Masonry Magazine February 2002 Page. 33
OTHER STAINS
There are a number of other stains, which may show up on the face of wall systems. These technically may not be efflorescence, but are a concern to owners.
White scum is generally the residue of the cleaning process caused by lack of water during the cleaning process. The cleaner evaporated before the mortar residue is washed away. A similar reaction would occur if the brick is not saturated prior to cleaning and the cleaning solvent is absorbed into the wall. Neither of these is considered efflorescence.
Proprietary cleaners can remove other stains such as vanadium, manganese and lime run, but much investigation is required to match cleaner to stain.
CAUTION: Try tests to determine best solution and do not jump to fixes, which could be worse than the original complaint.
Edgar F. Glock, Jr. AlA/CSI is the Executive Director of the Masonry Institute St. Louis. Misl@sbcglobal.net. Registered Architect in Missouri and Illinois, Certificate of Building Design: a Certificate of Architectural Technology, Bachelor of Technology/Architecture, Washington University, St. Louis, MO. During the 30 years he has been involved in the architectural field, construction administration and building and material evaluation have been his major interests. After a tenure with several St. Louis architectural firms he became an independent specification consultant for approximately 15 years, and at the time of his appointment as Executive Director of MISL, he was the project architect and construction manager for renovation projects at a St. Louis Hospital: Past President of the Greater St. Louis Chapter CSt Member AIA-CPC-CSI Continuing Education Committee; Member AJA-BOCA ICC Professional chapter; Past Zone 3 Professional Director The Masonry Society; Member of Masonry Standards Joint Committee; Member of several code and standards committees.
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MASONRY FEBRUARY, 2002 33