Fencalc XA2021
Drawings and schedules
Plans, sections and elevations should agree with the dimensions entered into the calculator.
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
Create shading notes that can support the compliance result.
Avoid overclaiming
If shading is uncertain, treat the element as unshaded until the design is confirmed.
Practice Task
- Prepare a shading checklist for one elevation.
- Flag missing details.
Calculator Tip
Use unshaded mode as a conservative first pass.
Worked Example: Overhang Check
Scenario
A north-facing window has height relationship H = 900 mm. The proposed overhang projects P = 600 mm from the wall face.
Calculator Entry
Enter the shading method, projection and height relationship only if the drawing evidence supports it.
Step-by-step method
- 1Confirm the shading is external and fixed.
- 2Measure H and P from consistent points on the section.
- 3Apply the required multiplier for the project context.
- 4Record whether P is deep enough and whether side coverage is adequate.
Expected conclusion
If the overhang cannot be measured or justified, treat the opening as unshaded until confirmed.
Common Mistakes
- Claiming shading that is not external, permanent or measurable.
- Measuring projection and height from inconsistent points on the opening.
- Counting uncertain future screens or occupant-controlled items as compliant shading.
Quick Knowledge Check
1. What should you confirm before applying this lesson to a project?
Evidence exists.
2. Which piece of evidence should support the main input in this lesson?
Prepare a shading checklist for one 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.