Barndominium & post-frame insulation done right

Steel panels get as cold as the outdoor air. Inside, cooking, showers, people, a curing concrete slab and wet vehicles all put moisture in the air. When that warm, humid air touches cold steel, it condenses, and the roof starts to drip. In a barndominium, that water ends up in the framing, the insulation and the living space.

Closed-cell spray foam applied directly to the steel solves the problem at the source. The foam bonds to the panel with no air gap, so humid air never reaches the cold metal, and at around 1 to 2 inches, depending on the product, it doubles as a vapor retarder.

A barndominium may look like an ag building, but Minnesota treats it as a single-family home. According to the Minnesota Department of Labor and Industry, barndominiums and shouses must meet the 2020 Minnesota Residential Code and the Minnesota Residential Energy Code. The points that affect insulation and the building envelope:

The two halves of a barndominium have different jobs, so they get different insulation plans. The living quarters have to hit full code R-values, pass the 3 ACH50 blower door test, and have spray foam covered by a thermal barrier such as drywall. The shop is often kept cooler, sees more moisture and may need fire protection over the foam if you weld or heat with a stove.

We plan both sides together, including the wall between them, so the house is quiet and comfortable and the shop stays dry.

The best time to talk to us is at the planning stage, while choices like wall framing depth, sheathing, liner panels, window details and how the shop will be heated are still open. A few decisions made early can save thousands of dollars in foam and make the blower door test easy.

Building up north? Pine County and the Brainerd Lakes Area (Crow Wing and Cass counties) are in Climate Zone 7, where living-space walls need R-21 instead of R-20, and we plan barndominium insulation there to match.