Forum Title: Storm Window Condensation
This might be a dead horse subject, but I can't find much information to solve my problem. This past summer I installed new Marvin CUDH clad double-hung windows, with combination storm windows, in my 1908 four-square. As the temperature has dropped here in Wisconsin, there has been condensation forming off and on on the inside of the storm windows on the upstairs windows. When it gets cold enough, it is just a coating of frost on the windows, normally forming on the upper sash of the storm, starting in the middle. The downstairs windows, which are the same clad windows with storms, do not get this condensation or frost. Since these are new windows, I am perplexed as to why there would be air loss enough to cause the condensation. When I crack the storm slightly (put in first hold-up notch, about 1 open) the condensation goes away. Any thoughts? The weep/vent holes all appear to be open. Why only on upstairs windows? And why all of them? I haven't tested, but the inside humidity is low as we rarely get any condensation on the inside of the main windows. We run forced air heat which does a good job of keeping things dry.
Category: Windows & Doors Post By: DAVID MILLER (Yuba City, CA), 01/18/2019

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