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[EnergyPlus_Support] Ventilated loft space - no infiltration through ceiling

Hi All,

I've set up a house with a ventilated, unconditioned loft space above an insulated ceiling. I have defined cracks for the ceiling, yet output shows no airflow occurring through the ceiling, while there is plenty of air movement in the loft space. I assume this is due to setting boundary conditions to Surface rather than Outdoors at the ceiling. Yet, when I set to Outdoors, I get errors regards surface matching, as there is construction above the ceiling (the roof and gable walls).

Any idea how to go about this correctly?
The output I want is air leakage through the ceiling.



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