Mold on vinyl frame inside

earthygal52March 12, 2011

First of all I live in WA state and it's very damp here. These windows were replaced in 1998 and they're from a company called Alpine which is no longer in business. My ques. is why would the interior frame on the vinyl get moldy? Is it because they were not sealed properly? They were installed when it was snowing could that be why? Excuse me if I seem naive, but that's my guess. Anyone care to elaborate on this? Also, it's not happening on all the windows but still a few too many.


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Are there HVAC vents under your windows that this is occurring on? Do you have any type of blinds/shutters/shades/draperies on these windows? I ask because we had the same issue in our last house that had all vinyl windows. We had plantation style blinds (not shutters) that stayed closed the vast majority of the time. We would get mold along the base of the window where vinyl meets glass and then along the top of the bottom sash frame where it locks together with the upper sash frame. It formed especially quickly on the bathroom window. We figured the air was blowing straight up out of the vent & getting caught between the blinds & the window causing light condensation to form which would never completely evaporate thus causing the mold. We resolved the problem by putting plastic vent "deflectors" on the vents which directed the air out toward the room vs. straight up. We picked them up at Lowe's--I think they're made by the Deflect-o company and ran around $5 each. They just snap on the vent cover. Hope this helps!

Here is a link that might be useful: Deflect-o Air Deflectors

    Bookmark   March 12, 2011 at 5:27PM
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Moisture + food source + darkness (ideally) = Mildew/Mold

Make sure that any window coverings that you have over that window are open and there is air circulation at that opening.

There may be enough of a thermal bridging effect there that is allowing for condensation at the location in question or enough air infiltration around that section of the window that is also allowing for condensation to form (i.e. Dew Point temperatures).

Have you checked the interior humidity levels?

    Bookmark   March 14, 2011 at 10:14AM
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