We’ve watched the codes and standards tighten for years now, requiring windows and doors installed into new builds to meet ever-higher performance metrics for air/water ingress and insulating value. And they will continue to tighten as Canada’s code authorities follow the federal Roadmap to make all new buildings built in Canada meet net-zero energy performance standards by 2030. But what about the inefficient existing buildings out there that represent a far larger proportion of the homes in the country and therefore a much bigger impact to carbon emissions? Never fear, regulators have not forgotten about them. Frank Lohmann, director of building science for the Canadian Homebuilders Association, joins Fenestration Conversations to talk about plans to update the existing buildings section of the National Building Code to add an energy-efficiency requirement for renovations and retrofits.