Metric Republic / Building Physics & Energy / Insulation Thickness for Target U-Value

Insulation Thickness for Target U-Value

Estimate insulation thickness needed to reach a target U-value after accounting for other thermal resistances.

How it works

Estimate insulation thickness needed to reach a target U-value after accounting for other thermal resistances.

Formula:
Rtarget = 1 / Utarget; Rins = max(0, Rtarget − Rother); dins = Rins × λ.

Before you use the result: Do not use simplified thermal or moisture estimates as a substitute for a complete building-physics assessment.

Practical use

Use verified material data and project geometry. Treat results as planning estimates and compare them with the energy/thermal requirements that apply to the project.

Keep units consistent with the source information.
Use project-specific densities, pack sizes and coverage rates where provided.
Round purchasing quantities to supplier packaging and delivery rules.

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