Fencalc XA2021
Assembly matters
The performance of a floor depends on the full assembly, including slab, insulation, air spaces and finishes where applicable.
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
Know what information is required before checking a floor.
Evidence
Manufacturer data, drawings and specifications should support the value used.
Practice Task
- Create a floor assembly data sheet.
- Identify missing product evidence.
Calculator Tip
Attach supporting documents to the project record.
Worked Example: Envelope Floor Decision
Scenario
A slab-on-ground living area and an internal upper floor both appear on the drawings.
Calculator Entry
Only enter floor assemblies that form part of the thermal envelope.
Step-by-step method
- 1Identify which floor separates conditioned space from ground, outside air or unconditioned space.
- 2Exclude internal floors that are not part of the thermal envelope.
- 3Record slab, insulation and edge assumptions.
- 4Check drawings against the floor compliance note.
Expected conclusion
Scope clarity prevents internal floors from distorting the envelope check.
Common Mistakes
- Including internal floors that are not part of the thermal envelope.
- Forgetting edge conditions, ground contact or unconditioned spaces.
- Merging different floor assemblies without a clear reason.
Quick Knowledge Check
1. What should you confirm before applying this lesson to a project?
Assembly layers are listed.
2. Which piece of evidence should support the main input in this lesson?
Create a floor assembly data sheet.
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.