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  Technical Specification


Efflorescence

Efflorescence is the crystallisation of soluble salts on the surface of brickwork (see diagram below) and arises from the evaporation of water carrying soluble salts from the pore structure brickwork i.e. from both the bricks and the mortar joints. This is usually a temporary and harmless phenomenon associated with newly laid brickwork that is drying out. There are certain types (crypto-efflorescence) and severe degrees of efflorescence, however, that may prove harmful. SABS 227/BOS28 The Standard Specification for Burnt Clay Masonry Units defines five degrees of efflorescence:

Nil
No perceptible deposit of salts

Slight
A very thin deposit of salts, just perceptible, or a small amount of salts occurring only on the edges of a masonry unit.

Moderate
A heavier deposit than 'slight,' but that has not caused powdering or flaking of the surface.

Heavy
A thick deposit of salts covering a large area of the unit, but that has not caused powdering or flaking of the surface.

Serious

 A deposit of salts that has caused powdering or flaking of the surface.

Degree of Efflorescence

1
2
3
4
5
Grade
Class of Unit
Number of units that exhibit efflorescence
Degree of efflorescence
Slight
Moderate
Heavy
Special
FBS
FBX
FBA
NFP
NFX
20
20
20
10
10
-
-
-
10
10

-
-
-
-
-
Normal
FBS
FBX
FBA
NFP
NFX
10
10
10
-
-
10
10
10
10
10
-
-
-
10
10


 

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