What is a blower-door test and why is it required?

A blower-door test uses a fan to depressurize the house and measure air leakage through gaps in the shell. North Dakota's energy code requires new homes to come in under a set leakage limit, which confirms the envelope is tight enough to keep heat in and drafts out.

How Are Homes Insulated for North Dakota Winters?

Q: How are homes insulated for North Dakota winters?

North Dakota's cold-climate building code requires high insulation values in walls, ceilings, and foundations, continuous insulation to limit thermal bridging, and a blower-door air-tightness test on every new home. Insulation is paired with quality windows and careful air sealing so the shell works as a system.

Q: Does better insulation lower heating bills in North Dakota?

Yes. A tight, well-insulated home costs less to heat through a long winter, holds a steadier temperature room to room, and stays comfortable on the coldest days. Because the measures are built into the structure, they keep paying back for the life of the home.

North Dakota sits in one of the coldest climate zones in the country, so a new home here is built to a higher insulation and air-sealing standard than homes in milder states. Here is what goes into a warm, efficient home in the Bismarck-Mandan area and why it pays off every winter.

Cold-climate code sets the baseline

North Dakota falls in a cold climate zone, and the state building code adopts the 2021 energy code, which calls for high insulation values in walls, ceilings, and foundations, plus continuous insulation to limit thermal bridging. Every new home is built to at least this baseline, so efficiency is standard rather than an upgrade.

The blower-door test

Insulation only performs if the home is also sealed against air leaks. That is why the energy code requires a blower-door test on new dwellings: a fan depressurizes the house to measure how much air leaks through gaps in the shell, and the home must come in under a set limit. Passing it confirms the envelope is tight, which keeps heat in and drafts out.

Where the insulation goes

Walls. Cavity insulation plus a layer of continuous exterior insulation reduces heat loss through the framing itself.
Attic and ceilings. Deep attic insulation matters most, since heat rises and the ceiling plane is a major loss point.
Foundation and basement. Insulating basement walls and under slabs keeps the lower level comfortable and usable year round.
Rim joists and penetrations. Sealing and insulating these hidden gaps closes off common drafts.

Windows, doors, and the whole envelope

Quality windows and exterior doors round out the shell. In a cold climate, well-rated windows reduce heat loss and condensation, and proper installation prevents leaks around the frames. The home works as a system: insulation, air sealing, and windows together determine how warm it stays and how low the heating bills run.

Why it pays off

A tight, well-insulated home costs less to heat through a long North Dakota winter, holds a steadier temperature room to room, and stays comfortable on the coldest days. Because these measures are built into the structure, they keep paying back for the life of the home rather than needing constant attention.

Built to perform

Artisan Homes builds to North Dakota’s cold-climate code and can walk you through insulation, air-sealing, and window options during design so you understand how your home will perform before it is built. Artisan Homes serves Bismarck, Mandan, Lincoln, and the surrounding Burleigh and Morton County area. Call (701) 401-5022 or email artisanhomesnd@gmail.com.