Insulation R-Value Calculator

Calculate total R-value from layered insulation materials.

Estimate only — not a substitute for a licensed tradesperson, a certified engineer, or sign-off from your local building surveyor. Verify against current standards and site conditions before ordering materials or starting work.

Result

Total R-value: 4

Sums declared layer R-values only - not independently verified against the current energy-efficiency climate-zone tables (unlike the stair/balustrade calculators in this build, this figure was not checked directly against ncc.abcb.gov.au). Confirm the required minimum for your climate zone and the NCC edition currently adopted in your state before installation.