Dear All,

In the building that I am modelling, corrugated metal roof is insulated
from below with glasswool. Below the glasswool, Armstrong rockwool ceiling
panels are suspended with a small gap (20-30 cm.). All ducts, pipes and
HVAC equipment are located below the suspended ceiling. Do you think the
ceiling panels can be considered extra insulation and be taken into
account when calculating the U-value of the roof construction? What about
the air gap in between?

Thanks,

Omer Moltay, LEED AP