Frequently Asked Questions (FAQs)

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 ...

Category: walls

Spandrel glass should be entered as an "Other" wall type. The gross area of the wall and the overall U-factor of the assembly should be entered. Then the glazing area (overall area minus framing) can be entered with the same overall U factor. The...

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.

Any building that contains conditioned space must comply with either the IECC or ASHRAE Standard 90.1.The IECC exempts buildings with a peak design rate of energy use for space conditioning less than 3.4 Btu/h•ft2 from compliance with...

The IECC addresses mixed occupancies by stating that commercial occupancies must comply with the commercial portion of the code and residential occupancies must comply with the residential portion of the code.ASHRAE Standard 90.1 addresses only...

Category: building envelope

If multiple users are putting information into COMcheck, each may fill out the appropriate section independently. However, all sections of the building must show compliance to the same code or standard (e.g., cannot show envelope compliance to IECC...

Category: lighting

Exemptions and allowances for lighting are an option that must be activated in COMcheck. To activate the exemptions and allowances, take the following steps:Select either the Interior Lighting or Exterior Lighting Tab Go to the Options menu and...

Category: addition, alteration

COMcheck 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. COMcheck will perform trade-offs between envelope assemblies...

A performance approach (also known as a systems performance approach) allows you to compare your proposed design to a baseline or reference design and demonstrate that the proposed design is at least as efficient as the baseline in terms of annual...