Insulation R-Value Calculator
Use our Insulation R-Value Calculator to easily find out the thermal performance you need for your project and check if your setup meets NCC 2022 climate zone requirements.
Just select your system’s R-values, and choose a building element and climate zone. We will calculate your total R-value for you.
Total R-value is calculated by adding up each layer of your building assembly.
Example:
R2.0 insulation batt + R0.5 cladding + R0.5 plasterboard = R3.0.
Insulation R-Value Calculator
Add up your system's R-values and check it against the minimum for your climate zone and building element.
This tool is a general guide only, based on the NCC Deemed-to-Satisfy minimum R-Value provisions. Actual requirements can vary by state, specific location within a zone, and building design (e.g. NatHERS/BASIX assessments in NSW may set different targets). Always confirm with your local council, building certifier, or a qualified energy assessor before finalising a build.
NCC 2022 Minimum R-Values by Climate Zone
Under NCC 2022, Australian homes must meet specific minimum R-values depending on your climate zone; typically ranging from R5.0–R7.0 for ceilings, R2.5–R3.0 for external walls, and R1.5–R2.5 for floors.
| Building Element | Climate Zones 1–3 (Warm) | Climate Zones 4–5 (Mild) | Climate Zones 6–8 (Cool) |
| Ceiling / Roof | R5.0 | R5.5 | R6.0–R7.0 |
| External Walls | R2.5 | R2.8 | R3.0 |
| Floor (Suspended) | R1.5 | R2.0 | R2.5 |
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High-Quality Insulation, Fair Prices & Fast Delivery
We supply premium thermal and acoustic insulation batts, rolls, and rigid boards from top brands to keep your project compliant and energy-efficient. Order online for fast delivery across major cities or pick up your order same-day from our warehouse when you buy before 10 am.
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