[Greenbuilding] passive house in NY

[John Straube]

Yes IGU will fail after 25 to 30 yrs. Like shingles. Like caulking. But people decided in the 70s they would rather replace these IGUs than not see through the glass. 

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-----Original Message-----
From: Reuben Deumling <9watts at gmail.com>
Date: Thu, 27 Oct 2011 19:22:17 
To: <jfstraube at gmail.com>; Green Building<greenbuilding at lists.bioenergylists.org>
Subject: Re: [Greenbuilding] passive house in NY

On Thu, Oct 27, 2011 at 7:16 PM, John Straube <jfstraube at gmail.com> wrote:

> Yes several single panes in series fog up in cold weather, which is why we
> invented sealed units. Also, low e coatings and gas fills offer improvements
> beyond which just air filled glass can get.
>

That is actually not the concern of my window-maker friend. His concern, the
thermal benefits notwithstanding, is that the high-tech sealed units fail
after as little as 20 years and then one no longer has a clear window to
look through.
I can't speak to the fogging of two single pane sashes. I don't doubt it
could happen, but on my crummy houses original windows plus storm sashes
this has never to my knowledge occurred.

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