CDT - Construction Documents Technologist Building Codes & Standards 1 — Questions and Answers
Question 1: Which building code classification system is used to determine the minimum fire-resistance rating required for structural elements based on building use and size?
- Occupancy classification under the IBC (Correct answer)
- Zoning ordinance designation
- ASTM material grading system
- ASHRAE energy compliance pathway
Correct answer: Occupancy classification under the IBC
The IBC assigns every building an occupancy classification (A, B, E, F, H, I, M, R, S, U) that directly determines fire-resistance ratings, allowable floor area, building height, and required means of egress.
Question 2: What is the primary purpose of a building's 'construction type' classification under the IBC?
- To establish allowable building height and area based on the combustibility and fire-resistance of structural materials (Correct answer)
- To set minimum plumbing fixture counts for occupants
- To define the exterior architectural style permitted by local zoning
- To specify the energy efficiency requirements for mechanical systems
Correct answer: To establish allowable building height and area based on the combustibility and fire-resistance of structural materials
IBC Table 601 assigns fire-resistance ratings to structural elements based on construction type (I through V), and Tables 503–506 use that type to establish maximum allowable height and floor area.
Question 3: Under the Americans with Disabilities Act (ADA) Standards for Accessible Design, what is the minimum clear width required for an accessible route?
- 32 inches
- 36 inches (Correct answer)
- 44 inches
- 48 inches
Correct answer: 36 inches
The ADA Standards (section 403.5) require accessible routes to have a minimum clear width of 36 inches, though passing spaces of 60 inches are required at intervals where two wheelchairs cannot otherwise pass.
Question 4: Which ASTM standard is commonly referenced in construction documents to specify fire-resistance ratings obtained through testing of assemblies such as walls, floors, and roofs?
- ASTM E84 — Standard Test Method for Surface Burning Characteristics
- ASTM E119 — Standard Test Methods for Fire Tests of Building Construction and Materials (Correct answer)
- ASTM C90 — Standard Specification for Loadbearing Concrete Masonry Units
- ASTM A36 — Standard Specification for Carbon Structural Steel
Correct answer: ASTM E119 — Standard Test Methods for Fire Tests of Building Construction and Materials
ASTM E119 establishes the test method used to determine fire-resistance ratings (in hours) for wall, floor, roof, and column assemblies, and those ratings are referenced directly in IBC Table 601 and listed assemblies.
Question 5: In the context of the IBC, what does 'means of egress' consist of?
- Only the exit doors and exit discharge paths
- The exit access, the exit, and the exit discharge — three distinct components (Correct answer)
- Any corridor, aisle, or passageway leading to the outside
- The combination of fire-rated walls and sprinkler systems protecting occupants
Correct answer: The exit access, the exit, and the exit discharge — three distinct components
IBC Section 1003 defines means of egress as a continuous, unobstructed path comprising three parts: exit access (path to the exit), the exit itself (protected component such as an enclosed stair), and exit discharge (path from exit to a public way).
Question 6: Which organization publishes the model code that most U.S. jurisdictions adopt as the basis for their local plumbing code?
- International Association of Plumbing and Mechanical Officials (IAPMO) — Uniform Plumbing Code (Correct answer)
- National Fire Protection Association (NFPA)
- American Institute of Architects (AIA)
- Construction Specifications Institute (CSI)
Correct answer: International Association of Plumbing and Mechanical Officials (IAPMO) — Uniform Plumbing Code
The Uniform Plumbing Code (UPC), published by IAPMO, is one of the two primary model plumbing codes adopted across U.S. jurisdictions (the other being the International Plumbing Code published by ICC); CDT candidates must recognize both sources.
CDT - Construction Documents Technologist Building Codes & Standards 1
Which building code classification system is used to determine the minimum fire-resistance rating required for structural elements based on building use and size?