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Kitchen Mold Problems and Solutions

mold under kitchen sink

Mold Beneath the Kitchen Sink

Mold growth beneath a kitchen sink is fairly common.  Numerous potential water sources exist (hot and cold supplies lines, drain line, garbage disposal, the supply line to dishwasher, etc.)  Major leaks are identified and remedied quickly.  Water spilling out on your kitchen floor is tough to miss.  Slow leaks often go unattended for months because the cabinet is typically used to store cleaning materials, garbage can, etc.  These items block the view of the cabinet bottom and sheetrock wall.

Mold growth beneath the sink doesn’t necessarily indicate an active leak.  Because mold growth doesn’t fade with time, old growth can look very similar to active growth.  Thankfully, this is quickly determined by using a moisture meter.  The moisture meter in this image is reading <15%, which indicates a dry surface.  Remediation is still necessary, but a plumber won’t be necessary.

water damage under kitchen sink

Mold growth from an old leak.

dishwasher mold

Mold growth from leaky dishwasher supply line.

Project Report > Kitchen Mold

Kitchen / Back Entryway

Mold Under Kitchen Sink

Mold Under Kitchen Sink

  • All lower cabinets in kitchen area are heavily damaged by mold and exposure to moisture.  Moldy drywall found along North facing exterior wall of kitchen.  Elevated moisture levels were found in any drywall exhibiting visible mold growth in kitchen.
  • Moldy drywall extended behind all cabinetry in kitchen and extends down hallway to back door.
  • Source of mold appears to be from the hot water tank as the greatest amount of mold growth was found to be here.
  • Elevated moisture levels noted in flooring under vinyl linoleum.
  • All cabinets show excessive damage due to high levels of humidity and rodent contamination.
  • Window sashes are swollen due to high relative humidity levels.
  • Excessive amount of mold and insects around window frames.
  • Furnace is excessively dirty and heavily contaminated from dirt, rodents and other debris.  It is unknown if the furnace is operational at this time.
  • All damaged window sashes and trim should be removed & replaced.
  • Ventilation hood should be removed and replaced due to heavy grease and oil deposits and general neglect.
  • All remaining walls and ceiling are to be wiped down with an EPA registered antimicrobial spray.

Master Bedroom

Water Damage wall mold

Water Damage to Floor & Wall of Master Closet

HVAC Ducts Filled with Debris 

  • Heavy debris found inside HVAC registers.
  • All windows have mold growth and significant insect deposits.
  • Walls are coated with grime and possible nicotine stains.
  • Master closet has visible mold growth along the bottom edges of the walls.

Master Bath

Mold under cabinets

Master Bathroom Cabinets Destroyed

Water Damage To Floor of Master Bathroom

  • Significant water damage noted to vanity cabinet.
  • Failure of sealant around base of shower surround.
  • Water damage noted under vinyl flooring.
  • All walls and ceiling are coated with grime and possible nicotine stains.
  • Recommend removal of shower surround  and underlying sheetrock.
  • Bathtub may need removal depending on water damage found between walls and under vinyl flooring.
  • Recommend removal of all vinyl flooring and any water damaged underlayment / subflooring.
  • Recommend removal and disposal of vanity sink.

Living Room

  • Little to no water damage noted in flooring or walls.
  • Walls and ceiling were coated in grime and possible nicotine stains.
  • HVAC registers were filled with debris.
  • Front entrance retained some vinyl flooring which was severely damaged.
  • Windows had holes drilled in frames for lift handles and revealed rust stains from exposure to high relative humidity.
  • Vinyl flooring at front door should be removed.
  • Windows should be replaced for cosmetic purposes.

Back Family Room  

Cracked Window

  • Back, West facing window had a significant crack in the exterior pane and should be replaced.
  • Lift handles were installed in window frames and rusting was present around the hardware.
  • HVAC registers contained debris.
  • All walls, floors and ceiling were covered and grime.
  • Replace cracked window.
  • Recommend replacing remaining windows for cosmetic purposes.

