Application of polyurethane foam insulation
Lengthened structural life, plus a better-protected product
With the airform inflated, polyurethane foam insulation is applied inside, forming a layer 1.5 to 2 inches thick. This layer acts as a continuous and uninterrupted thermal barrier between the exterior and interior of the dome, an important element to keeping temperatures consistent within the structure. This insulation protects both the concrete dome structure and the product stored within.
The intermediate structural role of the polyurethane foam
To the foam, workers apply a network of two-inch-square metal plates called stickers with rods attached to their centers. A final layer of foam insulation is applied, and premat steel reinforcing is placed on top and connected to these sticker rods, creating a grid across the entire interior surface. With fasteners inserted and foam hardened, this layer serves a structural role in supporting the initial layers of steel matting and concrete.