Which of the following is a common method to improve home insulation?

Adding insulation foam in walls and ceilings is a common method to improve home insulation because it effectively reduces heat transfer between the interior and exterior of a building. Insulation foam works by trapping air within its structure, which minimizes thermal conductivity and helps maintain desired indoor temperatures. This is particularly crucial in both hot and cold climates, as it can significantly lower energy costs associated with heating and cooling the home.

In contrast, while thicker windows can provide some benefits, they often focus on improving window performance rather than overall home insulation. Hollow bricks offer some insulation properties, but they are not as effective as dedicated insulation materials like foam. Replacing roof tiles with lighter materials may impact roof load but does not inherently improve insulation properties, as the thermal resistance primarily comes from the material's density and capacity to trap air. Hence, adding insulation foam is a targeted and efficient strategy to enhance a home’s insulation performance.