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This webpage calculates the R-value of walls, roofs and suspended floors for most insulation material R-values. It uses the "isothermal planes" method, the same method as used in NZS4214:2006.
New methods for determining the thermal resistance and construction R-value of building elements are contained within H1/AS1 5th edition amendment 1 and include methods to calculate the R-values for slab-on-ground floors, windows, doors and skylights.
The R-Value formula is the measure of a material’s ability to resist heat flow. The higher the R-Value, the better the insulation. This is because it means that the material can better resist heat flow, keeping your home warmer in the winter and cooler in the summer. The formula is:
Calculating R-value involves ASHRAE making measurements of heat flux over different insulation materials and determining the R-value of insulation based on how quickly (or slowly) this heat flows through the material.
Make better-informed decisions about building materials, construction methods and designing healthier, safer and more sustainable houses using our range of calculators and tools developed from BRANZ research.
18 lut 2014 · Once changes are made, the calculator updates R-values and costs. A team of software developers is offering a free online calculator you can use to compare the thermal performance and cost of a variety of roof, floor, and wall assemblies.
Appendix F in the new H1/AS1 and H1/VM1 gives an acceptable method for determining the construction R-values of slab-on-ground floors, with extensive tables in H1/AS1 showing construction R-values for selected slab-on-ground floor scenarios.
