The orientation of both opaque and glazed constructions is important thermally and is governed by the following rules.
1. The layers of a construction are listed in order from outside to inside.
2. For Roofs, External walls, Ground/Exposed Floors, External Windows and Rooflights, the outside of the construction faces the external environment (or in the case of a Ground Floor the ground).
3. Internal Ceiling/Floors are defined as ceilings, so the outside of the construction is the upper side. Note that as a consequence, these constructions are displayed in the reverse orientation to ground or exposed floors.
4. The orientation of Internal Partitions and Internal Windows depends on the particular instance in the building, and is determined from the relative ordering of the adjacent spaces in the room browser. The convention is that the inside of the Internal Partition or Window, as defined in the Constructions Database, is the side facing the space that appears first on the browser.
5. Doors are treated in the same way as external constructions or internal partitions, depending on whether they have internal or external adjacency.
