North Carolina Building Contractor License Practice Exam

Which type of insulation is typically used in exterior walls?

1. Fiberglass batts

2. Cellulose

3. Spray foam

4. All of the above

The correct answer is: All of the above

Insulation plays a crucial role in regulating the temperature and enhancing the energy efficiency of a building. Each type of insulation mentioned can be effectively utilized in exterior walls, contributing to thermal performance and comfort. Fiberglass batts are commonly used due to their ease of installation and affordability. They are pre-cut sections that can fit between wall studs, providing good thermal resistance. Cellulose insulation, made from recycled paper products, offers excellent soundproofing and thermal benefits. It's typically blown into wall cavities, making it a suitable choice for retrofitting insulated walls. Spray foam insulation expands on application, sealing gaps and creating an air barrier that prevents heat loss and air infiltration. This makes it particularly effective in reducing energy bills and improving comfort within the space. Since all these types of insulation can serve the purpose of insulating exterior walls, the combination of these options reflects the versatility of insulation materials available for different building needs. This is why all of the options are correct in this context.