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Custom Shape & Size: Gable frames are usually triangular (following a symmetric roof pitch), but we can also create trapezoidal or other polygonal shapes for asymmetrical or complex roofs. Provide us the ridge height and width (span) or the roof pitch, and we’ll do the rest. There is effectively no standard size – each is bespoke. We regularly manufacture gables that span the full width of bifold door sets (4m, 5m wide or more) and up to the apex heights of 2–3m above doors. Mullions (vertical bars) can be included if the width is large to divide into sections – this can also add a design element (like creating a grid or pattern in the gable).
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Integration with Below Frames: If the gable sits atop bifold or sliding doors, we use a coupler or reinforced transom that connects the two frames. This ensures loads are transferred properly and the assembly is rigid. The gable frame often will have a bottom frame member that matches the door frame width below for a flush look. We align any mullions in the gable with door mullions if possible for aesthetic consistency. Additionally, if requested, we can design the gable so that the door heads can be removed without disturbing the gable (useful for future door maintenance) – by using independent frame sections. These nuances are part of our thoughtful design.
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Glass & Glazing Bars: Typically, we glaze gable frames with large single pieces of glass or a few panes segmented by mullions/transoms. However, some designs call for glazing bars to create a pattern (for example, a spoke design or to mimic cottage roof timbers). We can incorporate non-structural astragal bars on the glass for decoration, or true muntin bars if needed structurally. All gable glass will be toughened (safety glass) given its fixed and overhead-adjacent nature, and often laminated as well for extra safety (laminated means if it ever breaks, it stays in place). We ensure the glazing method accounts for gravity on angled glass – typically using pressure plates or additional packers as needed so glass is secure for the life of the installation.
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Thermal & Weather Considerations: Our gable frames use the same thermal break technology as our windows and doors, so you have continuous insulation. We pay special attention to sealing around the frame into the building – usually employing a foam gasket or sealant at the top against the roof, plus cavity closers at the sides. The frame is designed to shed water effectively down onto the roof flashing or onto the top of the doors below. We always recommend that a proper head flashing or over-capping is installed where the gable meets the roof line to ensure no water ingress (your builder/roofer typically handles that, but we coordinate in design). Once installed, the gable window is essentially as weather-tight as any vertical window – wind driven rain, etc., are kept out by multiple seal barriers. The interior will be dry and well-insulated.
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Installation & Access: We design the gable frame knowing it might be installed at height. Sometimes that means we deliver it in sections (for example, split down the middle) to make handling easier, then it’s bolted together on-site with provided joiners – the end result looks seamless. If it’s one big piece and accessible by machine (like telehandler or crane), we can deliver assembled. Either way, installation brackets or screw ports are provided for anchoring into the structure (roof beams or wall). We also can incorporate a 150mm upstand or flange if required at the base to sit behind roof upstand (rarely needed, usually it sits on a door frame or wall). If the gable frame is part of a new build, we often coordinate its install after roof is on but before scaffolding is removed, to aid access. For retrofits, scaffolding or inside installation might be necessary. We provide guidance on best practice to whomever is fitting, to ensure it’s safe and proper.
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