By James Dudt, PE, LEED AP BD+C
The compliance option you choose will impact every major aspect of your project: appearance, functionality, and cost.
Pennsylvania’s adoption of the 2015 International Energy Conservation Code (IECC) has brought some big changes to commercial building design and operation.
As you’d expect, the 2015 IECC decreases how much energy buildings can use. It touches on all the building components that affect energy use. Owners and design teams will see changes related to HVAC systems, lighting and controls, building envelope, and overall building operation.
Like Pennsylvania’s previous energy code, the 2009 IECC, the 2015 IECC provides three options for compliance. Unlike the previous code, though, the three compliance options contain some significant differences. Which compliance path you choose will impact every major aspect of your project: appearance, functionality, and cost.
This article gives an overview of the compliance paths, explains why they matter, and offers some thoughts on how to choose the right compliance path for your project.
To meet the code, the design needs to follow one of three compliance options (see C401.2).
2015 IECC's Three Compliance Options
As mentioned earlier, the compliance options in Pennsylvania’s previous energy code (2009 IECC) ran parallel to one another, since ASHRAE 90.1-2007 and the 2009 IECC did not have major differences.
With the 2015 IECC, though, the compliance paths have some significant differences. Those differences have cost, design, and operational impacts.
The compliance path you choose affects the overall direction the project will take:
All of this, in turn, affects what needs to be included in the project budget.
The owner and design team need to decide early what’s important to the project – whether that’s lots of daylight, long-term operating costs, first cost, sustainability, etc. A team might ask: How important is the amount of glass? How will certain code requirements (e.g., receptacle control) affect the people using the space? How important are high-efficiency HVAC systems for long-term operational savings?
When the team knows what’s important to the project, they can evaluate the compliance options to see if one path is more appropriate than another.
For example, if the exterior appearance of the building is a priority, especially in terms of glazing, Option 3 is likely to suit the project best. But if the project is an interior renovation, Option 2 might provide all the flexibility the owner and design team need.
If the project is pursuing LEED, the team may want to follow Option 1 (ASHRAE 90.1-2013) so that they don’t miss any of ASHRAE 90.1-2010’s mandatory provisions. Otherwise, the team may overlook project requirements as they try to meet two codes for two purposes. If the project is not pursuing LEED, owners and design teams might find it hard to justify spending budget dollars on Option 1’s additional system requirements, especially if they don’t think they’ll take advantage of those systems (e.g. advanced electrical energy monitoring).
Choosing a compliance path isn’t a one-size-fits-all approach, and not all the code options and trade-offs apply to every type of project.
The energy code is demanding more of building performance and, by extension, owners and design teams. Today, meeting the energy code requires a higher level of coordination among the owner, architect, engineers, and other members of the design team. To avoid redesigns, budget issues, and compliance conflicts, teams need to decide what compliance option to follow, and decide early.
James Dudt, PE, LEED AP BD+C, is a principal of Karpinski Engineering. He engages with clients through the lifecycle of a project, and he leads KE’s Pittsburgh team. James is known for his responsiveness and persistence, whether he’s managing projects or pursuing new opportunities. More about James.
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