# NCC 2019 Façade Calculator and Better Building
The NCC 2019 Volume One façade calculator is a tool used in Australia's National Construction Code (NCC). It helps assess the thermal performance of a building's façade, considering factors like glazing, insulation, and shading. It aids in ensuring compliance with energy efficiency standards.
While a common currency for building certifiers to address NCC compliance, the NCC 2019 Volume One façade calculator is not required, nor does it meet Section J requirements. The statement below summarises that provided with the NCC 2019 Volume One façade calculator and clarifies it is **not considered legal or professional advice**.
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By using the NCC 2019 Volume One façade calculator, users must agree that while care has been taken in its preparation, it may not be current or complete. The Board, Commonwealth, States, and Territories of Australia disclaim liability for any loss or damage arising from the calculator's use. No warranties are made regarding its accuracy or fitness for purpose, and it's not to be considered legal or professional advice. Users rely on the calculator at their own risk.
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More specifically, the NCC 2019 Volume One façade calculator only meets the partial requirements of Specification J1.5a Calculation of U-Value and solar admittance as it does not undertake AS/NZ 4859.2 calculations as per [J1.2 Thermal construction — general](https://ncc.abcb.gov.au/editions/2019-a1/ncc-2019-volume-one-amendment-1/section-j-energy-efficiency/part-j1-building).
> **Specification J1.5 a -** (b) The *Total system U-Value* of the wall component of a *wall-glazing construction* must be calculated as the inverse of the *Total R-Value*, including allowance for thermal bridging, in accordance with— (i) AS/NZS 4859.2;
> **J1.2 Thermal Construction** - (e) The *required* *Total R-Value* and *Total System U-Value*, including allowance for thermal bridging, must be— (i) calculated in accordance with AS/NZS 4859.2 for a roof or floor; or
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Better Building provides a flexible approach to Specification J1.5 a and meets the calculation requirements set forth in AS/NZS 4859.2.
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