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Orientation Basics

Define orientation from the outside face of the envelope.

12 minOrientation and Site Planning
Diagram for Orientation Basics
Orientation and Site Planning Orientation Basics
How to use the diagram Read the visual first, then connect each label to the lesson text and your calculator inputs. The aim is to make every assumption visible before you calculate.

Learning Objective

Classify each external envelope element consistently.

Direction of assessment

Orientation is based on the outward direction of each external envelope element. This keeps the compliance check tied to the building geometry rather than room names or design intent.

Why it matters

Orientation affects solar exposure and can change the limits or design decisions used elsewhere in the XA workflow.

Practice Task

  • Mark outward arrows on each elevation.
  • Assign each facade to an orientation sector.

Calculator Tip

Enter orientation before checking SHGC or shading so the correct rule group is used.

Worked Example: Classifying Facades

Scenario

A house has a street facade facing 18 degrees east of north, a rear facade facing south, and two side facades facing east and west.

Calculator Entry

Select the orientation that matches each outward-facing facade before checking SHGC or shading.

Step-by-step method
  1. 1Mark the north point on the plan.
  2. 2Draw an outward arrow perpendicular to each external facade.
  3. 3Assign each facade to the correct orientation sector.
  4. 4Use the same sector labels in fenestration, shading and reporting notes.
Expected conclusion

The result is a defensible orientation schedule that another reviewer can follow.

Common Mistakes

  • Labelling rooms by name instead of using the outward-facing facade direction.
  • Treating angled facades casually without documenting the selected sector.
  • Changing orientation assumptions between fenestration, shading and reporting.

Quick Knowledge Check

1. What should you confirm before applying this lesson to a project?

Every facade has an orientation.

2. Which piece of evidence should support the main input in this lesson?

Mark outward arrows on each elevation.

3. What is the safest action if the information is incomplete?

Flag the missing evidence, use a conservative assumption where appropriate, and avoid claiming compliance until the information is confirmed.

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