What type of insulation is commonly used in residential construction?

The answer is comprehensive as it acknowledges that all the listed types of insulation—fiberglass, spray foam, and cellulose—are indeed commonly used in residential construction. Each type has its own unique properties and benefits, making them suitable for different applications and preferences in building practices.

Fiberglass insulation is popular due to its cost-effectiveness, non-combustibility, and ease of installation. It is available in batts or rolls that can be easily fitted into walls, ceilings, and floors, providing good thermal resistance.

Spray foam insulation is favored for its superior air-sealing properties and energy efficiency. It expands on application, filling gaps and cracks, which helps to reduce air leaks and improves the overall insulation performance.

Cellulose insulation, made from recycled paper products, is often used for its eco-friendliness. It generally provides good thermal performance and is treated for fire resistance, making it a popular choice, especially in retrofitting older homes.

The inclusion of all these materials in the correct answer reflects the diverse options available to builders and homeowners, emphasizing that the choice of insulation can depend on several factors, including budget, energy efficiency goals, and specific building needs.