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