Mildew On Roof Sheathing

Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.

Mildew on roof sheathing.

If your state doesn t allow you to take a sample to send to a lab recommend testing by a certified mold assessor. The presence of mold inside your home even if it s in an unused place such as the attic can cause. Appears due to this incorrect installation mold is forming on the underside of the roof sheathing. Continue spraying until you see runoff then let the chemicals sit for 15 20 minutes to soak in and begin attacking the mold.

I have very dark sheathing in my attic but it s only the plywood on one side. Start on lowest row of shingles and work your way backwards to the upper part of the roof. Mold growth provided it is not just cosmetic mold which can simply be left alone can be cleaned from wood surfaces by blasting scrubbing or even simple surface wiping depending on the surface accessibility and smoothness. This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.

Attic insulation incorrectly installed and blocking soffit vents on north side of home. Soffitt vent in front of house blocked by insulation no. This will prevent the solution from draining in your direction. Generally tearing off a roof and roof sheathing and perhaps roof framing to remove mold would not be sensible nor cost justified.

Spray the entire roof thoroughly. Mold growing on the sheathing in your attic is a serious problem that shouldn t be ignored.