When using QII, the CBECC Res engine requires any surfaces (walls, roofs, floors) be selected as different construction assemblies between the existing part of the house or the garage, and the new surfaces. Thus if you had an R-19 Wall selected for the new part of the home, your Garage and/or Existing part of the home would need to use a different wall, for instance “R-19 Existing” or whatever other unique name you wish to assign. So you cannot use the exact same assembly names in the library in these cases.
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