Future bathroom. Just thinking of leaving a small air gap between the gypsum and siporex. The siporex will be plastered/leveled up to the ceiling gypsum later, so I don't know how much of a role it plays anyway. Thoughts? Maybe apply a bead of MS polymer there? Considering potential moisture migration, etc. The siporex is 250 mm thick and recently re-plastered externally.
Wall and ceiling junction in a future bathroom, with gypsum board and aerated concrete block, showing a small gap for ventilation concerns.
 
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