Mold On Roof Sheeting

Attic insulation incorrectly installed and blocking soffit vents on north side of home.

Mold on roof sheeting.

Is a structural sheathing solution that is durable cost effective and easy to install. In terms of mold resistance it is one of if not the best product on the market. One puzzling aspect of the phenomenon is that the mold is found in well built homes that comply with all relevant building codes. Brown mold on plywood roof sheathing in an exposed to leaks or moisture problems is one of the most common molds spotted by home inspectors.

If your state doesn t allow you to take a sample to send to a lab recommend testing by a certified mold assessor. Organic materials to feed off moisture warmth and darkness. A 10 x 10 area of plywood has been removed to provide air into this area. Mold can form but often it is.

Mold requires a few key elements in order to grow and thrive. The black mold is on the first 3 truss panels. The effects of mold exposure depend on your health and the amount of mold you re exposed to. This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.

Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest. Spray the entire roof thoroughly. Mold that grows on the underside of roof sheathing due to ideal mold growth conditions being present. Increasingly homeowners in the pacific northwest are noticing mold on the underside of their roof sheathing.

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. Skips a few trusses and reappears on the next panel or two. The roof has baffles at alternating thusses soffit and ridge vents.

After several years of this there may be dark rings around protruding roofing nails and larger dark spots or areas on the roof sheathing and or exterior gable walls. Barricade thermo brace s i b. If you want to prevent moisture vapor from causing issues like wood rot and mold you need mold resistant sheathing. Mold must be removed from attic sheathing because the spores can cause serious health problems.

Start on lowest row of shingles and work your way backwards to the upper part of the roof. In the vast majority of cases the mold growth is caused by condensation. Often in attics we also find cladosporium sphaerospermum or aureobasidium pullulans which looks about the same or a little darker on plywood or framing.