Pavers sit on a base that's easy to hollow out
A paver patio or walkway isn't a solid slab — it's individual pavers set on a compacted base of crushed rock and sand, with fine sand swept into the joints to lock them together. That layered, granular base is what makes pavers vulnerable to burrowing. When an iguana tunnels underneath, usually starting from a bed, an edge, or a joint, it hollows out that base and the pavers above lose their support.
Once the support is gone, the pavers sink, tilt, and spread apart, and the joint sand washes down into the void, loosening the whole field further. It's a quieter version of the slab-undermining problem, but the granular base often fails faster than solid concrete would.
What you'll see
- Individual pavers dropped below their neighbors or rocking underfoot
- Widening joints where the locking sand has washed away
- A low, dished area over a hollowed base
- A burrow opening at the patio's edge, bed, or adjacent soft ground
It looks like ordinary settling
The frustrating part is that iguana-driven paver failure looks a lot like normal settling, so owners often re-level the pavers without realizing a burrow is the cause. Because the base washes out progressively as long as the tunnel stays open, the affected patch tends to keep growing and the re-leveling doesn't hold.
Fix the cause, then rebuild the base
Re-leveling helps only if the burrow is closed and the animals removed first. Otherwise the iguanas simply re-dig, the base washes out again, and you're relifting the same pavers next season. The durable sequence is to remove the resident animals, collapse and compact the burrow, then reset the base and re-lay the pavers so the repair actually holds.
Common questions
Why are my patio pavers sinking and separating?
If an iguana has burrowed underneath, it hollows out the sand-and-rock base so the pavers lose support and sink, tilt, and spread as the joint sand washes into the void. It looks like ordinary settling but is driven by the burrow.
Can I just re-level the pavers?
Re-leveling helps only if the burrow is closed and the animals removed first. Otherwise they re-dig, the base washes out again, and you're relifting the same pavers next season, so address the iguanas before rebuilding the base.
How is this different from a concrete slab?
A paver field sits on a granular sand-and-rock base rather than a solid pour, so a burrow can wash that base out and loosen the joints faster than it would undermine a concrete slab — but the underlying cause and the fix are the same.
