moisture on inside of storm door


Old 12-09-12, 05:24 PM
Thread Starter
Join Date: Dec 2012
Location: usa
Posts: 19
moisture on inside of storm door

What causes moisture on the glass on the inside of my storm door? There is no moisture build up on the windows in the house, but the inside of storm doors are always clouded with moisture. I live in Michigan and it is about 30 degrees outside right now.
Sponsored Links
Old 12-09-12, 06:33 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 45,128
It usually happens here when the inside door is opened and warm air is allowed to hit SINGLE pane storm door glass which due to being SINGLE pane is very cold. When warm meets cold you get condensation of moisture that's in the warm air.
Old 12-09-12, 07:00 PM
XSleeper's Avatar
Group Moderator
Join Date: Dec 2004
Location: USA
Posts: 20,531
Also the door does not have to be open to cause this. Air leakage around the perimeter of the primary door (a drafty door with poor weatherstripping) will allow warm moist air from the house to get trapped between the 2 doors, and since your storm door glass is cold it will condense.
Old 12-10-12, 04:52 AM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 39,968
Good advice. Mine does it almost immediately in really cold weather when I open the door to let the dogs out in the morning. Consider investigating how the main door is sealed.....threshold, top and sides. May need to replace worn pieces.
Old 12-11-12, 07:31 AM
Thread Starter
Join Date: Dec 2012
Location: usa
Posts: 19
Thanks & Any more adive?

Thanks for the info. You confirmed my suspicions! The space between my steel door & storm door is about 6 inches. I do have weatherstripping around the frame close to the steel door side. But apparently that is not enough, as the inside of the storm door is constantly covered with moisture. It is not just when I open the steel door. I will have to see if I can do something more to stop the warm inside air from escaping! Any other suggestions will be greatly appreciated!
Old 12-11-12, 07:54 AM
Join Date: Oct 2008
Location: New England
Posts: 9,996
It seems like just a door, but the warm air inside with cold air outside creates a natural pressure difference between inside and outside, top to bottom. In the trades we call it stack effect, but a 6' door is higher than many attics which use that same pressure to vent the unwanted hot air.

Try an incense stick or cobweb around the frame to see if you can see any leaks.

In addition, most storm windows provide a small opening at the bottom which serves as a weep hole for water and as a vent to allow a slight air exchange. If your sweep on the storm door seals too well, once the moisture gets in it cannot get out.


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes