Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
I assume you mean insulation that has a sheet 24" down separate from a horizontal sheet the goes 24" in, as opposed to a single piece that is a 24" x 24" block around the perimeter. If it's the latter then you should just be able to enter it in, but you're right on the former - it's not technically possible. I'd email support just to register the wish and in case they have some better ideas, but I can think of two ways to approximate it. First, assume you have vertical only, but calculate the equivalent thickness to give you about the same performance of the horizontal. Or Second, only do vertical again, but add a very thin layer of insulation to the bottom of the construction, again based on a calculation getting equivalent performance. An idea to figure this out is to run a simulation with no insulation, then one with only the horizontal, and then one only defining the insulation in the construction to find the correct equivalent thickness. Depending on the purpose of your model that might all be overkill though, and the ground conduction calcs aren't the most accurate things anyway.
