How can I cover an old exposed aggregate patio?

An old exposed aggregate patio can be refreshed without removing the existing surface. Rubber tiles made from rubber granules bonded with a polyurethane binder can be laid directly over sound, level exposed aggregate concrete without an additional sub-base. This applies to both in situ exposed aggregate concrete and exposed aggregate patio slabs fully supported by an intact laying course of mortar, sand or grit. The elastic covering can accommodate the granular surface and occasional areas of missing aggregate. Depending on the tile thickness, it can also bridge localised gaps measuring 2 to 3 cm.

The existing surface must be stable. Exposed aggregate slabs on patios, balconies and paths are often laid on sand or grit. If this laying course has been washed away over time, the slabs may be left without full support and begin to rock. Uneven joints and depressions can then develop, making the area unsuitable as a base for rubber tiles.

Where the existing surface is unsuitable, it can be removed and replaced with a stable base. Alternatively, the exposed aggregate slabs can be relaid on a renewed or supplemented laying course to restore a firm, level surface. The rubber tiles raise the finished surface by their thickness, so the available clearance at door thresholds, steps and edging needs to be checked.