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Is it necessary to have steel / metal framing in a replacement vinyl window?

We're getting ready to replace our existing aluminum windows. Two different company's have told us that it is better to have a vinyl replacement window which has a steel framing in the structure so the vinyl can't buckle over time (i.e. Polybau and Window World). Is it really necessary to have this metal framing in the structure or does it depending on the size of the window? We have one very large window, 120" width x 60" height which I would find this to be very important in the long run. If it is recommended, can anyone recommend other brands with great NFRC ratings that have metal framing in the vinyl windows structure besides the two I have already listed? I am in Northern California, so please keep in mind available brands. Thanks much! One thing I failed to mention, I am not referring to the spacer between the panes of glass, but the actual vinyl framing. Thanks again. Can someone tell me why it isn't important if you say no?

Public Comments

1. no


2. I had a large and two small windows replaced in Nov. last year. They replaced with three windows of the same size, rough open around the same size you are talking about. this was a special order and all vinyl replacement windows. Nothing was said about steel framing. I also had all new frame work inside and out. Not sure about California, I live where it gets really cold. Be sure to ask how much more the cost will be. Good luck


3. No, an excellent replacement window is made of all virgin vinyl with double pane argon gas filled glass. An excellent manufacturer is NAPCO INDUSTRIES. I had these windows installed with the additional UV protection glass. Very pleased with the windows.


4. for elegance no, but for security yes.