A place to talk about the Window Industry
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what is purpose of adding steel to a vinyl window ?
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It's to prevent sagging and provide reinforcement in the vinyl frame, especially in the sash frames at the meeting rail on double-hung windows.
It's used in a lot of vinyl railing, like for decks and porches, too.
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jim r wrote:what is purpose of adding steel to a vinyl window ?
It's to prevent deflection of the center rail of the window in the wind.
Windows on Washington
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Both guys are right. Design Pressure increases and sagging correction if you have a really weak extrusion.
it is an easy way to increase strength in a cheap vinyl extrusion. it is also a way to increase DP ratings for a high quality window. Schuco comes to mind.
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while it is used quite a bit for added strength to vinyl bar. its also used to secure hardware to the vinyl. a lock under pressure would eventually pull loose if it was only screwed into the vinyl...