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Wall thickness adjustment

Hello,

I am trying to look at thermal mass effects from a building I have created in Sketchup and imported in Openstudio. I have my base model- created a building to my specific measurements, defined the loads I need, and all that. So I have data from a year simulation for that model.

Now, what is the part that I'm getting stuck on is changing the wall thickness. I tried going into Sketchup and creating a square building and tracing out the wall thickness I want and then extruding it to the building height (all within the energy plus zone). When this is done, I get the walls I want but in the space where I outlined the walls, I get an opening that Sketchup calls a glass opening and I can't change the top part to a roof, bottom part to a floor.

So then I tried doing some reading on wall thickness and essentially what I got is Energyplus treats walls as infinitely thin and the only thing that affects this is the material used in the exterior/interior wall (the material wall thickness). http://energyplus.helpserve.com/knowledgebase/article/View/65/13/wall-thickness-impact-on-zone-volume

Any ideas?

-Thanks