Correct treatment of efflorescence

Simple & safe to the goal

1. Check the underlay render, if load-bearing.
2. Sweep off the masonry, if necessary, with a hard broom. Apply a lightweight fiber-reinforced underlay render, for ex. weber.dur 137.

Lightweight lime-cement render

Lightweight lime-cement render

Lightweight lime-cement fiber-reinforced render

Very lightweight lime-cement and fiber-reinforced render