Red Seal Insulator (Heat and Frost) Practice Exam

What type of insulation is commonly used in exterior walls?

1. Fiberglass batts, foam board, or spray foam insulation

2. Only cellulose insulation

3. Only rigid foam insulation

4. Only mineral wool insulation

The correct answer is: Fiberglass batts, foam board, or spray foam insulation

The choice of fiberglass batts, foam board, or spray foam insulation as common options for insulating exterior walls reflects the diverse characteristics and benefits these materials offer. Each of these types presents unique advantages that make them suitable for use in various applications related to exterior wall insulation. Fiberglass batts are widely utilized due to their effective thermal performance and are available in pre-cut sizes that fit standard wall cavities. They are relatively easy to install and provide good soundproofing, making them popular in residential construction. Foam board insulation, on the other hand, is praised for its high R-value per inch, making it an excellent choice for areas where space is limited. It is also moisture-resistant, which helps in preventing issues related to mold or deterioration in damp environments. Spray foam insulation offers superior air sealing properties, which significantly enhances energy efficiency. It expands upon application, filling any gaps or cracks, thus minimizing thermal bridging and drafts. This combination of materials allows builders and insulators to select appropriate products based on specific needs such as cost, ease of installation, R-value requirements, and environmental conditions. The versatility in their application contributes to their predominance in insulating exterior walls.