Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
We created a spreadsheet to sum the conductivities of each material multiplied by the thickness to give a nominal total for the construction. The conductivity is shown in the material properties of each material used in the construction, as is the thickness.
While you should have surface resistances for the exterior and interior for the sake of accuracy, in the grand scheme of your building they will make very little difference to the resulting energy use if they aren't there. You could tweak the conductivity of one of the materials to account for it.
