California IDEX Practice Exam 2025 – Comprehensive Test Prep

The correct choice is based on the classification of building types according to the International Building Code (IBC) and their fire-resistive construction requirements. Type V construction is the least restrictive regarding fire-resistance, allowing for the use of combustible materials like wood for both structural and non-structural elements. This makes it more versatile and affordable for builders, particularly for residential structures.

In contrast, Type I construction features non-combustible materials and requires greater fire resistance, making it appropriate for high-rise and critical buildings. Type II construction also requires non-combustible materials but allows limited use of combustible materials in certain applications, thus imposing stricter guidelines than Type V.

Type IV, often referred to as heavy timber construction, allows for wood use but has specific requirements regarding the size and treatment of the timber to enhance fire resistance compared to Type V. Each of these types reflects an increasing level of fire safety measures, with Type V allowing for the least amount of restriction, catering primarily to smaller or less critical structures.