2.1.3 Building Envelope Descriptions

The user shall provide accurate descriptions for all building envelope assemblies including exterior walls, windows, doors, roofs, underground walls and floors. The user shall provide data for all of the required descriptors listed in Appendix A that correspond with these assemblies. However, the following exceptions apply:

• Any envelope assembly that covers less than 1% of the total area of that assembly type (e.g., exterior walls) need not be separately described. If not separately described, the area of an envelope assembly must be added to the area of the next most similar assembly of that type.
• Exterior surfaces whose azimuth orientation and tilt differ by no more than 45º and are otherwise the same may be described as a single surface or described using multipliers. This specification would permit a circular form to be described as an octagon.