Case 2

Introduction

Type of Building: Residential

This case shows a general white or gray discoloration on the face of brick masonry. These may be silicate deposits, sometimes called “scumming”. It is sometimes mistaken for efflorescence, but technically is silicic acid scum.

This type of efflorescence is a harmless and temporary. Even where it does return in cycles following wetter weather, unless there is a supply of salts from another source, the deposits will gradually reduce in intensity until it disappears altogether.

In new work, the extent is often related to the amount of rainwater that enters the structure during the construction process. Post construction efflorescence will always occur where percolating water affects the materials. Salts will be taken into solution and deposited on the edge of the damp-affected area.