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Frost on inside walls and windows

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Jan 06, 2014, 12:41 PM
Frost on inside walls and windows
I noticed frost on the inside walls near the ceiling in all of the rooms that are at the back of the house. Is this poor attic ventilation or could it be something else? Also, all windows in the house have moisture and ice buildup on the inside. Granted, the past couple of days have been extremely, extremely cold. Am I worrying about nothing or is there something the inspector did not tell us? This is the first winter in our house that was built in 2007.
Jan 06, 2014, 02:20 PM
No way we could know what your insulation or ventilation needs would be from your question. Might be helpful for you to post your location or zip code?

Sounds like excess indoor humidity. First thing to reduce would be your indoor humidity. Be sure all vents, (dryer, kitchen, bathroom) are correctly vented to the outdoors (not just attic space) and ALWAYS in use when needed, so excess humidity from showers, clothes drying and cooking are not contributing to home humidity.

And if you happen to have a humidifier on your furnace...turn it off or way down to reduce the humidity inside.
Jan 06, 2014, 02:39 PM
Likely a combination of all the factors: High indoor humidity, thinner than needed insulation in typical problem areas like at the tops of outside walls and the current record low temperatures.

Cut down on the humidity, add in extra insulation or let the weather get a little warmer and this will likely go away.

Jan 06, 2014, 03:18 PM
To add a few more things, lack of air sealing.
Which is just sealing up all the holes in the top and bottom plates where wiring or plumbing was run.
Sealing up in the attic where there's any ceiling lights or fans.
Air sealing all rim joist with 2" thick blue foam and sealing that with expanding foam.
Double check that all windows are locked.
Seal around all window and door trim.

No home inspector has X ray vision or is going to ripping out sheetrock to inspect for proper insulation.

May 17, 2014, 12:20 AM
Juana Haw
I've lived in Toronto and as you know we had sharp temperature fluctuations there in winter. Frost from inside was a huge problem for me. It is true that high humidity inside the house my be the reason for frost, but some installers do not provide proper insulation and it also may be the reason for such unpleasant things. I have turned to these doors and windows installers to solve this problem. I know that they have offices throughout the country. May be you'll find them at your location.

This message has been edited. Last edited by: Juana Haw,