Potential Impact of Fenestration Solar Gain and Interior Blinds

ADVISORY PAPER - January 2026

Dear members,

As homes adapt to increasing climate extremes, managing solar heat gain through glazing has become critical. While LowE glass improves energy performance, higher SHGC values combined with interior reflective blinds can unintentionally create overheating conditions that may impact window systems.

Terry Adamson, Technical Director, wished to share this document as a public service to Canadian architects, home builders, building officials, consumers and suppliers of fenestration products.

Please see the attached document below:

Solar gain and interior blinds_Advisory paper (1).pdf

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