You use this dialog to specify the default properties for surfaces and openings in the building. The constructions defines the conductivity of various surfaces. The constructions specified for roofs, exterior walls, partitions, and interior windows affect the heating and cooling loads analysis for the project. You specify constructions for the default <building> when the Building Constructions dialog is accessed from the Project Information, Energy Data settings or from the General tab in the Heating and Cooling Loads dialog. When the Building Construction dialog is accessed from the Instance Properties dialog for a space, you can create a new construction that can be applied to individual spaces, however, you cannot edit the default <building> parameters.
Click the drop-down for each of the constructions to select the surface type.
See the attached file for detailed surface construction information.