New Energy Efficiency Standards for Insulation Materials (Glass Wool and Extruded Polystyrene Foam) Compiled

Today, a working group in the Top Runner Program^* established under the Agency for Natural Resources and Energy (ANRE) compiled new target standard values and such for insulation materials as building materials under the Top Runner Program based on the Act on Rationalizing Energy Use (Act No. 49 of 1979), which they began discussing in June 2021.
The new target standard values have been increased from 5 to 6%, calculated based on required energy efficiency performance for new houses built from 2030 onward.

*Working Group on Classification Standards for Building Materials, Etc., of the Energy Efficiency and Conservation Subcommittee of the Committee on Energy Efficiency and Renewable Energy under the Advisory Committee for Natural Resources and Energy

Outline of the new target standard values for insulation materials under the Top Runner Program

Target equipment:

Glass wool:

Glass wool insulation materials specified in JIS A 9521:2022 with a density of 40 [kg/m³] or less

Extruded polystyrene foam:

Extruded polystyrene foam insulation materials specified in JIS A 9521:2022

Target fiscal year:

FY2030

Category:

Target standard values will be set separately for glass wool and extruded polystyrene foam

Target standard values:

The new target standard values and the improvement rates from the current ones are as follows.
 

Category	Current target standard value [W/(m・K)]	New target standard value [W/(m・K)]	Improvement rate
Glass wool	0.04156	0.03942	5.1％
Extruded polystyrene foam	0.03232	0.03036	6.1％

Related materials

• Report compiled by the Working Group on Classification Standards for Building Materials, Etc. (Outline) (October 2022) (in Japanese)(PDF:75KB)
• Report compiled by the Working Group on Classification Standards for Building Materials, Etc. (October 2022) (in Japanese)(PDF:733KB)

Division in Charge

Energy Efficiency Division, Energy Efficiency and Renewable Energy Department, Agency for Natural Resources and Energy