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Mold and Moisture

Mold Remediation in Schools and Commercial Buildings

Table 1: Water Damage - Cleanup and Mold Prevention

Table 1 presents strategies to respond to water damage within 24-48 hours. These guidelines are designed to help avoid the need for remediation of mold growth by taking quick action before growth starts. If mold growth is found on the materials listed in Table 1, refer to Table 2 for guidance on remediation. Depending on the size of the area involved and resources available, professional assistance may be needed to dry an area quickly and thoroughly.

An Adobe Acrobat PDF version of this table is available here (PDF, 1 page, 209 K, about PDF)

Go to Table 2 | Go back to Investigating, Evaluating, and Remediating Moisture and Mold Problems

Water-Damaged Material Actions
Books and papers
  • For non-valuable items, discard books and papers.
  • Photocopy valuable/important items, discard originals.
  • Freeze (in frost-free freezer or meat locker) or freeze-dry.
Carpet and backing - dry within 24-48 hours §
  • Remove water with water extraction vacuum.
  • Reduce ambient humidity levels with dehumidifier.
  • Accelerate drying process with fans.
Ceiling tiles
  • Discard and replace.
Cellulose insulation
  • Discard and replace.
Concrete or cinder block surfaces
  • Remove water with water extraction vacuum.
  • Accelerate drying process with dehumidifiers, fans, and/or heaters.
Fiberglass insulation
  • Discard and replace.
Hard surface, porous flooring § (Linoleum, ceramic tile, vinyl)
  • Vacuum or damp wipe with water and mild detergent and allow to dry; scrub if necessary.
  • Check to make sure underflooring is dry; dry underflooring if necessary.
Non-porous, hard surfaces
(Plastics, metals)
  • Vacuum or damp wipe with water and mild detergent and allow to dry; scrub if necessary.
Upholstered furniture
  • Remove water with water extraction vacuum.
  • Accelerate drying process with dehumidifiers, fans, and/or heaters.
  • May be difficult to completely dry within 48 hours. If the piece is valuable, you may wish to consult a restoration/water damage professional who specializes in furniture.
Wallboard
(Drywall and gypsum board)
  • May be dried in place if there is no obvious swelling and the seams are intact. If not, remove, discard, and replace.
  • Ventilate the wall cavity, if possible.
Window drapes
  • Follow laundering or cleaning instructions recommended by the manufacturer.
Wood surfaces
  • Remove moisture immediately and use dehumidifiers, gentle heat, and fans for drying. (Use caution when applying heat to hardwood floors.)
  • Treated or finished wood surfaces may be cleaned with mild detergent and clean water and allowed to dry.
  • Wet paneling should be pried away from wall for drying.

* If mold growth has occurred or materials have been wet for more than 48 hours, consult Table 2 guidelines. Even if materials are dried within 48 hours, mold growth may have occurred. Items may be tested by professionals if there is doubt. Note that mold growth will not always occur after 48 hours; this is only a guideline.

These guidelines are for damage caused by clean water. If you know or suspect that the water source is contaminated with sewage, or chemical or biological pollutants, then Personal Protective Equipment and containment are required by OSHA. An experienced professional should be consulted if you and/or your remediators do not have expertise remediating in contaminated water situations. Do not use fans before determining that the water is clean or sanitary.

† If a particular item(s) has high monetary or sentimental value, you may wish to consult a restoration/water damage specialist.

§ The subfloor under the carpet or other flooring material must also be cleaned and dried. See the appropriate section of this table for recommended actions depending on the composition of the subfloor.

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