ASHRAE Journal - August 2014 - 88

Column Iaq applIcatIons

* Inclusion of additional alternate compliance paths,
particularly for use in existing buildings.
* Addition of requirements for low humidity limits.
* Improvements to the natural ventilation procedure.
* Further improvements to DCV requirements.
One exception to the theme of "improving the details
of the standard" is Addendum 62.1a. This addendum will
change the scope of the standard. Currently Standard
62.1 covers all buildings except residential buildings three
stories high or less. Standard 62.2 covers single family
houses and multifamily buildings up to three stories. The
two standards result in significantly different requirements between multifamily buildings that are three (62.2)
or four (62.1) stories tall. More significantly, Standard
62.2 has an appendix that provides alternative compliance methods for existing buildings. This appendix is
heavily used by residential weatherization programs.
When residences are weatherized under these programs,
compliance with Standard 62.2 is often required to
assure that measures do not compromise the IAQ in the
homes. Standard 62.1 has no corresponding method to

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allow existing buildings to show compliance other than
by meeting all of the requirements intended for new
construction. This placed weatherization programs in the
difficult position of applying Standard 62.2 outside of its
scope or not applying an IAQ standard when weatherizing
multifamily dwelling in buildings taller than three stories.
Addendum 62.1a and a corresponding addendum to
Standard 62.2 will change the scopes of both standards
such that single family homes and dwelling units in multifamily buildings, regardless of height, will be covered
by Standard 62.2 while the common areas of multifamily
buildings will be covered by Standard 62.1. This will allow
weatherization programs to apply the existing building
appendix of 62.2 to any residential building. It also has the
benefit of providing uniform ventilation requirements
for all apartments, regardless of the height of the building in which they are located. It also will clarify coverage
of mixed use buildings of three stories or less. Currently,
it is unclear which standard covers a building with retail
on the first floor and apartments on the second and third
floor. The current scope language for both standards
defines coverage by building. The proposed scope change
will explicitly determine coverage at the zone level.
This change in scope is not expected to have major
impacts in other areas of the standard. It will, however,
have a significant impact on users. Nearly all multifamily residential buildings will need to comply with both
Standards 62.1 and 62.2. It is unclear how future standards will fit with the model codes that are a primary
user of the standards. There will also be impacts on
LEED, where compliance with ventilation standards is
a prerequisite for certification. Finally, Standards 90.1
and 189.1 have similar scope as the current 62.1, and
the scope of 90.2 is similar to that of 62.2. The proposed
changes will impact this symmetry.
SSPC 62.1 is focused on improving the usability of
Standard 62.1, while providing flexibility to building
designers. The tension between providing acceptable
indoor air quality and reducing energy consumption is a
never ending issue. SSPC 62.1's primary goal is to assure
that building occupants are provided with acceptable
indoor air quality, but we are open to changes that allow
energy savings but don't compromise IAQ. The SSPC
welcomes change proposals from ASHRAE members and
the public. See "How to Submit a Proposed Change to a
Standard" at www.ashrae.org/standards-research-technology/standards-forms-procedures.

ASHRAE Journal - August 2014

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