Thermal Bridging Calculation Tool, 2018
- Thermal Bridging Calculation Tool
- Valid from
- Information provider
- BRANZ Limited
- Information type
The Thermal Bridging Calculation Tool determines the thermal performance of cavity insulated timber framed walls. It may also be used to determine the steady state R-value (U-value) and compare results with a simple one-dimensional isothermal plane calculation for the same relative framing ratio.
The excel spreadsheet tool may be used to investigate:
- Changing overall window/door areas
- Changing the size of individual windows and doors.
- The benefits of increasing insulation R-value
- Changing glazing type
- Eliminating unnecessary framing elements
The tool also produces a visual representation of the heat flow like what is seen with a thermal imaging camera.
The basis of the tool is 3D finite element pre-modelling using 650 mm x 650 mm face areas represented by a grid of 13 x13 cells with size 50 mm x 50 mm. These parts are then joined as sections of wall which can be added together to create a complete length of wall for analysis.