Condensation only in certain windows
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nbogosian



Joined: 09 Mar 2014
Posts: 14
Location: texas

PostPosted: Sat Jan 09, 2016 6:44 pm    Post subject: Condensation only in certain windows Reply with quote

Hello - i have a very curious condensation issue.....condensation not so much being the issue - but the fact that it's only in one section of the home.

DETAILS:

- All traditional wood windows/single-hung/no weight pockets.
- The windows without condensation are probably mid 1900s
- The windows with condensation are late 1800s (condensates to the interior)
- The windows with condensation have more narrow muntins - maybe a 1/16 to 1/8 less bedding area than the windows with no condensation
- Glass is same thickness on both types of windows
- Both types of windows were re-glazed/all repairs at the same time, same methods, same products.
- All windows have interior shutters and no interior or exterior storms
- The home is heated...attic windows are early 1800s and no condensation
- The home has horrible spray foam insulation in walls - surrounding both the condensating and non-condensating windows
- All windows have spring bronze on sides and bottoms and bulb at meeting rail
- The condensating windows are in a part of the home that is 2 stories - condensation on both floors
- The condensating windows are all bedrooms or living spaces (not kitchens or bathrooms)
- The condensating is on all sides of the home
- All portions of home are heated (but i don't know much about hvac to determine if there's some weird building science going on with the air flow in certain parts of home and others)
- The part of the home with the condensation has more historic clapboards than new.

So the only possible conclusions i have come to is that perhaps there's something about the smaller muntins in the condensating windows (less bedding area even though the bedding is still a little over 1/16 thick like the non-condensating windows)....the other thing i've wondered is if the interior shutters which the homeowner keeps closed most of the time is causing the problem.....i did notice that the non-condensating windows had the interior shutters open today.....but i would think they would know this to be the cause if it was. plus, it's not like they're air-tight shutters...just typical louvered/adjustable type.

Sorry if this was too much info.....but i do think it's rather interesting. : ) it's also good education for future projects. Thank you for any insights...
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SashGuy



Joined: 10 Sep 2010
Posts: 147
Location: Houston

PostPosted: Mon Jan 11, 2016 3:04 pm    Post subject: Reply with quote

This is a question that is posed to me quite a bit during this time of year.

Two things to consider;

Variation in interior humidity from room to room.

Particulates or calcium deposits on the interior of the glass.


Like show and rain, water molecules are only attracted to a sub-straight.
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johnleeke
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Joined: 20 Aug 2004
Posts: 2935
Location: Portland, Maine, USA

PostPosted: Wed Jan 13, 2016 11:03 am    Post subject: Reply with quote

I would measure the relative humidity in the various interior spaces to determine if the humidity is higher in the spaces where the condensation is occurring.
If it is higher would would look for the source(s) of moisture, such as a damp basement or crawlspace, or how the HVAC system would be providing air with more moisture to that part of the building.

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nbogosian



Joined: 09 Mar 2014
Posts: 14
Location: texas

PostPosted: Sat Jan 16, 2016 8:01 pm    Post subject: Reply with quote

ok thanks a lot for the tips
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