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Attic mold, frost or high humidity.

A qualified roofing or insulation crew should change vents, and a specialist should handle heavy mold.

Customers put it like this

  • there is mold on the attic plywood
  • I found frost in the attic
  • the attic is really humid
  • the attic stayed damp after new insulation
Prepare this job in ForeBotFind another guide

Stop first if

  • Attic access is needed.Walk on framing only, and stop if framing moves or cracks.
  • Heavy mold is found.Keep people out and call a specialist.
  • The deck sags or feels soft from below.Keep people off the roof and call an engineer.
01

Ask on the call

5

Homeowner? These are the questions a good technician will ask you. Having the answers ready makes the first visit count.

  1. What did you see, and where in the attic?
  2. Has siding, soffit or insulation work been done lately?
  3. Do bath fans or a dryer vent into the attic?
  4. Do you run a humidifier?
  5. Is it a vented attic, or a cathedral or sealed roof?
02

Bring

6
  • Flashlight
  • Temperature and humidity meter with dew point
  • Moisture meter
  • Thermal imager
  • Tape measure
  • Phone for photos
03

Check on site

6
  1. Check intake before exhaust. Look for a clear channel at the eaves, baffles and soffit dams.
  2. Compare intake and exhaust. A vented soffit label does not give a size.
  3. Look for daylight at the ridge slot, and note crushed vent or mixed exhaust types.
  4. Note recent work that closed vents. Do not add vents over blocked intake.
  5. Check air leaks, bath fans and humidifiers.
  6. On cathedral or unvented roofs, record the layers, climate zone, and vented or unvented.
04

Keep on the record

4
  • Photos of mold or frost by location
  • Intake and exhaust areas measured
  • Temperature, humidity and dew point
  • Recent work near the eaves

General guidance for a qualified person, not a finding about any home. The person on site decides.