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Mold Awareness

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A Brief Overview for Building Maintenance Rowan University Department of Environmental Health and Safety Mold Awareness * A brief overview of the issues that are ... – PowerPoint PPT presentation

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Title: Mold Awareness


1
Mold Awareness
  • A Brief Overview for Building Maintenance

2
Mold Overview
  • Wide variety of molds may be present in building
    materials
  • Common ones include
  • Alternaria
  • Aspergillus
  • Penicillium
  • Stachybotrys

3
Mold Overview
  • Fungi can be
  • Toxigenic
  • Pathogenic
  • Allergenic
  • Irritant
  • Some Fungi are beneficial and required for good
    health.
  • All effect individuals differently.

4
Mold Overview
  • Adverse effects
  • Runny nose, dermatitis and headaches to
    aggravation of asthma, allergic reactions and
    hypersensitivity pneumonitis.
  • Toxic effects have only been observed in
    laboratory settings. Indoor environments cannot
    present this level of exposure.
  • Exceptions-Silos, post disaster conditions,
    confined spaces

5
Mold Overview
  • Chronic Exposure
  • Claims of Memory Loss, Peripheral Neuropathy,
    Diminished Capacity, Loss of Consort, and many
    other significant illnesses
  • Medical Experts do not concur.
  • Would be unlikely to find all cases are unrelated.

6
Mold Overview
  • Actual fungal infection in construction is rare
    (e.g. aspergillosis, histoplasmosis)
  • Most infected persons have only minor symptoms
    and recover naturally
  • Small percentage of the population (_at_ 5) may
    suffer more severe infections
  • Persons usually have pre-existing condition that
    makes them susceptible (e.g. immune system
    impairment)

7
Mold Overview
  • Current medical tests can only document exposure
    to fungi has occurred.
  • Tests cannot determine source, place, or time of
    exposure.
  • Exposure to fungi occurs naturally in both the
    indoor and outdoor environments
  • Medical tests are of limited use.

8
The Role of Moisture
Moisture
Fungal
Nutrient
  • Mold needs water to grow
  • Liquid Water
  • Water Vapor impacting surfaces
  • Other growth requirements are met in every
    building
  • The only component that can be reasonably
    controlled is moisture

Spores
Temperature
9
Reasons for Mold Growth on Building Materials
  • Moisture accumulation mold growth
  • Design or construction flaws (improper vapor
    barriers, leaky roof, failure to provide drainage
    at foundation walls, etc)
  • Events such as pipe leaks or flooding
  • Failure to protect building materials in storage
    on job
  • Over air-conditioning
  • Modern, energy efficient buildings, appear more
    susceptible
  • Airtight construction inhibits drafts and airflow
    that dry out damp materials

10
Reasons for Mold Growth on Building Materials
  • Shipment of New Material may gather moisture.
  • Phasing of Project may allow new Material to be
    Exposed to Elements.
  • Once Installed, Possibilities Exist for
    Accidental Moisture Intrusion.

11
  • Obvious indicators of Microbial growth and
    Contamination are
  • Visible growth
  • Musty Odors resulting from
  • Active Growth
  • Digestion while degrading substrates

12
Water Damaged Materials
13
Water Damaged Materials
14
Water Damaged Materials
15
Water Damaged Materials
16
Water Damaged Materials
17
Assessing the Situation
  • New York City DOH Guidelines on Assessment and
    Remediation of Fungi in Indoor Environments
  • A visual inspection is the most important
    initial step in identifying a possible
    contamination problem.

18
Assessing the Situation
  • In most cases visual inspection will be
    sufficient to identify areas that require
    remediation.
  • Be sure all contaminated areas are identified.
  • In wallboard material mold growth may extend up
    to 1 meter beyond what is visible.
  • Inaccessible areas may be your largest concern
    Behind wallboard, under wallpaper, below rugs,
    etc.
  • A moisture meter can be useful in assessing
    porous materials that may be contaminated and
    should be disposed.

19
Assessing the Situation
  • Contractors frequently ask if sampling or air
    monitoring should be done
  • The New York DOH Guidelines state
  • Bulk or surface sampling is not required to
    undertake a remediation.
  • Air sampling for fungi should not be part of
    a routine assessment......decisions about
    appropriate remediation strategies can usually be
    made on the basis of visual inspection

20
Assessing the Situation
  • Currently there are no occupational exposure
    limits for fungi in the work place
  • ACGIH is steering clear of numerical values
  • Must put sampling in context indoor vs. outdoor
    concentrations, species diversity
  • If bulk or air monitoring is desired, an
    experienced professional should be retained
  • Viable vs. Non-viable Sampling
  • A laboratory accredited by the AIHA Environmental
    Microbiology Laboratory Accreditation Program
    (EMLAP) should analyze any samples

ACGIH 1999 Bioaerosols Assessment Control
21
Fungal Contamination During Construction or
Renovation
  • Contractors are aware of fungal problems from
    bird or bat droppings
  • Typically encountered during rehab of older
    buildings, especially those with attics
  • Increased likelihood that contractors may
    encounter moldy building materials
  • Materials include drywall, ceiling tiles,
    carpeting, etc.
  • Common during rehabilitation of historic
    buildings
  • Buildings subject to flooding or having poor
    drainage
  • Upgrading of buildings in use

22
Fungal Contamination During Construction or
Renovation
  • New Construction
  • Microbial Control Specifications being designed
    into more Construction Documents
  • Building Owners are placing burden on Contractor
    to control future microbial growth
  • Manufacturers are more aware of mold concerns

23
Remediation Guidelines
  • There are no federal regulations regarding mold
    remediation at this time.
  • NYC DOH are common guidelines
  • NADCA has extensive guidance
  • The most important action is to stop all sources
    of moisture and dry out materials as quickly as
    possible using fans and dehumidifiers.

24
Remediation Guidelines
  • Ozone air cleaners
  • Not recommended dont waste money!
  • A study by US EPA (EPA-600/R-95-154 Oct. 1995)
    demonstrated that ozone is not effective for
    killing airborne fungi even at high
    concentrations (6-9 ppm)
  • Ion Precipitators-Have not proven to be effective
  • Charcoal Filtration for odor control
  • Face velocity is nearly always too high for
    effective capture

25
Regulations
  • OSHA Regulations
  • Contractors should be aware of other OSHA
    regulations that may be triggered during a mold
    remediation project
  • 29CFR1926.103 - Respiratory protection
  • 29CFR1926.102 - Eye and face protection
  • 29CFR1926.59 - Hazard Communications
  • 29CFR1926.51 Sanitation
  • General Duty Clause!

26
Additional Information
  • Guidelines on Assessment and Remediation of Fungi
    in Indoor Environments
  • New York City Department of Health Bureau of
    Environmental Occupational Disease Epidemiology
  • Bioaerosols, Assessment Control (2nd Edition)
  • ACGIH
  • American Industrial Hygiene Association
  • Biosafety Committee
  • Environmental Microbiology Laboratory
    Accreditation Program

27
Additional Information
  • National Air Duct Cleaners Association
  • American Society for Heating, Refrigeration, and
    Air Conditioning Engineers
  • Internet SourcesEndless!
  • IIRC Guidelines- S500/S520
  • The Environmental Health and Safety Office
  • ehs_at_rowan.edu
  • x-5105
  • EHS Website-Concern Form

28
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