Red Seal Bricklayer Practice Exam

What type of insulation is best used in conjunction with brick walls?

1. Glass wool insulation

2. Rigid foam or spray foam insulation

3. Mineral wool insulation

4. Cellulose insulation

The correct answer is: Rigid foam or spray foam insulation

Rigid foam or spray foam insulation is considered the best option for use with brick walls due to its high insulating properties and moisture resistance. This type of insulation offers superior thermal performance, which is essential in preventing heat loss in colder months and heat gain in warmer months. Adjacent to brick walls, which can retain moisture due to their porous nature, rigid foam and spray foam insulation help create a moisture barrier that can prevent issues such as mold and mildew, which are detrimental to both the structure and indoor air quality. Additionally, these insulation types have low thermal conductivity, making them effective at reducing energy costs. Additionally, the application of rigid foam or spray foam insulation can fit snugly against the exterior of the brick, ensuring there are no air gaps where heat could escape, thus improving energy efficiency. This compatibility with the thermal mass of brick walls helps maintain stable indoor temperatures by moderating temperature fluctuations. In contrast, while glass wool and mineral wool provide good insulation properties, they may not offer the same level of moisture control when installed next to brick surfaces, which can be problematic. Cellulose insulation, although effective and eco-friendly, also does not match the moisture-resistant benefits of rigid or spray foam when it comes to use directly against brick walls.