Which construction type would be most appropriate for a 20-story office building?
Correct Answer
C) Steel or concrete frame
Why this is correct: A 20-story building is a high-rise structure requiring a frame that can support immense loads over many floors and provide necessary fire resistance. Steel frame or reinforced concrete frame construction meets these requirements for strength, flexibility, and code compliance. Why the other choices are wrong: 'Masonry bearing walls' are typically limited to mid-rise buildings due to load-bearing constraints. 'Wood frame throughout' is used for low-rise residential and lacks the strength and fire rating for 20 stories. 'Mixed wood and masonry' is also unsuitable for a high-rise office building. Exam tip: High-rise = steel or concrete frame. This is a fundamental construction classification.
Why This Is the Correct Answer
Steel frame and reinforced concrete construction provide the necessary structural strength to support the massive loads of a 20-story building, including dead loads, live loads, and wind loads. These materials offer superior fire resistance ratings required by building codes for high-rise structures, typically providing 2-4 hour fire ratings. The engineering properties of steel and concrete allow for the long spans and vertical load distribution essential for tall office buildings. Building codes specifically mandate these construction types for structures exceeding certain heights due to safety and structural integrity requirements.
Why the Other Options Are Wrong
STEEL RISES High
STEEL RISES: Steel and Reinforced concrete are the only materials that can safely RISE to Significant heights (high-rise buildings). Remember that when buildings go UP, you need materials that won't give UP - steel and concrete.
How to use: When you see any question about tall buildings (typically 10+ stories), immediately think 'STEEL RISES' and look for steel frame or reinforced concrete options while eliminating wood and basic masonry choices.
Exam Tip
Look for height indicators in the question - any building over 6-8 stories will typically require steel or concrete construction, while 1-4 story buildings might use various construction types.
Common Mistakes to Avoid
- -Confusing masonry veneer with structural masonry bearing walls
- -Not considering building code height restrictions for different construction types
- -Overlooking fire resistance requirements that mandate certain construction types for tall buildings
Concept Deep Dive
Analysis
This question tests understanding of construction types and their appropriate applications based on building height, load requirements, and safety codes. Construction type selection is critical in real estate appraisal as it affects building cost, durability, functionality, and market value. Different construction methods have specific limitations regarding height, fire resistance, and structural capacity that appraisers must understand to properly evaluate buildings. The relationship between construction type and building use/height is fundamental to understanding building quality and replacement cost estimation.
Background Knowledge
Building construction types are classified based on materials and methods used, with each type having specific height limitations, fire resistance ratings, and structural capabilities. Understanding these classifications is essential for appraisers to properly assess building quality, estimate replacement costs, and understand market acceptance of different property types.
Real-World Application
When appraising office buildings, construction type directly impacts replacement cost estimates, with steel and concrete construction being significantly more expensive per square foot but necessary for tall buildings, affecting both the cost approach valuation and market comparability analysis.
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