SUSTAINABLE HOUSING INSIGHT Energy Efficiency Ensure that the air barrier system is continuous and uninterrupted where stairs occur on exterior walls. To avoid interruptions, install the air barrier before the stair is put in place. RELATED PUBLICATIONS About Your House: Accessible Housing by Design—Ramps, Canada Mortgage and Housing Corporation (product no. 65023) About Your House: Preventing Falls on Stairs, Canada Mortgage and Housing Corporation (product no. 63637)