what causes efflorescence in brickwork
Efflorescence is a powdery deposit of salts which forms on the surface of bricks and mortar. It is usually white but efflorescence may be yellow, green or brown.ater allowed to enter uncovered cavity walls during construction is likely to cause efflorescence so brickwork must be protected from water entry during construction. Persistent efflorescence should be taken as a warning that water is entering the wall through faulty copings, flashings, or pipe leakage.