PA Energy Code PA Check

Existing Buildings

Unlike the 2009 IECC, the 2015 IECC includes a section (Chapter 5, Existing Buildings) clarifying that it is intended to apply to additions and major renovations in addition to newly constructed dwellings.  Pennsylvania has adopted this chapter in its entirety.

Editorial Comment:

The 2015 IECC requires testing to verify that whole envelope air leakage and duct leakage rates fall below specified thresholds.  This testing will be challenging to complete accurately when testing additions, where the leakage of the existing structure may affect the test results of the new components.  Successful implementation of the new existing building requirements will require a degree of cooperation and improvisation by builders, testing contractors, and code officials.


Home Addition Photo