|
| |
Having It All! Why Some People Make the Leap -- and Others Don't
We are each beings of light. Within that light are all the colors of the rainbow -- all the aspects of God and humanity -- all the power of our natural spiritual abilities. Why do some of us open to the full spectrum of our magnificence and power? Why do ...
Thinking about Home Improvement? Then here's a checklist!
Dear friends, if you are planning to improve/renovate or refurnish your home then this article can be a very useful guide and save your lot of time. When it comes to home improvement, most people think that it's has to do with painting the house from ...
Tv News: Turn It Off And Get A Better Picture Of The World
Television news programs are just about the worst way to get news for two important reasons.1) Television itself inhibits the functioning of left brain rational analysis.2) The television media has become centralized into a few huge media ...
|
|
|
|
| |
double glazing first became a popular window choice in the 1960s, most frames were made of aluminum. Aluminum remained the most popular choice for framing double glazing windows through the mid-1980s, when it held over 60% of the market. Since the introduction of PVC window framing, the market share of aluminum framed windows has dropped steadily. As of 2003, less than 17% of windows sold were aluminum framed. There are many reasons for the drop in popularity - and still some good reasons for choosing aluminum over PVC or wood frames.
The early popularity of aluminum was based on price and convenience. Aluminum was far less expensive than wood, the only other choice for window framing in the early years of double glazing. In addition, aluminum is easily extruded in the shapes and lengths needed to frame windows of any shape or size. It's strong, durable and very close to maintenance free.
Aluminum frames do have one significant drawback, however. Aluminum is an excellent conductor of heat and cold. It's such a good conductor, in fact, that in colder temperatures, frost often forms on interior surfaces of the windows close to the aluminum joints. The end result is windows that are significantly less able to conserve heat and energy than those framed in other materials.
PVCu was introduced in the mid-80s as a choice for framing double glazing windows, and immediately began to climb in popularity. When compared with aluminum frames, PVCu was less expensive, and more energy conservative. It can't match the strength of aluminum, however, and there are security concerns with its use. In addition, the introduction of 'thermal breaks' reduces the heat conductivity (measured in U
values) of aluminum framed windows significantly. By fitting a less conductive material between the panes of the window as a sort of 'bridge' between the glass, manufacturers can bring the U value of aluminum framed double glazed windows within conservation standards.
The main selling points for aluminum window frames, then, were:
1. Strength - aluminum framed windows are far less prone to warping. The aluminum withstands weather well, needs no painting and forms strong, rigid window frames that will fit for far longer than wood frames.
2. Cost - aluminum frames are far less expensive than wood frames. They are easier to manufacture, and the material is less expensive to begin with. On the other hand, the introduction of PVC has largely negated the advantage of cost. Far lower in price, and with more efficient heating, PVC has become the material of choice for framing double glazing windows.
3. Ease of maintenance - As opposed to wood, which is subject to warping and decay and needs repainting every 3-5 years, aluminum is virtually maintenance free. It never needs painting, doesn’t rot or warp, and is rigid and strong enough to bear the load of window lintels with minimal reinforcement.
4. Security - Because of the tight fit possible with aluminum framed double glazed windows, they were - and still are - the choice where security is a paramount concern. It's very difficult to 'pop' an aluminum framed window from its frame if it's properly fitted.
About the Author
Matthew Anthony has launched the new site The Double Glazing Centre with details of local double glazing contractors in the UK.
|
|
|
|
|
|
 
Los Angeles Times |
Israeli security barrierLos Angeles TimesComments are filtered for language and registration is required. The Times makes no guarantee of comments' factual accuracy. Readers may report inappropriate comments by clicking the Report Abuse link next to a comment. Here are the full legal terms ...and more » |
|
