This wall is constructed from besser blocks and has been rendered over. Behind the wall, there is a raised courtyard area and the breaches in the existing waterproof membrane behind the render were allowing some moisture to seep through as evidenced by smaller areas of render delamination.
The way besser blocks are designed, moisture is able to move through them. However, the steel reinforcements that run through the cores of the besser blocks are encased in cement which protects the steel from moisture. Due to the high alkalinity of concrete (pH of 12 to 13), the steel reinforcing bars are passivated by an iron oxide film (Fe2O3) that provides a protective layer to the steel.
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