alkaline environment for cavity wall ties, has been used since the Second World War. Alkaline environment is beneficial for ties protecting from acid and procrastinating the corrosion process. Before cement-based mortar, lime-based one was used, which does not present an alkaline environment. Therefore, the majority buildings with wall tie corrosion are built before the Second World War. An alkaline degree gets weaker while exposed at acidic rain over the time. Moreover, metal corrosion is a chemical reaction that the reaction rate is triggered by water and heat. Thus, some say that cavity wall insulation enhance the ability to grab water longer, so that the environment of the ties damper. Accordingly, the South or South West elevations warmed by the sunlight are warmer, letting ties more at risk for this type of corrosion. See also Anchor plate Cavity wall External links Holland, Malcolm. Practical Guide to Diagnosing Structural Movement In Buildings. Hoboken: Wiley, 2012. Whittemore, Herbert L. Structural Properties of a Brick Cavity-Wall Construction Sponsored by the Brick Manufacturers Association of New York, Inc.. Washington, D.C.: U.S. Dept. of Commerce, National Bureau of Standards, 1939. Wall Ties, NHBC Standards online Homepage What is Wall Tie?, Ancon Building products company Homepage What are Wall Ties?: by Adrian Dawson, Certified surveyors of remedial treatments C.S.R.T. Building engineering