To receive maximum points under Indoor Environmental Quality Credit, Enhanced Garage Pollutant Protection, which single strategy should be used?

The LEED v4 for Homes and Multifamily rating system awards the maximum points for the IEQ Credit: Garage Pollutant Protection to projects with a detached garage or no garage. This strategy is considered the most effective because it physically separates the primary source of pollutants (e.g., vehicle exhaust, stored chemicals) from the home's conditioned living space. By eliminating the shared walls and direct pathways for contaminant entry, a detached garage provides the highest level of protection for indoor air quality, thus earning the full credit value without requiring additional measures like exhaust fans or enhanced sealing beyond standard construction.

A. Installing a garage exhaust fan is an enhanced strategy for an attached garage, but it earns fewer points than the complete separation provided by a detached garage.

B. Keeping HVAC systems out of the garage is a prerequisite for this credit, not a strategy that earns the maximum points on its own.

D. Providing a tight seal is the most basic requirement for an attached garage to earn any points under this credit; it does not yield the maximum available points.

1. U.S. Green Building Council. (2016). LEED v4 for Homes and Multifamily Reference Guide.

Page 361, IEQ Credit: Garage Pollutant Protection: The guide explicitly outlines the compliance paths. "Option 1: No Garage or Detached Garage (2 points)" is listed as the highest point-earning option. In contrast, "Option 2: Attached Garage (1 point)" requires sealing, no HVAC in the garage, and an exhaust fan. This confirms that a detached garage is the single strategy for maximum points.

2. University of Florida, Program for Resource Efficient Communities. (2014). LEED for Homes v4 & Other Green Building Programs.

Slide 101, "IEQ 5: Garage Pollutant Protection": This university courseware presentation clearly shows the point structure: "Option 1: No Garage or Detached Garage = 2 points" and "Option 2: Attached Garage = 1 point." This directly supports that a detached garage is the maximum point strategy.