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2021
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01
How do you actually choose between sliding windows and casement windows?
Author:
When selecting aluminum-clad windows with thermal breaks, homeowners often find it confusing to decide which opening style to choose, given the many different types available. In fact, there’s quite a bit of expertise involved in choosing the right window style. Today, our editor would like to share with you two popular options on the market: sliding windows with thermal breaks and casement windows with thermal breaks.
When selecting aluminum-clad windows with thermal breaks, homeowners often find it confusing to decide which opening style to choose, given the many different types available. In fact, there’s quite a bit of expertise involved in choosing the right window style. Today, our editor would like to share with you two of the most popular options on the market: sliding windows with thermal breaks and casement windows with thermal breaks.
First, the primary difference between break-bridge aluminum casement windows and break-bridge aluminum sliding windows lies in their compatibility with architectural styles. Thanks to their highly flexible grid configurations, break-bridge aluminum casement windows can achieve virtually any facade design. Moreover, for large-grid floor-to-ceiling windows, the opening sash occupies only a small portion of the entire window; thus, they are particularly well-suited for high-end residential developments that place great emphasis on the overall aesthetic appeal of the building. These windows perfectly align with architects’ aspirations for large grids, spacious and bright interiors, excellent transparency, and harmonious, flowing exterior designs.
Second: The wind-pressure resistance of doors and windows depends on the section modulus of the primary load-bearing members. Generally, the larger the cross-sectional area of a profile, the greater its section modulus—but this relationship is not entirely linear. For example, in typical break-bridge aluminum casement windows, although the profile cross-section is relatively small, the primary load-bearing members are often mullions or central vertical bars. These primary load-bearing members undergo corresponding reinforcement during the design process, thus ensuring good wind-pressure resistance. In contrast, break-bridge aluminum sliding windows typically have larger profile cross-sections; logically, one might expect their wind-pressure resistance to be superior. However, a more detailed stress analysis reveals that the primary load-bearing member in such windows is usually the middle sash frame, while the upper and lower mullions rely solely on pulleys to bear the horizontal wind loads. Consequently, their wind-pressure resistance is generally less than ideal.
Third: The water tightness of doors and windows depends on the sealing performance of their opening parts. Typically, break-bridge aluminum casement windows use rubber seals for sealing, while break-bridge aluminum sliding windows generally rely on brush seals. In general, rubber seals provide better sealing performance than brush seals.
Four: Comparison of Airtightness—Currently, on the market, many break-bridge aluminum casement windows use two-point locks or top-and-bottom locks at the sash opening area to achieve a tight seal, offering excellent sealing performance.
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