Standpipe stairwells must be what type of construction?

• A. Noncombustible fire-rated stairwells
• B. Combustible stairwells
• C. Glass stairwells
• D. Wooden stairwells

Answer: (A)

Standpipe stairwells must be enclosed in noncombustible, fire-rated construction to keep the escape path and firefighting access intact during a fire. The fire rating indicates how long the enclosure can resist heat and flame, helping prevent collapse, limit heat and smoke transfer, and maintain a safe route for occupants and crews for the duration required by code. Using noncombustible materials means the enclosure won’t add fuel to the fire or burn away, which is crucial for maintaining integrity under fire conditions. Common noncombustible options include concrete, masonry, and steel, while combustible choices would jeopardize safety, and glass or wooden stairwells are not appropriate due to poor fire performance and structural failure under heat.