How do I model ceiling/roof metal sheeted sandwich panels?
Ceiling sandwich panels can be best modelled by choosing the “Roof, no Cavity” of the “Above the Ceiling” options, plasterboard for the ceiling, iron for the roof and adjusting the Rvalue of the added insulation. The R value displayed for the plasterboard is 0.06, but the steel sided sandwich panel has Rvalue close to zero. So subtract 0.1 from the Rvalue of the EPS or urethane foam added between the sheets.