<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p
{mso-style-priority:99;
mso-margin-top-alt:auto;
margin-right:0cm;
mso-margin-bottom-alt:auto;
margin-left:0cm;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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 2<sup>nd</sup> 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.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 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. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> greenbuilding-bounces@lists.bioenergylists.org [mailto:greenbuilding-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>John Straube<br><b>Sent:</b> October-27-11 7:24 PM<br><b>To:</b> Reuben Deumling; Green Building<br><b>Subject:</b> Re: [Greenbuilding] passive house in NY<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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. <o:p></o:p></p><p>Sent wirelessly from my BlackBerry device on the Bell network.<o:p></o:p></p><div class=MsoNormal align=center style='text-align:center'><hr size=2 width="100%" align=center></div><div><p class=MsoNormal><b>From: </b>Reuben Deumling <9watts@gmail.com> <o:p></o:p></p></div><div><p class=MsoNormal><b>Date: </b>Thu, 27 Oct 2011 19:22:17 -0700<o:p></o:p></p></div><div><p class=MsoNormal><b>To: </b><jfstraube@gmail.com>; Green Building<greenbuilding@lists.bioenergylists.org><o:p></o:p></p></div><div><p class=MsoNormal><b>Subject: </b>Re: [Greenbuilding] passive house in NY<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><div><p class=MsoNormal>On Thu, Oct 27, 2011 at 7:16 PM, John Straube <<a href="mailto:jfstraube@gmail.com">jfstraube@gmail.com</a>> wrote:<o:p></o:p></p><p class=MsoNormal>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.<o:p></o:p></p><div><p class=MsoNormal><br>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. <br>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. <o:p></o:p></p></div></div></div></body></html>