Fencalc XA2021
Common paths
Openings, joints, service penetrations and junctions can allow uncontrolled air movement.
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
Identify where sealing details are needed.
Envelope continuity
Sealing should align with the thermal envelope boundary.
Practice Task
- Mark leakage-prone junctions on a section.
- List sealing products required.
Calculator Tip
Use sealing notes as quality-control items in the report.
Worked Example: Leakage Path Review
Scenario
A section shows window frames, roof penetrations and external wall junctions but no sealing notes.
Calculator Entry
Use comments or report notes to flag sealing details that need confirmation.
Step-by-step method
- 1Mark likely leakage paths on the drawing.
- 2Add sealing products or workmanship notes to the specification.
- 3Identify inspection points during construction.
- 4Keep photo or checklist evidence with the project record.
Expected conclusion
Sealing compliance depends on continuous detailing and site evidence, not one isolated product.
Common Mistakes
- Treating air sealing as a product choice only, instead of a continuous envelope detail.
- Missing joints around windows, doors and service penetrations.
- Failing to plan site inspection evidence for sealing work.
Quick Knowledge Check
1. What should you confirm before applying this lesson to a project?
Junctions are reviewed.
2. Which piece of evidence should support the main input in this lesson?
Mark leakage-prone junctions on a section.
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.