Vinyl windows are inexpensive, durable, and remarkably energy efficient. Early vinyl windows had problems with thermal expansion. When temperatures changed, the vinyl sash would expand or contract at a very different rate from the glass. As a result, the window fit poorly, leaked, or cracked. Such problems have been on the decline, because modern vinyl is more durable and dimensionally stable than the materials that were used 15 or 20 years ago. Vinyl is also commonly used as…
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