Something keeps tunneling under the concrete slab of my garden shed. I’ve filled it in, but every morning it’s back—and I’m worried it could damage the foundation. What would you do?

3. Check for Structural Issues

A single entrance hole may lead to a much larger underground network. Some burrow systems can stretch from 8 to 66 feet long and reach depths of up to 5 feet. This type of digging can weaken the soil supporting the concrete slab. Inspect your shed for warning signs such as doors that no longer close properly, noticeable tilting, or gaps forming between the slab and the structure. Catching these problems early can prevent costly repairs.

4. Use Temporary Barriers

To slow or stop digging while planning a permanent solution, place heavy rocks or paving stones over the opening. You can also cover the hole with wire mesh (hardware cloth) buried about 12 inches deep and extending outward. These measures may discourage further digging for the time being.

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