Does a Wall in Nunavut Need a Vapour Barrier?
Yes. Under the National Building Code of Canada, Part 9, Article 9.25.4, a vapour barrier is required in insulated wall assemblies, and that requirement…
Does a Wall in Nova Scotia Need a Vapour Barrier?
Yes, in Nova Scotia. The National Building Code of Canada requires a vapour barrier in insulated wall assemblies, and unlike the American model code…
Does a Wall in Northwest Territories Need a Vapour Barrier?
Yes. The National Building Code of Canada requires a vapour barrier in insulated assemblies, and that requirement carries no climate-zone exception…
Does a Wall in North Dakota Need a Vapor Barrier?
Yes. North Dakota’s counties sit in IECC climate zones 6A and 7, and neither zone falls under the code’s exception for warm climates, so a vapor retarder…
Does a Wall in North Carolina Need a Vapor Barrier?
Yes and no. North Carolina’s 100 counties sit in three different climate zones, and the 2021 code writes a different answer for each.
Does a Wall in New York Need a Vapor Barrier?
Yes. New York’s frame walls fall under IECC Climate Zones 4A, 5A, and 6A, and the 2021 International Residential Code exempts only Climate Zones 1, 2…
Does a Wall in New Mexico Need a Vapor Barrier?
Whether a New Mexico wall needs an interior vapor retarder depends on which of the state’s three climate zones that wall sits in.
Does a Wall in New Jersey Need a Vapor Barrier?
Short answer: in New Jersey, yes. The state’s 21 counties split between IECC climate zones 4A (14 counties) and 5A (7 counties), and neither zone falls…
Does a Wall in New Hampshire Need a Vapor Barrier?
Yes. New Hampshire sits entirely within IECC Climate Zones 5A and 6A, and neither zone appears on the short list where the International Residential Code…
Does a Wall in Newfoundland and Labrador Need a Vapour Barrier?
A vapour barrier is required in insulated wall assemblies across Newfoundland and Labrador under the National Building Code of Canada, and that…