As of July 1, the 2012 IECC is in effect in the state of Maryland. Most counties have adopted the code through their regular building code adoption process, however, some counties have not formally adopted the code. Regardless of whether or not a jurisdiction is enforcing the new code, builders applying for building permits after July 1 should be prepared to build to the 2012 IECC.
If you have any questions, please contact the local building code official listed below for each jurisdiction, or call HBAM at (410) 265-7400.
2012 IECC Training in Howard County
Howard County is offering a free 2012 IECC Training on August 21, 2012. The class is only open to 150 participants, so you need to register ASAP. It will be taught by an ICC Certified Instructor. For more information and to register, click the following links:
Total duct leakage testing is mandatory unless HVAC equipment and ducts are within the thermal envelope. The following table shows the 2012 requirements compared to the 2009 IECC.
Total Duct Leakage
25 CFM per 100 sqft CFA
Rough-In if air handler not yet installed
Duct Leakage is measured in cubic feet per minute (CFM) at a pressure of 25 Pascals for every 100 sq.ft. of conditioned floor space (CFA).
The 2012 IECC requires ALL homes be tested for air leakage with a blower door test. In Maryland, air leakage cannot exceed 3 air exchanges per hour at 50 Pascals.
It is important to note that many county's in the HBAM area are interpreting this requirement slightly different because of rounding decimal places, so be sure and check with your local building code official to find out what will be accepted. For instance, some counties will only accept 3.0 and less, some are accepting 3.5 and less, and at least one is going so far as accepting 3.99 or less.
Hot Water Piping
Hot water piping must be insulated to at least R-3 if the piping falls into one of the following groups:
Piping is larger than 3/4" in nominal diameter,
Piping serves more than one dwelling unit,
Piping runs from water heater to kitchen outlets,
Piping is located outside of conditioned space,
Piping runs from water heater to a distribution manifold,
Piping is located under a floor slab,
Piping is buried,
Supply and return Piping is in recirculation systems other than demand recirculation systems, and
Piping run lengths exceed the following maximum run lengths for a nominal pipe diameter:
Nominal Diameter of largest pipe diameter in run
Max Run Length
75% of lighting fixtures must be energy efficient. This is an increase from 50% in the 2009 IECC.
Builders must complete and post this certificate sticker on the electric panels of every home. Most counties will give them out for free at permit application, however some counties will charge you. This sticker will show results from duct system and air leakage tests in addition to insulation R-values, fenestration U-factors & SHGCs, and heating type and efficiency.
Each County in the HBAM area is developing its own compliance checklist and forms. Here are the important documents for each county as well as contact information if you have questions about the code: