Repairing Brick Patios: Mortar, Sunken Pavers, and Better Joint Materials

Fixing a Florida Brick Patio Over Concrete

A North Florida homeowner faces two issues: eroded mortar joints after pressure washing, and sunken pavers on a sand-set front path. Landscape architect Sean Murphy provides step-by-step solutions.

Re-grouting Mortar Joints

1. Remove at least ½ inch of old mortar to create a clean bonding surface.
2. Re-grout with fresh mortar (a mix of Portland cement, sand, and lime).
3. For a no-splash, shoe-friendly alternative, consider Permatil—expanded shale gravel that won’t track or wash out.

Repairing Sunken Pavers on Sand Base

There’s no easy fix. The sunken bricks must be removed, old mortar chiseled off, and the base rebuilt:

• Excavate and install a 3–4 inch compacted granite dust/gravel sub-base, or a 3-inch concrete slab.
• Add edge restraints to prevent lateral spread in sandy soil.
• Re-set pavers and re-grout joints.

Proper base preparation is critical—most failures stem from inadequate sub-base.

What Was That “Bagged Stuff”?

The material spread and wetted during the front path installation was likely pre-mixed mortar or Portland cement with sand.

For lasting results, invest in a solid base and quality joint material. DIY repairs are labor-intensive but doable with the right tools.