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EPA Moisture Control Guide 2013

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www.epa.gov/iaq/moisture Table 4-1 Troubleshooting Common Indoor Water Problems SYMPTOMS Mold growth MOISTURE PROBLEM Leaks in the building enclosure due to problems with rain and groundwater controls POTENTIAL CAUSES DESIGN Missing or poorly designed details CONSTRUCTION Missing flashing or building wrap O&M Failure to identify and repair settled grading near foundation Incorrect sloping Damaged sub-grade drainage Damaged flashing on rooftop air handler curb Missing shingles Air conditioning equipment Failure to properly wire oversized humidity sensors Chilled-water temperature set-point too warm Air conditioning equipment not designed for sufficient dehumidification at design and part load Insufficient dehumidification by HVAC system(a) Economizer set-point that allows introduction of humid outdoor air Continuously running air handler regardless of cooling demand Condensation on dirty surfaces inside HVAC systems Failure to clean HVAC system cooling coils Air handler inside surfaces insulated or hard to clean Wet materials enclosed in building assemblies Poor condensate drain design Clogged drain pan Moisture-sensitive materials shown touching porous materials that are likely to get wet No values for moisture content or emission given in the specifications Peeling paint Wood decay Corrosion Leaks in the building enclosure due to problems with rain and groundwater controls Missing or poorly designed details Flooring placed on slab while it is too damp Vapor emission tests on slab may not have been conducted Missing flashing or building wrap Failure to seal penetrations during maintenance, repair or installation of new equipment Failure to identify and repair settled grading near foundation Incorrect sloping Damaged sub-grade drainage Damaged flashing on rooftop air handler curb Missing shingles Plumbing leaks and spills Improper design Improper installation during construction Improper operations and maintenance practice Water travels to materials that cannot tolerate wetting Capillary action (water wicks through porous building materials such as concrete or wood) Locating water lines in a space that reaches freezing temperatures Poorly designed shower pan Moisture barrier omitted from building design Drainage layer beneath slab omitted from building design 88 Defective pipe joining Accidental penetration of pipe by one or more drywall screws Moisture barrier not installed during construction Drainage barrier not installed during construction Failure to inspect plumbing and repair problems

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