This standard specifies the method for calculating the thermal resistance of plate glass and the heat transfer coefficient [U value] required for thermal calculations when plate glass is used for windows on the exterior walls of buildings.
JIS R 3107:1998 history
2019JIS R 3107:2019 Calculation of thermal transmittance of glazing
1998JIS R 3107:1998 Evaluation on thermal resistance of flat glasses and thermal transmittance of glazing