Frost on Interior Walls

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Hspirit22
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Q:

We built a ranch style home in 2012.  When it is extremely cold (below zero) and the wind blows we find areas of frost on the the interior walls @ ceiling level.  The exterior walls are 2x6, with blown in fiberglass insulation.  The attic is insulated to 48 R with blown in fiberglass.  The attic is ventilated with soffit vents and ridge cap venting.  Interior humidity runs 34-38%. We have Anderson 100 windows and do get moisture and ice built up on them as well, I get the ice on the windows but struggle with frost on the interior walls.  The general contractor and insulating contractor are puzzeled as well, but are still working with us.   Looking for ideas on identifying and correcting the problem.  We have lived in SD all our lives(55 years) in numerous houses both new and older and have never seen any frost on interior walls. Thanks for your help

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Answers

The frost is there because the surface is below the dew point and even
the freezing point of water. This most likely occurs because the there
is no insulation, just framing in the corner and thereforethre is conductive
heat loss, though there could also be some issues with cold air
infiltration due to wind.

The simplest thing to do would be to place an upright (floor-style)
halogen-lamp fixture on the floor near the area. This will create lots
of convection and radiant heat to warm the corner. There is no need
for direct or close contact.

For the sliders, you can try some incandescent holiday lights hung with
suction cups.

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