the source:
Option 1: Traps
- Snap traps or live traps placed near the entrance
- Best for rodents
Option 2: Block access properly
- Dig a shallow trench around the slab edge
- Install metal mesh vertically (L-shaped barrier)
Option 3: Remove attractants
- Food scraps, pet food, compost nearby
- Dense vegetation or hiding spots
⚠️ What NOT to do
- ❌ Don’t just keep refilling with loose soil
- ❌ Don’t pour chemicals or fuel (dangerous + ineffective)
- ❌ Don’t ignore it—it can worsen structural damage
🚨 When to escalate
Call pest control if:
- tunnels are large or expanding fast
- you see multiple entrances
- you hear movement under the slab
🧠 Bottom line
- The animal will keep digging unless stopped
- Reinforce with gravel + wire mesh, not just dirt
- Combine physical barrier + pest control for a real fix
If you want, you can describe:
- size of the hole
- location (edge vs middle of slab)
and I can help you identify exactly what animal it is.
