[Greenbuilding] passive house in NY

[JOHN SALMEN]

It is an on average equation and depends on the system used, the
manufacturer and stress on the unit. Stress is size, installation factors
and exposure. Size of unit, wind exposure, etc.  We are now in the 2nd to
3rd generation of glazing failure. With the initial generation being 10-15
years. It is not insignificant and you have only to drive through an older
neighbourhood to see that the maintenance is not being done - primarily
because people cannot afford it - so I think people are currently deciding
they can no longer afford the view.

 

I do think the manufacture has improved with better sealants but the
manufacturing industry has also taken advantage of that to cut costs so...
we are hopefully looking at 20-25 years which only means that the glazing
will potentially last as long as the window housing (frame/hinge/weather
stripping).  is a huge expense for house maintenance and typically not
factored in. The housing industry is geared to that 25 year number for
substantial renovation/rebuild on all components but housing cost and
construction/financing economies are not so we are looking at houses that
essentially collapse before there is any economy in place to maintain them.


 

I've not been able to get numbers on failure for triple pane. They are more
complex for a manuf. to glaze, heavier and would assume more prone to
failure.  Most manufacturers take advantage of some decent glass options to
offer a cheap complete unit energy package that will outlast the frames they
provide but do not extend to offering a triple pane as frame sizing and
structure won't support it. 

 

I think we need to optimize and reduce glazing area - downside is that we
have to look at that much more square footage of cement plank siding painted
in such alluring colours. 

 

 

 

From: greenbuilding-bounces at lists.bioenergylists.org
[mailto:greenbuilding-bounces at lists.bioenergylists.org] On Behalf Of John
Straube
Sent: October-27-11 7:24 PM
To: Reuben Deumling; Green Building
Subject: Re: [Greenbuilding] passive house in NY

 

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. 

Sent wirelessly from my BlackBerry device on the Bell network.

  _____  

From: Reuben Deumling <9watts at gmail.com> 

Date: Thu, 27 Oct 2011 19:22:17 -0700

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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