In the vast majority of cases the mold growth is caused by condensation.
Mold in roof rafters.
If the insulation has been affected by the mold remove it in thick trash bags and replace it with new insulation after you complete your mold remediation.
Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.
Systemic growth occurs when the roof leak causes enough moisture buildup in the attic to cause mold growth throughout the entire area.
Attic mold left unchecked can grow and lead to structural deterioration of attic sheathing and roof structural elements.
This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.
Re roofing with lining lining papers sarking roofing felt can cause severe mold growth and rot due to reduced ventilation.
Water leaks and poor ventilation leading to condensation are the main roof defects which give rise to a variety of fungi moulds and insect attacks.
Clean up the area.
There s an underlying moisture issue that needs to be resolved because mold requires moisture to grow and spread.
When removing mold from your attic your first concern should be protecting the rest of your home from it.
Water and mold problems in the attic can deteriorate wood in the roof sheathing joists etc.
Seal off the.
At some point you will probably need to go to your attic for something.
How to remove mold from your attic.
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.
Power cleaning using spray equipment such as media blasting using baking soda or dry ice is very effective for these surfaces.
Generally tearing off a roof and roof sheathing and perhaps roof framing to remove mold would not be sensible nor cost justified.
Examine the insulation along your rafters.
Cleaning mold from irregular or hard to reach wood surfaces media blasting.
Perhaps you use it for storage.
Seal off the area.
If mold needs to be removed from a roof deck through which roofing nails penetrate hand wiping is not feasible.