What is the main difference between Type I and Type II construction?

What is the main difference between Type I and Type II construction?

• A. Type I uses wood framing
• B. Structural components lack insulation and protection
• C. Type II is noncombustible with insulation
• D. Type I has higher fire resistance rating

Answer: (B)

The key distinction is how the structural frame is protected from fire. Type I construction is fire-resistive: the structural elements are protected with fire-rated materials and assemblies, designed to maintain integrity for a specified period during a fire. Type II construction uses noncombustible materials for the structure, but the structural members themselves typically don’t require or receive the same fire-resistance rating or protective insulation as Type I. In other words, the structural components in Type II commonly lack the insulation and protective fireproofing that Type I frames have. That difference in protecting the core structural members is what sets the two types apart, making the statement about structural components lacking insulation and protection the most accurate descriptor of the main difference.

The key distinction is how the structural frame is protected from fire. Type I construction is fire-resistive: the structural elements are protected with fire-rated materials and assemblies, designed to maintain integrity for a specified period during a fire. Type II construction uses noncombustible materials for the structure, but the structural members themselves typically don’t require or receive the same fire-resistance rating or protective insulation as Type I. In other words, the structural components in Type II commonly lack the insulation and protective fireproofing that Type I frames have. That difference in protecting the core structural members is what sets the two types apart, making the statement about structural components lacking insulation and protection the most accurate descriptor of the main difference.