Building Technology and Systems
Integration over memorization
Technology questions reward candidates who understand how systems interact rather than isolated facts. Organize your knowledge into four layers: structure (load path, span, lateral resistance), envelope (heat, air, and moisture control), environmental systems (HVAC, plumbing, electrical), and life safety (egress, fire resistance, alarm). The examiner's favorite theme is the conflict: a beam that blocks a duct, a window detail that creates a thermal bridge, a ceiling that hides a sprinkler obstruction.
Concepts a candidate must command
- Load path continuity: gravity loads travel from slab to beam to column to foundation; lateral loads travel through diaphragms to shear walls or frames. Any discontinuity is a design defect.
- The four control layers of the envelope - water, air, vapor, thermal - and their correct order. Vapor retarders go on the warm side in heating climates; the assembly must be able to dry.
- Psychrometrics and equipment sizing: sensible versus latent load, and why oversizing causes short cycling and poor dehumidification.
- Fire and smoke behavior: compartmentation, protected egress, and the difference between fire resistance rating and flame-spread class.
- Coordination: clash detection between structural, mechanical, and architectural drawings before construction.
Traps
Questions often present a plausible-sounding fix that solves one problem while creating another - for example, adding a vapor barrier to stop air leakage, which then traps moisture. Watch for units (cfm versus cfm per person; R-value versus U-factor) and for the assumption that a bigger system is better. Also be alert to questions where the drawing is right but the sequence is wrong, such as installing the envelope after the structure is enclosed.
Worked rule of thumb
Use the "outside-in, warm-side" rule: water control goes outermost, then air, then vapor, then thermal, and the vapor retarder belongs on the warm side with a drying path to the cool side. For sizing, remember that latent load drives dehumidification - a system sized only for sensible load will feel clammy.