Insulation for potato and produce storage buildings
A produce storage building has one job for eight months of the year: hold a narrow temperature and humidity band without variation. The roof and walls are the instrument that does it, and a weak point in the envelope shows up as loss in the pile rather than as a stain on the ceiling.
What fails, and what we do about it
Potato storage
Temperature swings at the envelope, condensation onto the pile, and hot spots near thermal bridges.
Continuous foam envelope with no bridge at the purlin, coated for washdown.
Onion and produce sheds
Humidity control fighting an envelope that leaks air.
Foam air barrier detailed at eave, ridge and penetrations.
Loading and grading areas
Door cycling driving moist outside air into a conditioned space.
Sealed transitions between conditioned and unconditioned bays.
The envelope is the storage system
Ventilation and refrigeration equipment gets the attention, but both are working against the envelope. Every air leak and every thermal bridge is a load the equipment has to overcome continuously, for months. Sealing and insulating the envelope in a single continuous layer reduces that load rather than compensating for it.
This matters most in the northern Red River Valley, where storage buildings hold crop through winters that put a sixty-degree difference across the wall.
Where storage envelopes usually fail
At the transitions: eave, ridge, door frames and the junction between the conditioned storage and any attached grading or loading area. Those are the points where a continuous insulation layer is hardest to maintain and where air moves most, and they are where the temperature map of a storage building typically shows its worst numbers.
A thermal bridge at the purlin produces a cold stripe on the inside face, and a cold stripe over a pile is where condensation and then spoilage begin.
Working to a storage specification
These buildings are designed around a holding specification — a temperature and a relative humidity, held for a defined period. The envelope either supports that specification or fights it. We ask for the target conditions and the season length before recommending an assembly, because the answer changes the thickness and the coating.
Where we do this work
Six states- South DakotaSioux Falls · Rapid City
- NebraskaOmaha · Lincoln
- IowaDes Moines · Cedar Rapids
- North DakotaFargo · Bismarck
- MinnesotaMinneapolis · Rochester
- Eastern WyomingCheyenne · Casper
One vertical linked from every state hub, rather than a separate agricultural page per state. The building stock genuinely differs by region; the service does not.
Common questions
- When can this work be scheduled?
- Between seasons, when the building is empty. That window is short and it is the same window everyone else in the valley is working in, so these projects are quoted and booked well ahead.
- Can foam be applied over an existing insulated storage building?
- Usually, but the existing insulation has to be assessed first. Foam applied over a failed or wet assembly traps the problem. We inspect before recommending an approach.
- Will this help with the refrigeration load?
- It reduces it. Every air leak and thermal bridge is a load the equipment has to overcome continuously through the storage season, so tightening the envelope lowers the work the system has to do rather than adding capacity.
- Can you insulate the walls and roof as one continuous envelope?
- That is the preferred approach where the building allows it, because the junction between two separately insulated planes is exactly where the envelope tends to fail.
The systems behind this work
Tell us what the building does, and we will tell you what the roof needs.
A-1 Roofing works agricultural and industrial buildings across 6 states. Free assessment, response within 24 business hours.
41-year commercial roofing and insulation record