Yannick wrote:The problem is that the 30 mm of rockwool is wrapped in PE foil, as indicated in the drawing.
If this is really the case, that would render the rockwool completely reflective above 1000 Hz, plus there is no plenum above the perforated ceiling, as the wrapped rockwool is resting directly on the ceiling tiles.
This would render the perforation completely ineffective at higher f, as witnessed by the measurements.
Removing the foil would have a dramatic effect.
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