Denver, Boulder and Vail have already done it. Glenwood Springs, Carbondale, Basalt and Aspen will do it soon. But starting today, September 6th 2016, all building permit applications submitted in Pitkin County must demonstrate compliance with the 2015 IECC (International Energy Conservation Code). Eagle County has postponed implementation of the codes until the start of the new year. This will give them time to train staff and educate local architects and builders on upcoming changes. That sounds smart to me, because the changes are not insignificant.
What’s new in the 2015 Energy Code?
Building Department reviews will be looking for new kinds of information on Construction Documents. Drawings will need to tell the story of how a building will be built to conserve energy; insulation, lighting, heating, cooling, moisture management and indoor air quality. Some jurisdictions are requiring that all IECC information be put on it’s own “energy” sheet.
The maximum allowed infiltration rate has decreased to 3 ACH50 and testing is mandatory. The 2009 limit of 7 ACH50 was easy; 3 ACH50 can be a challenge.
Mechanical ventilation is now mandatory. Plan on a HRV (or ERV if you have air conditioning) or some kind of exhaust-only ventilation.
Mechanical systems must be sized with ACCA Manuals J, S & D.
Prescriptive insulation values have crept up a bit in some categories. Chart shows new 2015 values in red.
For designer and builders using the prescriptive method of compliance, this means no more 12″ vented roofs. And in zones 6 & 7, no more walls without exterior continuous insulation.
If you want or need to break any of these rules, then you need to choose another compliance path. Using one of the performance path methods (REScheck, COMcheck, HERS Ratings, etc) will make the code easier and more flexible.
Confluence Architecture & Sustainability can help you with all of these facets; from submittal documents to blower door testing. We can help you find the least expensive way to satisfy the building department and inspector, or we can help you design a high-performing net-zero building. Give us a call…