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Restoring Flooded Buildings. Kenneth Hellevang, Ph.D., P.E. Extension Engineer and Professor North Dakota State University Fargo, ND. Initial Steps. Use personal protective equipment Gloves, boots, eye and respiratory protection Shut off electricity if there is water on the floor

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restoring flooded buildings
Restoring Flooded Buildings

Kenneth Hellevang, Ph.D., P.E.

Extension Engineer and Professor

North Dakota State University

Fargo, ND

initial steps
Initial Steps
  • Use personal protective equipment
    • Gloves, boots, eye and respiratory protection
  • Shut off electricity if there is water on the floor
  • Shut off gas if heating system has been affected
  • Check for structural damage
  • Document damage
  • Contact insurance agent
remove water slowly
Remove Water Slowly
  • Remove 2 to 3 feet of water from the basement
  • Wait 24 hrs, if the water level rises, wait 24 hrs.
  • Remove another 2 to 3 feet
  • Continue process until water is removed.
water damage restoration
Water Damage Restoration
  • IICRC S500 Standard and Reference Guide for Professional Water Damage Restoration Third Edition 2006
    • Institute of Inspection Cleaning and

Restoration Certification

      • Authored by application and technical experts
categories of water
Categories of Water
  • Clean Water – Category 1
    • Broken water pipes, rainwater, etc
  • Gray Water – Category 2
    • Contains contamination & microorganisms
    • Toilets with urine,sump pump,dishwashers
  • Black Water – Category 3
    • Contains pathogenic agents
    • Sewage, surface water flooding, pesticides
contaminated water restoration
Contaminated Water Restoration
  • Dispose
    • carpet cushion
    • absorbent stuffed fabrics
    • Saturated absorbent materials
      • Ceiling tile, dry wall, paper, etc.
  • Evaluate structural materials for degree of contamination and physical damage
contaminated water restoration7
Contaminated Water Restoration
  • Discard carpet saturated with category 3 water
  • Category 2 water carpet contamination may be cleaned with hot water extraction and biocide
  • Remove floor if water reached subflooring
    • Subflooring must be cleaned, disinfected, dried
remove mud
Remove Mud
  • Shovel out wet mud
  • Flush non-porous surfaces with water
  • Clean non-porous walls starting at the bottom or where damage is worst
  • Clean then disinfect
biocide
Biocide
  • Must be used according to label (specific application)
    • The label is the law
  • Must be applied to clean surface
  • Must have required exposure time
  • Must use PPE
  • Ventilate the area
  • Common biocides
    • Alcohol, sodium hypochlorite (chlorine bleach), hydrogen peroxide, iodine, quaternary ammonium chloride, synthesized phenolic compound
electrical
Electrical
  • All electrical fixtures (switches, outlets, breakers, wire) submerged in flood water need to be replaced.
  • Electrical motors will need to be professionally reconditioned.
  • Contact an electrician or an electrical inspector.
health effect
Health Effect

Scientific evidence links mold and other factors related to damp conditions in buildings to:

  • Asthma symptoms in those with the chronic disorder
  • Coughing, wheezing, and upper respiratory symptoms in otherwise healthy individuals
  • Hypersensitivity Pneumonitis in susceptible people
  • Lower respiratory illness in children

Institute of Medicine of the National Academies 2004

canadian department of health
Canadian Department of Health
  • Mold cell walls contain a compound with inflammatory properties
  • Mold spores and mycelial fragments contain allergens
  • Exposure to indoor mold is associated with an increased prevalence of asthma-related symptoms such as chronic wheezing, irritative, and non-specific symptoms

http://www.ec.gc.ca/CEPARegistry/notices/NoticeText.cfm?intNotice=400&intDocument=2692

March 12, 2007

respiratory protection
Respiratory Protection
  • Respirators
    • Minimum
      • N-95 respirator or mask
    • Proper fit
    • Labored breathing
eye protection
Eye Protection
  • Goggles must prevent entry of dust and small particles
guidelines and recommendations
GUIDELINES AND RECOMMENDATIONS
  • The Institute for Inspection, Cleaning, and Remedial Certification (IICRC) IICRC S520

“Standard and Reference Guide for Professional Mold Remediation”

  • EPA Remedial Guidelines
    • www.epa.gov
  • http://www.extension.org/
  • EDEN – the Extension Disaster Education Network
removal of mold contamination
REMOVAL OF MOLD CONTAMINATION

People react to active, dormant and dead mold - Biocides are not adequate!

  • Porous Materials

(ceiling tiles, carpeting, upholstered furniture, wallboard)

    • Remove and replace
  • Non-porous surfaces
    • Vacuum with HEPA filters
    • Wash with a detergent solution
    • Sanitize with a biocide if desired
    • Thorough drying
  • Semi-porous (floor joist, sill plates)
    • Remove mold, HEPA filter, biocide, dry
structural drying
Structural Drying
  • Open enclosed areas (walls, floors)
  • Reduce indoor relative humidity to <40%
  • Ambient temperature <72°F
  • Circulate air across drying surfaces
  • Drying may take several days or longer
  • Monitor with moisture meters
  • Monitor relative humidity
acceptable moisture level
Acceptable Moisture Level
  • Material type affects potential for mold growth
  • Wood moisture >15% may lead to mold growth
  • Relative humidity >70%

Do not enclose wet/damp materials

rebuilding
Rebuilding
  • Vinyl or ceramic tile flooring

Dry floor under vinyl

rebuilding22
Rebuilding
  • Wood

Air moves from stud wall cavity into living space

test for water vapor movement
Test for Water Vapor Movement
  • Clear plastic taped to surface
    • Watch for several days
    • Moisture accumulation indicates problem
  • Basement wall or floor

http://www.rd.com/64970/article64970.html

crawl space
Crawl Space

Dry soil

Place plastic

Ventilate?

air cleaners
Air Cleaners
  • Filters remove only some spores & do not remove proteins or VOCs
  • Ozone units should not be used in an occupied space and are not effective!
slide27

Search for NDSU Flood Information

http://www.ag.ndsu.edu/disaster/flood.html