Pole barn spray foam insulation in Brooks is applied to the inside face of the cladding, across the girts and the posts together. Post-frame is the default building out here, and a great many of them are holding something that came off irrigated ground and has to keep.
Post-frame buildings holding an irrigated crop
This is farmed country of a particular kind. The ground here is watered rather than rain-fed, which means the crops are higher value and more perishable than the dryland cereals grown an hour away. Potatoes, seed, beets and vegetable crops all end up sitting in a post-frame building for months, and the building was very often put up to keep rain off rather than to hold a condition. That gap between what it was built for and what it is now asked to do is the whole subject of this page.
Stability matters more than a low temperature
Growers usually ask how cold a building can be held. The more useful question is how steady. Most stored crops tolerate a range and are damaged by movement within it, because every swing drives moisture somewhere, and moisture on a stored crop is what starts rot and sprouting. A sealed, insulated shell narrows the daily swing more than any amount of mechanical capacity added to a leaky building, and it does so without running anything. That is the argument to make first, before anybody prices equipment.
Afternoon sun on a shell with no mass at all
A post-frame building is a thin skin on a light frame. There is nothing in it to absorb a load, so it follows the outside almost directly, and on a clear Brooks afternoon the south and west cladding is delivering heat straight through to whatever is stacked inside. There is nowhere to fit anything between the girts on a wall built this way, which is why sprayed foam across the whole inside face is the assembly that suits it. It covers the frame and the cladding as one surface rather than leaving a grid of untreated timber and steel.
What the fans are doing, and what they cannot do
Most of these buildings have some ventilation, usually fans added at some point to deal with a problem. Fans move air and they do that well. What they cannot do is remove a load that is arriving through the roof and walls all day, and running them harder against an uninsulated shell mostly moves hot air around. Sealing the shell changes what the fans are being asked to do, and it usually means they can run less and achieve more, which is worth checking after the work rather than assuming.
Pole Barn Spray Foam Insulation Brooks: Common Questions
How cold can you hold the building? The better target is how steady. Movement damages stored crop more than a slightly higher temperature does.
Can anything be fitted between the girts? No. A post-frame wall has no cavity, which is why the foam goes across the whole inside face.
Do we still need the fans? Yes, and they will be doing a smaller job. It is worth measuring afterwards rather than guessing.
Size the assembly with the R-value calculator, then get a free Brooks quote. More on Pole Barn Spray Foam Insulation Alberta.