What U-Value & R-Value Builder does
Layer and path resistances with SI and US U- and R-value results.
How it fits into the workflow
- Define the assembly paths, layers, thicknesses and conductivities.
- Check path fractions and any justified correction entered by the user.
- Review U-value, U-factor and R-value results with the exposed method trace.
Where it can save time
Layer libraries, reversible units and a visible calculation trace make early assembly comparisons faster and easier to review than isolated calculator results. Parallel paths can be tested without hiding the area fractions behind a single unexplained value.
Compliance and professional limits
The method can support early work informed by ISO 6946 and Approved Document L, but it is not a complete regulatory assessment. Repeating bridges, fasteners, cavities, ground contact and project-specific corrections may require a different verified method.
Professional boundary: Repeating bridges, fasteners, cavities, ground contact and other standard-specific corrections require an appropriate verified method.
In summary
U-Value & R-Value Builder is most useful when its saved output remains connected to the project decision and is reviewed within the limits described above.