Frequent dampness can cause black mildew.
Black mould sash windows.
In my opinion and previous experience going through a horrible mold situation you really must replace the wood and check to see if the mold had grown in the dark damp space between the walls.
There are 2 leading contributors to black mould forming around windows or on window sills.
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If water is leaking from the outside onto the window sill then it s likely that the window frame is damaged and needs repairing or replacing altogether.
If the area is humid and condensation is often found on the window frames or sills this can lead to mould.
Typically the mold is colored and able to be seen but sometimes the mold can be the same color as the window frame making it very difficult to see.
Wood around windows even the interior easily gets damp due to insufficient caulking heavy humidity and rain or condensation that forms naturally on glass.
How to remove black mold on windows written by shermaine williams on apr 09 2010.
How to prevent black mold on windows the type of product that will work for you will also depend on the material the black mold mould is growing on and the environment.
Green mold is fairly common in households and is easier to remove than black mold which is less common but can be hazardous to your family s health and needs to be removed by a professional.
On most homes mold begins to grow at the bottom of the windows at the joint between the glass and window sash frame.
Mold inside the wall will be black and webbish looking.
Mold can also form on exterior window stools the outside sills from high outdoor humidity levels.