Codes and Standards
What the exam expects
Codes and standards questions test whether you know which document governs which building type, which edition applies, and which compliance path is being used. The most common commercial energy code is ASHRAE Standard 90.1, while the IECC contains residential and commercial provisions. ASHRAE 90.1 has prescriptive and whole-building performance paths; Appendix G defines the performance rating method used for beyond-code and green-building modeling. Know the companion standards: 62.1 ventilation, 55 thermal comfort, 100 existing buildings, 211 commercial energy audits, and 189.1 high-performance green buildings. Local adoption controls; the latest edition is not automatically law.
Traps
Questions often mix baseline and proposed designs, treat plug and process loads inconsistently, or assume renewable energy can offset any end use. Another trap is confusing a stretch code with the base code, or citing a standard as a code without jurisdiction adoption. Watch whether a requirement is mandatory, prescriptive, or a trade-off.
Worked example
A 1,000 ft2 wall has U-0.10 versus a required U-0.08. Excess UA = 1,000 x (0.10 - 0.08) = 20 Btu/h-F. Improving 2,000 ft2 of roof from U-0.05 to U-0.04 saves 2,000 x 0.01 = 20 Btu/h-F, so the envelope trade-off is neutral on a UA basis. That arithmetic does not guarantee compliance; the approved performance path and all mandatory provisions still apply.