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Figure 1: Sketch of a typical façade construction where a sheathing board is used as<br />
wind barrier. Adapted from [1]. Figure 2: Photo of 8 mm thick MgO-board with a glass<br />
fibre mesh on both surfaces. The observed damages were caused by the fact that MgOboards<br />
absorb moisture from outside air.<br />
Water drops containing chloride ions appear on the outside of the boards – often so<br />
many that they run down the vertical boards and out via the air gap behind the siding<br />
boards (see Figures 4 and 5). The metal mountings for the MgO-boards can corrode<br />
heavily within a few years, cf. Figure 6.
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