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Thermal Resistance Calculator
FreeCalculate wall thermal resistance R, check RE2020 and existing RT compliance.
Compliant with RE2020
📊Result
🔥R total
3.92m²·K/W
❄️U (transmittance)
0.255W/m²·K
📏Total thickness
120mm
External wall — RE20203,9 m²·K/W ✓
≥ 3.7 m²·K/W required
📐 Calculation formula
R = e / \u03bb (par couche)\nR_total = Rsi + \u03a3R_couches + Rse\nU = 1 / R_totalR = thermal resistance (m²·K/W), e = thickness (m), λ = conductivity (W/m·K), U = transmittance (W/m²·K). Rsi = 0.13, Rse = 0.04.
Standards & regulations
- RE2020Réglementation Environnementale 2020 — Bâtiments neufs
- RT existantRéglementation Thermique éléments par éléments — Rénovation
- NF EN 12524Propriétés hygrothermiques des matériaux de construction
This tool provides indicative estimates. Results do not substitute professional advice. Always verify with current regulations.
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