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 Post subject: Thermally broken aluminum windows increasing?
PostPosted: Mon Mar 12, 2007 11:11 am 

Joined: Fri Mar 02, 2007 9:12 pm
Posts: 26
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It seems to me that the number of makers of thermally broken aluminum windows is increasing. Is this true and if so does anyone know the reason why?


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 Post subject:
PostPosted: Tue Mar 13, 2007 1:03 pm 

Joined: Tue Dec 20, 2005 11:27 am
Posts: 820
Location: Texas - Houston & Austin
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Thermally broken aluminum windows hold up better in extremely hot climates. Here in Houston, some vinyl windows begin to sag within 12 months of installation. (crowning, bowing, distorting)

The only trade-off, in terms of efficiency, is in U-Value, and since the SHGC is of primary concern down here, it is a minor concession.

If I lived in Chicago, Minneapolis, Kansas City, or any other city North of the Texas border, I would use vinyl with no concerns whatsoever. This is strictly a regional issue, with localized concerns.

It must also be noted, that some vinyl window issues could be eliminated, or at least minimized, with exceptional installation techniques, which are rarely utilized in Texas. Setting a vinyl window onto a crowned brick sill, will inevitably, lead to a crowned vinyl window sill and air leaks in the corners beneath the sash.


Last edited by randy on Tue Mar 13, 2007 5:49 pm, edited 1 time in total.

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 Post subject: I was close to going with a vinyl window but if fell through
PostPosted: Tue Mar 13, 2007 1:10 pm 

Joined: Fri Mar 02, 2007 9:12 pm
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Now that I have time to think about it I am leaning towards a aluminum window for the added strength. I am not that concerned about heat transfer through the frame. The biggest problem I face is heat gain through true south facing windows with nothing to block the sun.


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 Post subject:
PostPosted: Tue Mar 13, 2007 2:05 pm 

Joined: Tue Dec 20, 2005 11:27 am
Posts: 820
Location: Texas - Houston & Austin
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I would only recommend that you make sure the aluminum window has both a thermally broken frame as well as thermally broken sashes. This will keep the heat from transferring through the frame on you.


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 Post subject: How significant is thet frame for heat conduction?
PostPosted: Wed Mar 14, 2007 9:55 am 

Joined: Fri Mar 02, 2007 9:12 pm
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It seems to me the most important area will be the glass for bloocking the sun's heat. Can a frame transmit a significant amount of heat?


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 Post subject:
PostPosted: Wed Mar 14, 2007 12:21 pm 

Joined: Tue Dec 20, 2005 11:27 am
Posts: 820
Location: Texas - Houston & Austin
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Yes, the glass package is extremely important, but an aluminum window that is not thermally broken will transmit the outdoor heat straight through to the interior.


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