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Thunder Chicken 10-25-2011 01:28 PM

Storm sashes for Andersen windows?
I have several Anderson double-hung windows in my house. In general they are great, but they tend to build up a lot of condensation in the cold months, which had caused some mold problems. What I would like to do is replace the insect screens with storm window sashes which would hopefully keep the inner window surface warm enough that condensation wouldn't form. I have looked all over the Andersen website and have yet to see such sashes. The local HD folks say that they don't make them. Can anyone verify whether these sashes exist, or if it is possible to get custom sashes made?

Just Bill 10-26-2011 06:48 AM

Condensation on the inside is usually due to high humidity in the house. If you run a humidifier, stop. Other things that add humidity, lots of cooking, showers without fans(teenagers), house plants, etc. Get a humidity gauge, it should read about 50% or less during the cold months. Above 50% and you will begin to have condensation.

Thunder Chicken 10-26-2011 08:51 AM

I understand the physics quite well (I teach HVAC and psychrometrics at a local college). The house is very small and showers and cooking are the only sources of humidity. We have vent fans going non-stop. In addition to this, I want to get the glass temperature up using storm sashes.

rossfingal 10-26-2011 09:55 AM

"Thunder Chicken"
Check with Andersen and see if it's advisable to use "storm windows"/
"storm sashes" with your windows.
Some say it isn't.


Windows on Wash 10-26-2011 10:50 AM

Where is the condensation happening most often?

Also, how old is the window and is it equip with Low-e/argon?

Tom Struble 10-26-2011 01:29 PM

i have actually seen storm sashes on Andersen dhungs before,they looked like they were made by Andersen and they locked into the screen groove

i have not been able to find any info on them however:no:

Thunder Chicken 10-26-2011 09:16 PM

The condensation is on the interior side of the windows - tons of it. 3 of the windows are 200 series Narrowlines, and there are two larger double hungs, all Andersen. They are probably 20 years old but in good condition otherwise. There are aftermarket aluminum frame screens that fit the small windows - if I could find similar sized storm sashes I'd be all set.

Windows on Wash 10-28-2011 10:55 AM

Where on the window location (i.e. at the meeting rail, at the stool, etc)?

If they are in locations where their are joints to accommodate movement, it is likely the condensation is being driving by air leakage.

Thunder Chicken 10-28-2011 11:05 AM

The condensation is all over the windows. There is no real air leakage. I have seen these sashes as well, but I have no idea where they got them. They are not available at the HD that sells the windows that are installed in my house. The Andersen site doesn't mention them anywhere. We need to have shades over these windows for privacy, and that is causing the windows to become chilled. If I can get storm sashes on the outside of the window I may be able to keep the inner glass surface above the dew point.

Windows on Wash 10-28-2011 11:24 AM

If you have the proper jamb depth, internal storm sashes will work as well.

You may want to just look for aftermarket storms (go insulated and seal IGU) too.

If the condensation is all over the windows, although you mentioned you are well aware of the psychrometric part of the equation, I would suggest that you still have too high a moisture content in the home.

I have seen plenty of double pane Andersen windows (i.e. non low-e) of that vintage installed without any issues of condensation.

Thunder Chicken 01-04-2012 04:25 PM

Update on the window situation: Apparently there are no storm sashes available for these windows. These are circa 1986 windows, single pane.

At the start of heating season I purchased a dehumidifier for about $200 for use in the bathroom & kitchen. We have been running it nearly non-stop. It is definitely helping knock the humidity down (and it heats the bathroom to boot, which is nice because it used to be a chilly room). However, it hasn't done much to stop the condensation on the windows.

Today I grabbed two boxes of window interior shrink wrap and cleaned and dried the windows with a blow dryer and installed the wrap. It is 20F outside and I have been boiling corned beef for a couple of hours in the kitchen (I'm fixing up a batch of hash :thumbup:) and the windows all appear to be dry so far.

I'll check the windows again tomorrow morning, but I think I'll call the situation "fixed" for ~$250 (cost of humidifier and window wrap).

Windows on Wash 01-05-2012 07:40 AM

Shrink wrapping the windows will prevent most of the migration and condensation issues so you should be fine.

Corned beef and must be Italian. :laughing:

Thunder Chicken 01-05-2012 10:54 AM

No no, "corned beef hash". Closer to Irish than Italian, but I'm neither. Home-made hash & eggs and coffee for breakfast is just a heck of way to start a cold morning and is mighty tasty.

It got down to the teens last night and everything is dry. I'll just have to make sure shrink-wrapping the windows is part of the heating season routine.

Something else I was thinking of is possibly sash replacement sometime in the future (if these size sashes are even available). The current installations are good and tight, no air leaks. The problem really is that they are old single pane glass.

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