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  lambda = thermal conductivity in W/(m·K)

Minimum R required by climate zone:
  - Zone A (highland / severe cold)   : R_min = 6.5 m²·K/W
  - Zone B (temperate)                : R_min = 4.5 m²·K/W
  - Zone C (mild — coastal south)     : R_min = 3.5 m²·K/W

Typical conductivity values:
  - Mineral wool 035 : lambda = 0.035 W/(m·K)
  - Mineral wool 040 : lambda = 0.040 W/(m·K)
  - Rigid PIR 022    : lambda = 0.022 W/(m·K)

§4.2 — Vapour control layer: minimum Sd value (BS 5250 / BS EN ISO 13788)
The vapour control layer must provide sufficient resistance to vapour
diffusion (Sd value) according to the service class:
  - Service class 1 (dry interior)   : Sd ≥ 5 m
  - Service class 2 (humid interior) : Sd ≥ 18 m
  - Service class 3 (very humid)     : Sd ≥ 50 m
Any vapour control layer with Sd below the required minimum is NON-COMPLIANT.

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