3 Paths to 2015 IECC Energy Code Compliance

There is still confusion regarding the Energy Code Maine has adopted. In an effort to promote understanding, I have tried to summarize the different paths as simply as possible so that homeowners can understand.

Prescriptive path is by far the most common. Its easiest to think of this like a checklist. There are many parts of the checklist for energy efficiency items in buildings. For example, do I have R49 in the attic? Yes, Check. You are simply checking boxes for the required items in your climate zone.

The performance path differs slightly. It is calculated. All the assembly particulars in the building, (made up of various components like framing members, insulation, sheathing, finishes, windows, doors) along with HVAC are combined to give an overall energy performance. This is compared to a standard design number. If yours is equal to or better, regardless of if you have checked all your boxes from the previous path, your compliance with the energy code is met.

The ERI or Energy Rating Index is the most complex. It allows builders to demonstrate code compliance by achieving a specific energy efficiency score based on a comprehensive analysis of the building's design and systems. It is similar to the performance path but takes a much greater number of pieces of the home into account.