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ASHRAE STD 160

Criteria for Moisture-Control Design Analysis in Buildings

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Organization: ASHRAE
Publication Date: 30 November 2016
Status: inactive
Page Count: 8
scope:

FOREWORD

This addendum revises Sections 6.1 and 7.5 as indicated below. Since the publication of Standard 160-2009, it has become apparent that the performance evaluation criteria for mold growth are too stringent. Section 6.1 currently prescribes a simplified criterion that is easy to calculate but difficult to meet: a flat 80% 30-day running average surface relative humidity criterion, bounded by temperatures between 5°C (41°F) and 40°C (104°F). A number of researchers and practitioners have reported to the committee that assemblies that are known to have satisfactory performance in reality are failing the criterion in simulation. Furthermore, the scientific literature indicates that mold growth requires a much more complex description. Mathematical models have been developed that predict mold growth risk as a function of time, surface temperature, and surface relative humidity. Such models can readily use as inputs the hourly outputs of a hygrothermal simulation. The mold growth model selected for implementation in Section 6.1 of Standard 160 by this addendum is empirical and has been validated with experimental data for different materials with varying sensitivities to mold growth. This addendum will bring the standard more in line with the current state of knowledge about mold growth while providing a less stringent criterion. Changes to Section 7.5 bring the reporting requirements in line with the changes to Section 6.1.

Note: In this addendum, changes to the current standard are indicated in the text by underlining (for additions) and (for deletions) unless the instructions specifically mention some other means of indicating the changes.

Document History

ASHRAE STD 160
November 30, 2016
Criteria for Moisture-Control Design Analysis in Buildings
FOREWORD This addendum revises Sections 6.1 and 7.5 as indicated below. Since the publication of Standard 160-2009, it has become apparent that the performance evaluation criteria for mold growth...
July 31, 2016
Criteria for Moisture-Control Design Analysis in Buildings
A description is not available for this item.
January 1, 2016
Criteria for Moisture-Control Design Analysis in Buildings
This standard applies to the design of new buildings and to the retrofit and renovation of existing buildings. This standard applies to all types of buildings, building components, and materials....
October 2, 2012
Criteria for Moisture-Control Design Analysis in Buildings
A description is not available for this item.
June 23, 2012
Criteria for Moisture-Control Design Analysis in Buildings
FOREWORD SSPC 160 changes Section 4.6 as indicated below. The changes are limited to Table 4.6.1 and the explanation of terms directly below the table. The changes are meant to simplify the...
January 29, 2011
Criteria for Moisture-Control Design Analysis in Buildings
FOREWORD In this addendum, the three required conditions for minimizing mold growth are modified by retaining only the most significant condition while eliminating the other two. This change has...
July 15, 2009
Criteria for Moisture-Control Design Analysis in Buildings
A description is not available for this item.
January 24, 2009
Criteria for Moisture-Control Design Analysis in Buildings
This standard applies to the design of new buildings and to the retrofit and renovation of existing buildings. This standard applies to all types of buildings, building components, and materials....
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