Occupancy and Construction Types
The Construction Type Matrix
Construction types (commonly I through V, with A and B subtypes) describe the combustibility and fire-resistance of the structural elements. Type I is noncombustible with the highest fire resistance; Type V is combustible with the least. The exam tests whether you can match a construction type to an occupancy group and allowable height and area. The controlling concepts are allowable building height in stories and feet, allowable floor area, and fire-resistance ratings of structural members.
Height and Area Adjustments
Allowable height and area are not fixed - they can be increased by frontage (open space around the building), by sprinkler protection, and sometimes by occupancy separation. Traps abound: a candidate may correctly recall a base area but forget the sprinkler increase, or apply a frontage increase without confirming that the open space is on a public way or an approved yard. Another trap is confusing building height with story count - both are limited, and they are measured differently.
Worked Example / Rule of Thumb
Rule of thumb: for any height/area question, work in this order - (1) identify occupancy group, (2) identify construction type, (3) find the base allowable height and area, (4) apply sprinkler and frontage increases only if the stem confirms them. If the stem says "fully sprinklered," the increase likely applies; if it is silent, do not assume it. This sequence prevents the most common error of skipping a step.
Exam Strategy
Never assume a feature (sprinklers, open frontage) that the stem does not state. The exam rewards disciplined, stepwise application over pattern matching.