West Bedroom

  • Some minor swelling of window sash due to excessive relative humidity inside room.
  • No visible mold growth noted but walls and flooring were covered in grime.

East Bedroom

  • Hole found in door to bedroom.
  • Walls and floor were covered in grime.
  • Debris found in HVAC register.
  • Replace entry door.

Hall Bath

cabinet water damage

Hall Bathroom – Damage to Floors, Cabinets, & Tub

  • Water damage noted to flooring in front of tub.
  • Bathtub was extremely dirty and may be salvageable.
  • Vinyl flooring is extremely dirty and damaged.
  • Vanity cabinet shows minor damage but is heavily stained and likely needs replacement due to cosmetic damage.
  • Walls, floors and ceiling were covered in grime and possible nicotine stains.


Excessive Moisture Registered in Many Locations of Insulation in Crawlspace

  • Numerous locations where the belly wrap was bulging down as a result of wet insulation.
  • Moisture probes were inserted into the belly wrap in these locations to confirm the presence of wet insulation.
  • Vapor barrier was in good shape throughout crawlspace.
  • HVAC trunk line from furnace was laying on the ground and appeared to have water damage.
  • Due to evident rodent activity found inside the home, it is highly probable that much of the under-floor insulation is contaminated with rodent feces and urine.
  • Recommend all belly wrap and insulation be removed from area due to both water damage and rodent contamination.
  • Inspect the entire underbelly of the home for damage to subflooring from water damage.
  • Remove and replace all HVAC ducting.


Water Damage

Water Damaged Window Trim Around Exterior of Home

  • Several places were noted where window trim revealed signs of swelling due to moisture intrusion.
  • Lower skirt had been removed for access to under the home.
  • Remove and replace any water damaged window trim.
  • Perform regular maintenance to exterior with regards to paint, caulking and cleaning.
  • Replace lower skirt around building once all crawlspace work has been completed. `

Project Report > Inspection for Mold Under a Kitchen Sink

Work #: 103029

General Information

  • The kitchen staff had been concerned about the health effects of mold subsequent to a leaking sink.


  • Leaks from the sink have caused some water damage to the underlying wooden platform.
  • Opening access panel in platform revealed a crawlspace with clearance no greater than 6”.
  • Strong odors were noted emanating from the crawlspace.
  • It appears that waste water had dumped in to the crawlspace causing mold growth on the framing and leaving a pool of water and organic materials.  (this material likely supports significant bacteria and fungal growth and is a source of the odors).
  • Increased moisture content was noted in the affected platform, surrounding framing, and below the associated vinyl flooring.
  • A large chase is present above the cook-top exhaust hood which may allow for gases and particulate materials from the second floor to enter the kitchen.
  • RH: 39.9%     Temp: 64.3F     CO2 = 372ppm     CO = 0ppm
Mold under Sink cabinets

Mold under Sink


  • Install missing sections of subflooring.
  • Rebuild the platform to similar size and shape with all pressure-treated lumber.
  • Cover new platform and new subflooring with contractor-grade black ceramic tile.
  • Replace all appliances and reconnect plumbing.

 Dry Storage

  • The tenants report that there had been water intrusion from both leaks in the ceiling and through a crack in the exterior wall.
  • Water that came through the ceiling likely passed through bird droppings and carcasses before entering the occupied space.
  • The laminate flooring in this area has been warped and deformed due to water intrusion.
  • This area covers the entire second story of the building.
  • Massive quantities of avian feces and nesting materials were noted (estimated up to 4” thickness in some areas)
  • Many dead bird carcasses were observed.
  • 2 white PVC ducts were noted venting into this area, and are assumed to be exhaust ducting from a high-efficiency combustion appliance.
  • The area was deemed unsafe for inspection and full evaluation could not be made.
  • There appears to be several areas of connectivity between this area and the occupied space below.
  • Under no circumstances should anyone enter this are without the appropriate training and personal protective equipment.
  • The PVC vent tubes must be immediately evaluated and if they are exhaust ducts for combustion appliances, they must be fully routed to the exterior immediately.
  • The area should be fully inspected and remediated by trained professionals.

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