If you have mold covering large sections of sheathing all over the attic the culprit is.
Mold mildew underside of roof.
Until you take steps to keep dew from forming on your screens the mold will keep growing on your porch.
Why black mold is bad if black mold is so common in attics and roofs is it really bad.
Mold and mildew growth.
The moist hot air inside the attic makes the perfect breeding place for the mold which quickly attaches to the underside of your roof and begins to spread.
Just as easily mold and mildew follow.
Heavy rainwater weakens and damages the roof even further.
The most common reason why mold tends to grow in these areas is inadequate ventilation of the attic.
Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.
More so than other harmful growths mildew spreads fast.
After several years of this there may be.
Wet forget outdoor cleaner only needs to be applied once a year to remove the growth.
The standing water and humidity the rapidly growing spores and wood rot these are quick and fertile breeding places for mold.
If mold spreads to the ceiling of the porch the wooden boards that support the roof can eventually rot and cave in especially if it rains a lot in your area.
This latter phenomenon occurs when the house is too humid and the warm moist air seeps into the attic where it condenses and freezes on cold attic areas.
It requires no pressure washing scrubbing or use of harsh chemicals that could damage your roof.
If you plan on painting the ceilings etc you can get a mold and mildew preventative added to paint.
It rarely lasts the full 5 years but if you clean prior to painting it ll get you pretty close.
This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.
If the mold appears in localized patches it is likely caused by leaks from windows plumbing or roofs.
In the vast majority of cases the mold growth is caused by condensation.
Moisture and water can get in to your home through the holes in your roof and down to the wood underneath.
As you can see the alga gets on your roof easily enough the wind just has to blow in the right direction and there it is.
Mildew growth is likeliest to occur in warm wet environments and often spreads on roofs with poor drainage.
Generally tearing off a roof and roof sheathing and perhaps roof framing to remove mold would not be sensible nor cost justified.
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.
Here s how to apply it.