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SCARLAN
Storm Windows over Insulated Windows
SCARLAN

I was about to install storm windows in front of double pained base windows. Someone just told me that that would not be good for the base windows. Supposedly, there could be heat build-up that may cause the gas to leak from between the panes in the base windows, causing them to cloud.

Is anyone else aware of this?

Thanks.

Mastercarpentry
Re: Storm Windows over Insulated Windows
Mastercarpentry

Don't believe me- check with the manufacturer, but you do not want storms over double-pane windows (especially vinyl ones) because in the sun there will be excessive heat build-up in that space which is detrimental to the windows. Besides, if the windows were installed properly (and many aren't!) then there would be so little gained by having storms as to make them a waste of money.

Phil

ordjen
Re: Storm Windows over Insulated Windows
ordjen

I would definitely agree that storms over plastic frame windows is a really bad idea. Plastic undergoes physical distortion at relatively low temps which can be reached behind glass. As to whether wood frame windows are subject to the same distortion, I don't know. The wood frame itself is stabil, but the dual panes are held together by synthetic plastic like materials and could well be affected by high heat.

Would there be potential savings if the windows hold. Possibly. All insulation works be keeping air from moving. Another potential large dead air space would definitely add insulation value. Would the payback be worth the extra expense of good storms? I don't know, but I doubt it.

I have long been a doubter about the economic sense of replacing wooden windows in older homes for new insulated windows. The payback period is years and years of slightly reduced fuel bills. Granted, they are less maintenance and may look good, and may be more comfortable, but from a strick financial basis, they don't make sense!

I ran across this article about the wisdom of retaining older wooden windows. It kind of confirms my suspicions:
WWW.starcraftcustombuilders.com/windows.htm#VPpTQsxv4pB

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