Dear all,

Our project recently received the comment below regarding window assembly U-value calculations. The project is located in Ireland and therefore the assembly values (which include frame and glass) have been calculated via a European software which complies with BS (British Standard), EN (European Standard) and ISO requirements. The following comment specifically refers to the LBNL software, however is it acceptable to demonstrate compliance with an European alternative?

Provide additional information to confirm that the framed assembly U-value was used for the Proposed Case windows (such as: showing that the whole window assembly has been tested by NFRC; verifying that LBNL Window5 calculations have been provided for the whole assembly; or verifying that the frame effects are captured within the energy modeling software).