Step 5 - Vibrate Mortar

The vibrating roller is pushed over the area that has been grouted. A minimum of 3 passes with the vibrating roller is advised.

When the mortar is vibrated into the joints, it extends into the top layer of the porous laying course, and under the edge of the stone elements. This produces a profile shape under each joint rather like a rivet head that has been extruded - or an inverted T beam.
This provides a strong join between the mortar layer and the porous laying course and allows the layers to act as one.

Excess air and water is vibrated out of the mortar material.