I was wondering what would be the correct way to model Reflective Batts in BERS Pro?

Use the R Gap tools to calculate the R value of the reflective cavities that a product is made to form and then add that R value as bulk insulation to the ceiling etc. Exposed surfaces facing up, e.g. directly under roof tiles or the top layer above the ceiling insulation should be modelled as having an emittance of 0.9.

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