How can spray foam insulation be applied into walls?

Spray foam insulation is specifically designed to be applied using a process that allows it to expand and fill cavities effectively. The method of spraying or injecting is optimal because it enables the foam to adhere to surfaces, forming an airtight seal that prevents air migration and improves energy efficiency. This application process ensures that the foam reaches all nooks and crannies within the walls, providing better insulation and reducing the chance of moisture accumulation, which can lead to mold growth.

The use of compressed air, squeezing from tubes, or hand-rolling would either limit the effectiveness of the insulation or would not provide the necessary application characteristics that spray foam insulation requires. These methods do not allow for the same level of expansion and coverage, which is critical for achieving optimal insulation performance. Thus, spraying or injecting is the preferred technique in this context.