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Mold from roof leaks

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How common is mold growth as a result of a roof leak?

  • Fortunately, roof leaks are fairly rare.  In some areas of the country, such as the Pacific Northwest, mold growth due to condensation is far more common.  

What does attic mold growth from a roof leak typically look like?

  • Roof leaks cause two types of mold growth; systemic or limited growth.  Systemic growth occurs when the roof leak causes enough moisture buildup in the attic to cause mold growth throughout the entire area.  In this case, the moisture buildup is indirect (the roof leak only effects a small area, but the dampness in the air causes condensation throughout.)  
  • Limited growth occurs when an attic has sufficient ventilation to exhaust the additional moisture caused by the roof leak.  In these cases, the mold remediation efforts can focus solely on the area surrounding the leak.

How are attic mold problems due to roof leaks properly addressed?

  • First, the roof leak itself must be remedied.  Typically this aspect is performed by a roofing contractor rather than a mold remediation contractor.  Most mold professionals are not licensed to perform roof repair.
  • Second, the current mold growth is killed with a fungicide.
  • Third, the attic is dried out, either using natural air flow or mechanical heating and dehumidification.
  • Fourth, the residual mold staining is treated with an encapsulant.
Ceiling Mold From Roof Leak

Recent Inspection Report Involving Mold from Roof Leaks

Inspection #: 202035

Reason for inspection:

  • City code enforcement has required assessment and remediation plan for mold growth prior to the commencement of remodeling.
  • Water damage and mold growth was noted in several areas throughout the home.
  • Indoor air quality testing revealed high levels of mold spores in the home.
Roof leak mold

Summary of concerns:

  • Water damage and mold growth was noted in several areas throughout the home.
  • Indoor air quality testing revealed high levels of mold spores in the home

Kitchen:

Summary: Abnormal Conditions Found!

Observations:

  • Increased moisture content in cabinetry below sink.
  • Mold growth noted in cabinetry below kitchen sink.
Water damage on Ceiling from Roof Leak

Rec Room:

Summary: Abnormal Conditions Found!

Observations:

  • Heavy water damage noted in sheetrock ceiling.
  • Increased moisture content in ceiling sheetrock
  • Increased moisture content noted in carpeting at NW corner
  • Increased moisture content noted in sheetrock walls at NW corner,

Dining room:

Summary: Abnormal Conditions Found!

Mold Under Sink

Observations:

  • Visible mold growth observed on sheetrock at exterior wall.
  • No increased moisture content noted in this area at the time of inspection.

Bathroom 1:

Summary: Abnormal Conditions Found!

Observations:

  • Heavy surfaced growth noted on ceiling
  • Increased moisture content noted in bottom 12” of sheetrock throughout.
  • Increased moisture in tile around toilet
  • Low quality exhaust fan in this area.
Improper Ventilation

Master Bedroom:

Summary: Abnormal Conditions Found!

Observations:

  • Heavy damage noted to ceiling paneling, likely secondary to poor roof venting or roof leakage.
  • No increased moisture content noted in tested building materials.
  • Obvious roof leakage into the closet.
  • Condensation based damage noted around windows.

Bathroom 2:

Summary: Abnormal Conditions Found!

Observations:

  • Stained vinyl flooring.
  • Missing panel to shower door.
  • Poor bathroom exhaust fan.
  • Heavy mold growth on sheetrock under vanity, likely secondary to leakage from the sink.
  • No increased moisture content noted in tested building materials.

Utility:

Summary: Abnormal Conditions Found!

Observations:

  • Evidence water damage bottom 12” walls
  • Old vinyl flooring in place.
  • Furnace located in this area.
  • Washing appliance hookups located in this area.
  • No increased moisture content noted in tested building materials.

Summary of recommendations:

  • Install large HEPA scrubber in the home throughout the duration of remediation work.
  • Remove and dispose of all carpet and padding throughout the home.
  • Remove all lower kitchen cabinetry.
  • Remove all sheetrock and underlying insulation from the ceiling in the Rec. Room.
  • Remove affected sheetrock and insulation from the NW corner of the Rec. Room exterior walls.
  • Remove affected sheetrock and underlying insulation from the exterior wall in the Dining Room.
  • Remove all sheetrock, fixtures, tile flooring, and underlay from Bathroom 1.
  • Remove ceiling, underlying insulation, and sheetrock from the closet in the Master bedroom.
  • Remove vanity, affected sheetrock, vinyl flooring, and underlay from Bathroom 2.
  • Remove all wall coverings and insulation to a height of 24” in the utility room.
  • Perform detailed HEPA vacuuming of the entire property to remove remaining mold spores.
  • Apply EPA-registered anti-microbial agents to the entire property via ULV fogger.
  • Install dehumidifiers and air movers to dry remaining wet building materials to below 20% moisture content.
  • Apply latex-based anti-microbial encapsulant to all remaining contaminated framing, sheathing, and subflooring.
  • Allow HEPA scrubbers to run for an additional 72 hours.
  • Perform final indoor air quality sampling.

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