Frequently Asked Questions (FAQs)

Topics - lighting - Residential

The 2009 IECC requires that a minimum of 50% of the lamps in permanently installed lighting fixtures be high-efficacy lamps (2009 IECC, Section 404.1). The 2012 IECC has increased the minimum percentage from 50% to 75%, along with an exception for...

Topics - Commercial - Residential - status of state energy codes

Code adoption takes place at the state, and in some cases municipal, level. To determine the code in a particular state, visit the Status of State Energy Code Adoption page.

Topics - addition - alteration - building envelope - Residential

REScheck determines compliance for additions in the same manner as new construction. When entering an addition, only the new portions of the building need to be shown in the software. REScheck will perform trade-offs between envelope assemblies when...

Topics - Commercial - Residential - code

The IECC addresses mixed occupancies by stating that commercial occupancies must comply with the commercial portion of the code and...

Topics - Residential - building

The term “residential building” includes:detached one-or-two family dwellings having not more than three stories above grade plane; buildings that consist of three or more attached townhouse units and have not more than three stories...

Topics - walls - Residential

REScheck uses nominal insulation R-values. The program does not calculate for compression. For example, if R-19 is entered as the cavity insulation R-value, it assumes the full R-19 in REScheck. Walls with insulation R-values equal to or less than R...

Topics - Commercial - Federal - Manufactured Housing - Multi-Family - Municipal - Residential

Copies of the International Energy Conservation Code (IECC) can be purchased from the International Code Council website. Copies of ASHRAE standards can be purchased from the ...

Topics - air leakage - mechanical - ducts - Residential - duct testing - testing

Both the 2009 and 2012 IECC require duct tightness to be verified. Verification can take place via either a post-construction test or a rough-in test.For the post-construction test, leakage measurement must be made across the entire system,...

Topics - building envelope - basement - walls - Residential

After selecting a basement wall type, a basement wall illustration will appear with input boxes for the basement wall height, depth below grade, and depth of insulation. The illustration helps identify the dimensions being requested. You may enter...

Topics - building envelope - walls - Residential

Walls that do not fit into any of the preset categories in REScheck (preset categories come directly from the applicable code currently selected in the Code menu) may be entered under the "Other" wall type. When "Other" is chosen as the wall type,...