For the fist time in National Building Code history, Part 9: Energy Efficiency sets a minimum benchmark with Section 9.36. To achieve this, there are two optional compliance methods: Prescriptive or Performance.
The prescriptive approach allows the designer to “pick” appropriate envelope solutions from the tables and charts. There is provision made for limited trade-offs (i.e. increasing wall insulation to off-set limited u-value of stain glass custom window) whereas the performance option allows for the minimum efficiency target to be met through showing compliance through modelling (i.e. Hot2000). The performance path further allows the designer to take a more customized approach in meeting the minimum energy efficiency standard.read more