Window wall systems are installed primarily in two ways: using concealed anchors, clips, and fasteners, or utilizing nailing flanges.
Here's a breakdown of each method:
1. Installation with Concealed Anchors, Clips, and Fasteners:
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Description: This method offers a cleaner, more modern aesthetic as the attachment hardware is hidden from view. It's often used in commercial applications and high-end residential projects where aesthetics are paramount.
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Process:
- The window wall sections are carefully positioned within the prepared opening.
- Anchors, clips, or fasteners are then used to secure the window wall to the surrounding wall framing. These are typically attached to the sides, top, and bottom of the framing.
- The hardware connects to structural elements such as wall studs, blocking (horizontal supports between studs), and headers (the beam above the opening).
- Precise alignment is crucial during this process to ensure a weathertight seal and proper operation of any operable window sections.
- Finally, trim and sealant are applied to conceal the fasteners and further weatherproof the installation.
2. Installation with Nailing Flanges:
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Description: This method is more common in residential construction and offers a simpler, more direct installation process. The nailing flange is a protruding lip around the perimeter of the window wall that is designed for direct attachment to the wall framing.
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Process:
- The window wall is positioned within the rough opening.
- The nailing flange is then directly attached to the wall studs using nails or screws.
- Proper shimming behind the flange is essential to ensure the window wall is level and square.
- Flashing tape is applied over the nailing flange to create a waterproof seal and protect the framing from water damage.
- Finally, siding or other exterior cladding is installed to cover the nailing flange, completing the installation.
Key Considerations for Both Methods:
- Accurate Measurements: Precise measurements of the opening are critical for a proper fit.
- Level and Square: Ensuring the window wall is perfectly level and square is essential for smooth operation and a weathertight seal.
- Weatherproofing: Proper flashing, sealing, and insulation are crucial to prevent water and air infiltration.
- Structural Support: The wall framing must be structurally sound and capable of supporting the weight of the window wall.
- Professional Installation: Due to the complexity and critical nature of window wall installation, it's generally recommended to hire a qualified professional.
