Insulation — regional standards

Pick the standard that applies to where your building is located. Required U-values vary by country — the region you pick changes the compliance threshold and the estimated yearly savings in the insulation calculator.

• Poland — WT 2021

  Warunki Techniczne 2021. Wall ≤ 0.20, roof ≤ 0.15, floor ≤ 0.30 W/m²K.

• Germany / Austria / Switzerland — GEG

  Gebäudeenergiegesetz. Wall ≤ 0.24, roof ≤ 0.20, floor ≤ 0.30 W/m²K.

• United Kingdom — Building Regulations

  Approved Document L (2022 update). Wall ≤ 0.18, roof ≤ 0.11, floor ≤ 0.13 W/m²K.

• United States — IECC 2021

  Climate zone 4: wall R-20, roof R-49, floor R-30. Targets vary by zone.