Spray foam insulation is a top choice for agricultural structures and provides a unique ability to create a vapor and insect barrier. It penetrates tight spaces and crevices and then expands into place and thus creates a tight seal that other insulation products can’t match.
When used in metal buildings, spray foam provides a high R value per inch. Also, if you have an existing building that was initially built without insulation spray foam is much easier to install after the fact than any other option you might consider.
Additionally, spray foam bonds to the structure and sheeting and can increase rigidity and strength. This can be of particular benefit on older existing structures that have experienced mild rusting and other structural and exoskeleton degradation over the years.