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Mold Growth on Joists in Crawlspace

Crawlspace Mold on Joists

Crawlspace Mold on Joists

Mold on Joists

Mold on Joists

White Mold on Joists

White Mold on Joists

Mold on Joists Only

Mold on Joists Only

Black Mold on Joists

Black Mold on Joists

Heavy White Mold Covering Many Joists

Heavy White Mold Covering Many Joists

Rot on Joists

Rot on Joists

Project Report > Inspection for Mold on Joists

Water Damage on Subfloor

Mold Growth:

  • Inspection of crawlspace revealed moderate mold growth throughout significant areas of subfloor and floor joists.
  • Significant areas of rot were noted in framing along exterior wall, the inspector was able to pass a 3.5” knife blade completely into the rim-joist along the back foundation wall.

Insulation:

  • Damaged – Insulation damaged throughout the crawlspace area and must be removed.
  • At the time of inspection all of the under floor insulation was saturated and severely damaged.

Moisture:

Mold Growth on Joists

  • Elevated moisture noted throughout significant portions of the framing and/or subflooring.  It is necessary to thoroughly dry the framing and subflooring prior to the application of encapsulant.
  • Moisture content and distribution is consistent with elevated levels of temperature and humidity for several months.  This condition is often caused by a hot water leak, but in this case is likely secondary to a faulty dryer exhaust duct.
  • The home owner had removed deck boards, and regarded sol to ensure no soil or landscaping materials contact the siding below the deck.  This condition may have contributed to localized wood rot, but was not a significant factor in the moisture and rot noted on inspection.

Leaks:

  • No obvious plumbing leaks were observed on inspection of the crawlspace.  There is a possibility that a leaking hot water line will be found once the insulation has been removed.

Vapor Barrier:

  • Damaged – Vapor barrier damaged and missing in areas, allowing excessive moisture transfer from damp soil into crawlspace framing.
  • Contaminated- Vapor barrier shows evidence of past flooding, or is extremely soiled.

Mold on Joists

Ventilation:

  • Current ventilation amount is adequate to exhaust normal amounts of humidity, but vents appeared to be limited to a single side of the home.
  • The existing ventilation will likely be sufficient for usual situations, but may be inadequate to deal with higher than normal volumes of humidity.

Ducting:

  • Dryer exhaust ducting is leaking in several places and allowing excess humidity and heat to build up in the crawlspace.

Other Contamination:

  • Moisture or carpenter ants are likely to be uncovered during the removal of insulation and affected lumber.

Trash and Debris:

  • The crawlspace is currently free from excessive amounts of trash and construction debris.